662 lines
20 KiB
TypeScript
662 lines
20 KiB
TypeScript
import * as ffmpeg from 'fluent-ffmpeg'
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import { readFile, remove, writeFile } from 'fs-extra'
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import { dirname, join } from 'path'
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import { FFMPEG_NICE, VIDEO_LIVE, VIDEO_TRANSCODING_ENCODERS, VIDEO_TRANSCODING_FPS } from '@server/initializers/constants'
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import { VideoResolution } from '../../shared/models/videos'
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import { checkFFmpegEncoders } from '../initializers/checker-before-init'
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import { CONFIG } from '../initializers/config'
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import { getAudioStream, getClosestFramerateStandard, getVideoFileFPS } from './ffprobe-utils'
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import { processImage } from './image-utils'
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import { logger } from './logger'
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/**
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*
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* Functions that run transcoding/muxing ffmpeg processes
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* Mainly called by lib/video-transcoding.ts and lib/live-manager.ts
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*
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*/
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// ---------------------------------------------------------------------------
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// Encoder options
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// ---------------------------------------------------------------------------
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// Options builders
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export type EncoderOptionsBuilder = (params: {
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input: string
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resolution: VideoResolution
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fps?: number
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streamNum?: number
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}) => Promise<EncoderOptions> | EncoderOptions
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// Options types
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export interface EncoderOptions {
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copy?: boolean
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outputOptions: string[]
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}
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// All our encoders
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export interface EncoderProfile <T> {
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[ profile: string ]: T
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default: T
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}
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export type AvailableEncoders = {
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[ id in 'live' | 'vod' ]: {
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[ encoder in 'libx264' | 'aac' | 'libfdk_aac' ]?: EncoderProfile<EncoderOptionsBuilder>
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}
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}
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// ---------------------------------------------------------------------------
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// Image manipulation
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// ---------------------------------------------------------------------------
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function convertWebPToJPG (path: string, destination: string): Promise<void> {
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const command = ffmpeg(path)
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.output(destination)
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return runCommand(command)
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}
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function processGIF (
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path: string,
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destination: string,
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newSize: { width: number, height: number },
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keepOriginal = false
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): Promise<void> {
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return new Promise<void>(async (res, rej) => {
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if (path === destination) {
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throw new Error('FFmpeg needs an input path different that the output path.')
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}
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logger.debug('Processing gif %s to %s.', path, destination)
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try {
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const command = ffmpeg(path)
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.fps(20)
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.size(`${newSize.width}x${newSize.height}`)
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.output(destination)
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command.on('error', (err, stdout, stderr) => {
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logger.error('Error in ffmpeg gif resizing process.', { stdout, stderr })
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return rej(err)
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})
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.on('end', async () => {
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if (keepOriginal !== true) await remove(path)
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res()
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})
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.run()
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} catch (err) {
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return rej(err)
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}
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})
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}
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async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
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const pendingImageName = 'pending-' + imageName
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const options = {
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filename: pendingImageName,
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count: 1,
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folder
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}
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const pendingImagePath = join(folder, pendingImageName)
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try {
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await new Promise<string>((res, rej) => {
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ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL })
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.on('error', rej)
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.on('end', () => res(imageName))
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.thumbnail(options)
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})
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const destination = join(folder, imageName)
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await processImage(pendingImagePath, destination, size)
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} catch (err) {
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logger.error('Cannot generate image from video %s.', fromPath, { err })
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try {
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await remove(pendingImagePath)
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} catch (err) {
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logger.debug('Cannot remove pending image path after generation error.', { err })
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}
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}
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}
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// ---------------------------------------------------------------------------
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// Transcode meta function
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// ---------------------------------------------------------------------------
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type TranscodeOptionsType = 'hls' | 'quick-transcode' | 'video' | 'merge-audio' | 'only-audio'
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interface BaseTranscodeOptions {
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type: TranscodeOptionsType
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inputPath: string
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outputPath: string
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availableEncoders: AvailableEncoders
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profile: string
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resolution: VideoResolution
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isPortraitMode?: boolean
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}
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interface HLSTranscodeOptions extends BaseTranscodeOptions {
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type: 'hls'
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copyCodecs: boolean
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hlsPlaylist: {
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videoFilename: string
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}
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}
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interface QuickTranscodeOptions extends BaseTranscodeOptions {
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type: 'quick-transcode'
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}
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interface VideoTranscodeOptions extends BaseTranscodeOptions {
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type: 'video'
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}
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interface MergeAudioTranscodeOptions extends BaseTranscodeOptions {
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type: 'merge-audio'
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audioPath: string
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}
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interface OnlyAudioTranscodeOptions extends BaseTranscodeOptions {
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type: 'only-audio'
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}
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type TranscodeOptions =
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HLSTranscodeOptions
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| VideoTranscodeOptions
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| MergeAudioTranscodeOptions
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| OnlyAudioTranscodeOptions
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| QuickTranscodeOptions
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const builders: {
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[ type in TranscodeOptionsType ]: (c: ffmpeg.FfmpegCommand, o?: TranscodeOptions) => Promise<ffmpeg.FfmpegCommand> | ffmpeg.FfmpegCommand
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} = {
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'quick-transcode': buildQuickTranscodeCommand,
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'hls': buildHLSVODCommand,
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'merge-audio': buildAudioMergeCommand,
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'only-audio': buildOnlyAudioCommand,
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'video': buildx264VODCommand
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}
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async function transcode (options: TranscodeOptions) {
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logger.debug('Will run transcode.', { options })
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let command = getFFmpeg(options.inputPath)
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.output(options.outputPath)
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command = await builders[options.type](command, options)
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await runCommand(command)
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await fixHLSPlaylistIfNeeded(options)
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}
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// ---------------------------------------------------------------------------
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// Live muxing/transcoding functions
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// ---------------------------------------------------------------------------
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async function getLiveTranscodingCommand (options: {
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rtmpUrl: string
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outPath: string
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resolutions: number[]
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fps: number
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deleteSegments: boolean
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availableEncoders: AvailableEncoders
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profile: string
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}) {
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const { rtmpUrl, outPath, resolutions, fps, deleteSegments, availableEncoders, profile } = options
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const input = rtmpUrl
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const command = getFFmpeg(input)
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command.inputOption('-fflags nobuffer')
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const varStreamMap: string[] = []
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command.complexFilter([
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{
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inputs: '[v:0]',
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filter: 'split',
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options: resolutions.length,
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outputs: resolutions.map(r => `vtemp${r}`)
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},
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...resolutions.map(r => ({
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inputs: `vtemp${r}`,
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filter: 'scale',
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options: `w=-2:h=${r}`,
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outputs: `vout${r}`
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}))
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])
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command.outputOption('-preset superfast')
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for (let i = 0; i < resolutions.length; i++) {
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const resolution = resolutions[i]
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const baseEncoderBuilderParams = { input, availableEncoders, profile, fps, resolution, streamNum: i, videoType: 'live' as 'live' }
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{
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const builderResult = await getEncoderBuilderResult(Object.assign({}, baseEncoderBuilderParams, { streamType: 'VIDEO' }))
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if (!builderResult) {
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throw new Error('No available live video encoder found')
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}
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command.outputOption(`-map [vout${resolution}]`)
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addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps, streamNum: i })
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logger.debug('Apply ffmpeg live video params from %s.', builderResult.encoder, builderResult)
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command.outputOption(`${buildStreamSuffix('-c:v', i)} ${builderResult.encoder}`)
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command.addOutputOptions(builderResult.result.outputOptions)
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}
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{
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const builderResult = await getEncoderBuilderResult(Object.assign({}, baseEncoderBuilderParams, { streamType: 'AUDIO' }))
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if (!builderResult) {
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throw new Error('No available live audio encoder found')
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}
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command.outputOption('-map a:0')
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addDefaultEncoderParams({ command, encoder: builderResult.encoder, fps, streamNum: i })
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logger.debug('Apply ffmpeg live audio params from %s.', builderResult.encoder, builderResult)
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command.outputOption(`${buildStreamSuffix('-c:a', i)} ${builderResult.encoder}`)
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command.addOutputOptions(builderResult.result.outputOptions)
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}
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varStreamMap.push(`v:${i},a:${i}`)
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}
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addDefaultLiveHLSParams(command, outPath, deleteSegments)
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command.outputOption('-var_stream_map', varStreamMap.join(' '))
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return command
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}
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function getLiveMuxingCommand (rtmpUrl: string, outPath: string, deleteSegments: boolean) {
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const command = getFFmpeg(rtmpUrl)
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command.inputOption('-fflags nobuffer')
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command.outputOption('-c:v copy')
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command.outputOption('-c:a copy')
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command.outputOption('-map 0:a?')
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command.outputOption('-map 0:v?')
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addDefaultLiveHLSParams(command, outPath, deleteSegments)
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return command
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}
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async function hlsPlaylistToFragmentedMP4 (hlsDirectory: string, segmentFiles: string[], outputPath: string) {
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const concatFilePath = join(hlsDirectory, 'concat.txt')
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function cleaner () {
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remove(concatFilePath)
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.catch(err => logger.error('Cannot remove concat file in %s.', hlsDirectory, { err }))
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}
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// First concat the ts files to a mp4 file
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const content = segmentFiles.map(f => 'file ' + f)
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.join('\n')
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await writeFile(concatFilePath, content + '\n')
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const command = getFFmpeg(concatFilePath)
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command.inputOption('-safe 0')
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command.inputOption('-f concat')
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command.outputOption('-c:v copy')
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command.audioFilter('aresample=async=1:first_pts=0')
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command.output(outputPath)
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return runCommand(command, cleaner)
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}
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function buildStreamSuffix (base: string, streamNum?: number) {
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if (streamNum !== undefined) {
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return `${base}:${streamNum}`
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}
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return base
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}
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// ---------------------------------------------------------------------------
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export {
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getLiveTranscodingCommand,
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getLiveMuxingCommand,
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buildStreamSuffix,
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convertWebPToJPG,
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processGIF,
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generateImageFromVideoFile,
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TranscodeOptions,
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TranscodeOptionsType,
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transcode,
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hlsPlaylistToFragmentedMP4
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}
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// ---------------------------------------------------------------------------
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// ---------------------------------------------------------------------------
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// Default options
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// ---------------------------------------------------------------------------
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function addDefaultEncoderParams (options: {
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command: ffmpeg.FfmpegCommand
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encoder: 'libx264' | string
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streamNum?: number
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fps?: number
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}) {
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const { command, encoder, fps, streamNum } = options
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if (encoder === 'libx264') {
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// 3.1 is the minimal resource allocation for our highest supported resolution
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command.outputOption('-level 3.1')
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// NOTE: b-strategy 1 - heuristic algorithm, 16 is optimal B-frames for it
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.outputOption('-b_strategy 1')
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// NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
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.outputOption('-bf 16')
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// allows import of source material with incompatible pixel formats (e.g. MJPEG video)
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.outputOption(buildStreamSuffix('-pix_fmt', streamNum) + ' yuv420p')
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// strip all metadata
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.outputOption('-map_metadata -1')
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// avoid issues when transcoding some files: https://trac.ffmpeg.org/ticket/6375
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.outputOption(buildStreamSuffix('-max_muxing_queue_size', streamNum) + ' 1024')
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if (fps) {
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// Keyframe interval of 2 seconds for faster seeking and resolution switching.
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// https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html
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// https://superuser.com/a/908325
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command.outputOption('-g ' + (fps * 2))
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}
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}
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}
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function addDefaultLiveHLSParams (command: ffmpeg.FfmpegCommand, outPath: string, deleteSegments: boolean) {
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command.outputOption('-hls_time ' + VIDEO_LIVE.SEGMENT_TIME_SECONDS)
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command.outputOption('-hls_list_size ' + VIDEO_LIVE.SEGMENTS_LIST_SIZE)
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if (deleteSegments === true) {
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command.outputOption('-hls_flags delete_segments')
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}
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command.outputOption(`-hls_segment_filename ${join(outPath, '%v-%06d.ts')}`)
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command.outputOption('-master_pl_name master.m3u8')
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command.outputOption(`-f hls`)
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command.output(join(outPath, '%v.m3u8'))
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}
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// ---------------------------------------------------------------------------
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// Transcode VOD command builders
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// ---------------------------------------------------------------------------
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async function buildx264VODCommand (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
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let fps = await getVideoFileFPS(options.inputPath)
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if (
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// On small/medium resolutions, limit FPS
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options.resolution !== undefined &&
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options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN &&
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fps > VIDEO_TRANSCODING_FPS.AVERAGE
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) {
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// Get closest standard framerate by modulo: downsampling has to be done to a divisor of the nominal fps value
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fps = getClosestFramerateStandard(fps, 'STANDARD')
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}
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command = await presetVideo(command, options.inputPath, options, fps)
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if (options.resolution !== undefined) {
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// '?x720' or '720x?' for example
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const size = options.isPortraitMode === true
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? `${options.resolution}x?`
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: `?x${options.resolution}`
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command = command.size(size)
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}
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// Hard FPS limits
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if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = getClosestFramerateStandard(fps, 'HD_STANDARD')
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else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN
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command = command.withFPS(fps)
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return command
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}
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async function buildAudioMergeCommand (command: ffmpeg.FfmpegCommand, options: MergeAudioTranscodeOptions) {
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command = command.loop(undefined)
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command = await presetVideo(command, options.audioPath, options)
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/*
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MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html
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Our target situation is closer to a livestream than a stream,
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since we want to reduce as much a possible the encoding burden,
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although not to the point of a livestream where there is a hard
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constraint on the frames per second to be encoded.
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*/
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command.outputOption('-preset:v veryfast')
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command = command.input(options.audioPath)
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.videoFilter('scale=trunc(iw/2)*2:trunc(ih/2)*2') // Avoid "height not divisible by 2" error
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.outputOption('-tune stillimage')
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.outputOption('-shortest')
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return command
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}
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function buildOnlyAudioCommand (command: ffmpeg.FfmpegCommand, _options: OnlyAudioTranscodeOptions) {
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command = presetOnlyAudio(command)
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return command
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}
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function buildQuickTranscodeCommand (command: ffmpeg.FfmpegCommand) {
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command = presetCopy(command)
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command = command.outputOption('-map_metadata -1') // strip all metadata
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.outputOption('-movflags faststart')
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return command
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}
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async function buildHLSVODCommand (command: ffmpeg.FfmpegCommand, options: HLSTranscodeOptions) {
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const videoPath = getHLSVideoPath(options)
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if (options.copyCodecs) command = presetCopy(command)
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else if (options.resolution === VideoResolution.H_NOVIDEO) command = presetOnlyAudio(command)
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else command = await buildx264VODCommand(command, options)
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command = command.outputOption('-hls_time 4')
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.outputOption('-hls_list_size 0')
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.outputOption('-hls_playlist_type vod')
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.outputOption('-hls_segment_filename ' + videoPath)
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.outputOption('-hls_segment_type fmp4')
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.outputOption('-f hls')
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.outputOption('-hls_flags single_file')
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return command
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}
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async function fixHLSPlaylistIfNeeded (options: TranscodeOptions) {
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if (options.type !== 'hls') return
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const fileContent = await readFile(options.outputPath)
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const videoFileName = options.hlsPlaylist.videoFilename
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const videoFilePath = getHLSVideoPath(options)
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// Fix wrong mapping with some ffmpeg versions
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const newContent = fileContent.toString()
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.replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`)
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await writeFile(options.outputPath, newContent)
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}
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function getHLSVideoPath (options: HLSTranscodeOptions) {
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return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}`
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}
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// ---------------------------------------------------------------------------
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// Transcoding presets
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// ---------------------------------------------------------------------------
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async function getEncoderBuilderResult (options: {
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streamType: string
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input: string
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availableEncoders: AvailableEncoders
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profile: string
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videoType: 'vod' | 'live'
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resolution: number
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fps?: number
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streamNum?: number
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}) {
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const { availableEncoders, input, profile, resolution, streamType, fps, streamNum, videoType } = options
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const encodersToTry: string[] = VIDEO_TRANSCODING_ENCODERS[streamType]
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for (const encoder of encodersToTry) {
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if (!(await checkFFmpegEncoders()).get(encoder) || !availableEncoders[videoType][encoder]) continue
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const builderProfiles: EncoderProfile<EncoderOptionsBuilder> = availableEncoders[videoType][encoder]
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let builder = builderProfiles[profile]
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|
if (!builder) {
|
|
logger.debug('Profile %s for encoder %s not available. Fallback to default.', profile, encoder)
|
|
builder = builderProfiles.default
|
|
}
|
|
|
|
const result = await builder({ input, resolution: resolution, fps, streamNum })
|
|
|
|
return {
|
|
result,
|
|
|
|
// If we don't have output options, then copy the input stream
|
|
encoder: result.copy === true
|
|
? 'copy'
|
|
: encoder
|
|
}
|
|
}
|
|
|
|
return null
|
|
}
|
|
|
|
async function presetVideo (
|
|
command: ffmpeg.FfmpegCommand,
|
|
input: string,
|
|
transcodeOptions: TranscodeOptions,
|
|
fps?: number
|
|
) {
|
|
let localCommand = command
|
|
.format('mp4')
|
|
.outputOption('-movflags faststart')
|
|
|
|
// Audio encoder
|
|
const parsedAudio = await getAudioStream(input)
|
|
|
|
let streamsToProcess = [ 'AUDIO', 'VIDEO' ]
|
|
|
|
if (!parsedAudio.audioStream) {
|
|
localCommand = localCommand.noAudio()
|
|
streamsToProcess = [ 'VIDEO' ]
|
|
}
|
|
|
|
for (const streamType of streamsToProcess) {
|
|
const { profile, resolution, availableEncoders } = transcodeOptions
|
|
|
|
const builderResult = await getEncoderBuilderResult({
|
|
streamType,
|
|
input,
|
|
resolution,
|
|
availableEncoders,
|
|
profile,
|
|
fps,
|
|
videoType: 'vod' as 'vod'
|
|
})
|
|
|
|
if (!builderResult) {
|
|
throw new Error('No available encoder found for stream ' + streamType)
|
|
}
|
|
|
|
logger.debug('Apply ffmpeg params from %s.', builderResult.encoder, builderResult)
|
|
|
|
if (streamType === 'VIDEO') {
|
|
localCommand.videoCodec(builderResult.encoder)
|
|
} else if (streamType === 'AUDIO') {
|
|
localCommand.audioCodec(builderResult.encoder)
|
|
}
|
|
|
|
command.addOutputOptions(builderResult.result.outputOptions)
|
|
addDefaultEncoderParams({ command: localCommand, encoder: builderResult.encoder, fps })
|
|
}
|
|
|
|
return localCommand
|
|
}
|
|
|
|
function presetCopy (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand {
|
|
return command
|
|
.format('mp4')
|
|
.videoCodec('copy')
|
|
.audioCodec('copy')
|
|
}
|
|
|
|
function presetOnlyAudio (command: ffmpeg.FfmpegCommand): ffmpeg.FfmpegCommand {
|
|
return command
|
|
.format('mp4')
|
|
.audioCodec('copy')
|
|
.noVideo()
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Utils
|
|
// ---------------------------------------------------------------------------
|
|
|
|
function getFFmpeg (input: string) {
|
|
// We set cwd explicitly because ffmpeg appears to create temporary files when trancoding which fails in read-only file systems
|
|
const command = ffmpeg(input, { niceness: FFMPEG_NICE.TRANSCODING, cwd: CONFIG.STORAGE.TMP_DIR })
|
|
|
|
if (CONFIG.TRANSCODING.THREADS > 0) {
|
|
// If we don't set any threads ffmpeg will chose automatically
|
|
command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
|
|
}
|
|
|
|
return command
|
|
}
|
|
|
|
async function runCommand (command: ffmpeg.FfmpegCommand, onEnd?: Function) {
|
|
return new Promise<void>((res, rej) => {
|
|
command.on('error', (err, stdout, stderr) => {
|
|
if (onEnd) onEnd()
|
|
|
|
logger.error('Error in transcoding job.', { stdout, stderr })
|
|
rej(err)
|
|
})
|
|
|
|
command.on('end', () => {
|
|
if (onEnd) onEnd()
|
|
|
|
res()
|
|
})
|
|
|
|
command.run()
|
|
})
|
|
}
|