diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 407907e53..baddba758 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -46,6 +46,7 @@ jobs:
       PGHOST: localhost
       NODE_PENDING_JOB_WAIT: 250
       ENABLE_OBJECT_STORAGE_TESTS: true
+      ENABLE_FFMPEG_THUMBNAIL_PIXEL_COMPARISON_TESTS: true
       OBJECT_STORAGE_SCALEWAY_KEY_ID: ${{ secrets.OBJECT_STORAGE_SCALEWAY_KEY_ID }}
       OBJECT_STORAGE_SCALEWAY_ACCESS_KEY: ${{ secrets.OBJECT_STORAGE_SCALEWAY_ACCESS_KEY }}
       YOUTUBE_DL_DOWNLOAD_BEARER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/server/controllers/api/videos/upload.ts b/server/controllers/api/videos/upload.ts
index 86ab4591e..6c471ff90 100644
--- a/server/controllers/api/videos/upload.ts
+++ b/server/controllers/api/videos/upload.ts
@@ -111,7 +111,7 @@ async function addVideoLegacy (req: express.Request, res: express.Response) {
 async function addVideoResumable (req: express.Request, res: express.Response) {
   const videoPhysicalFile = res.locals.videoFileResumable
   const videoInfo = videoPhysicalFile.metadata
-  const files = { previewfile: videoInfo.previewfile }
+  const files = { previewfile: videoInfo.previewfile, thumbnailfile: videoInfo.thumbnailfile }
 
   const response = await addVideo({ req, res, videoPhysicalFile, videoInfo, files })
   await Redis.Instance.setUploadSession(req.query.upload_id, response)
diff --git a/server/lib/object-storage/pre-signed-urls.ts b/server/lib/object-storage/pre-signed-urls.ts
new file mode 100644
index 000000000..46a0750a1
--- /dev/null
+++ b/server/lib/object-storage/pre-signed-urls.ts
@@ -0,0 +1,41 @@
+import { GetObjectCommand } from '@aws-sdk/client-s3'
+import { getSignedUrl } from '@aws-sdk/s3-request-presigner'
+import { CONFIG } from '@server/initializers/config'
+import { MStreamingPlaylistVideo, MVideoFile } from '@server/types/models'
+import { generateHLSObjectStorageKey, generateWebTorrentObjectStorageKey } from './keys'
+import { buildKey, getClient } from './shared'
+
+export function generateWebVideoPresignedUrl (options: {
+  file: MVideoFile
+  downloadFilename: string
+}) {
+  const { file, downloadFilename } = options
+
+  const key = generateWebTorrentObjectStorageKey(file.filename)
+
+  const command = new GetObjectCommand({
+    Bucket: CONFIG.OBJECT_STORAGE.VIDEOS.BUCKET_NAME,
+    Key: buildKey(key, CONFIG.OBJECT_STORAGE.VIDEOS),
+    ResponseContentDisposition: `attachment; filename=${downloadFilename}`
+  })
+
+  return getSignedUrl(getClient(), command, { expiresIn: 3600 * 24 })
+}
+
+export function generateHLSFilePresignedUrl (options: {
+  streamingPlaylist: MStreamingPlaylistVideo
+  file: MVideoFile
+  downloadFilename: string
+}) {
+  const { streamingPlaylist, file, downloadFilename } = options
+
+  const key = generateHLSObjectStorageKey(streamingPlaylist, file.filename)
+
+  const command = new GetObjectCommand({
+    Bucket: CONFIG.OBJECT_STORAGE.STREAMING_PLAYLISTS.BUCKET_NAME,
+    Key: buildKey(key, CONFIG.OBJECT_STORAGE.STREAMING_PLAYLISTS),
+    ResponseContentDisposition: `attachment; filename=${downloadFilename}`
+  })
+
+  return getSignedUrl(getClient(), command, { expiresIn: 3600 * 24 })
+}
diff --git a/server/middlewares/validators/videos/videos.ts b/server/middlewares/validators/videos/videos.ts
index fc2f95aa5..9034772c0 100644
--- a/server/middlewares/validators/videos/videos.ts
+++ b/server/middlewares/validators/videos/videos.ts
@@ -223,10 +223,12 @@ const videosAddResumableInitValidator = getCommonVideoEditAttributes().concat([
 
     if (!isValidPasswordProtectedPrivacy(req, res)) return cleanup()
 
-    // multer required unsetting the Content-Type, now we can set it for node-uploadx
+    // Multer required unsetting the Content-Type, now we can set it for node-uploadx
     req.headers['content-type'] = 'application/json; charset=utf-8'
-    // place previewfile in metadata so that uploadx saves it in .META
+
+    // Place thumbnail/previewfile in metadata so that uploadx saves it in .META
     if (req.files?.['previewfile']) req.body.previewfile = req.files['previewfile']
+    if (req.files?.['thumbnailfile']) req.body.thumbnailfile = req.files['thumbnailfile']
 
     return next()
   }
diff --git a/server/tests/api/check-params/live.ts b/server/tests/api/check-params/live.ts
index 406a96824..5021db516 100644
--- a/server/tests/api/check-params/live.ts
+++ b/server/tests/api/check-params/live.ts
@@ -194,7 +194,7 @@ describe('Test video lives API validator', function () {
     it('Should fail with a big thumbnail file', async function () {
       const fields = baseCorrectParams
       const attaches = {
-        thumbnailfile: buildAbsoluteFixturePath('preview-big.png')
+        thumbnailfile: buildAbsoluteFixturePath('custom-preview-big.png')
       }
 
       await makeUploadRequest({ url: server.url, path, token: server.accessToken, fields, attaches })
@@ -212,7 +212,7 @@ describe('Test video lives API validator', function () {
     it('Should fail with a big preview file', async function () {
       const fields = baseCorrectParams
       const attaches = {
-        previewfile: buildAbsoluteFixturePath('preview-big.png')
+        previewfile: buildAbsoluteFixturePath('custom-preview-big.png')
       }
 
       await makeUploadRequest({ url: server.url, path, token: server.accessToken, fields, attaches })
diff --git a/server/tests/api/check-params/runners.ts b/server/tests/api/check-params/runners.ts
index 48821b678..4ba90802f 100644
--- a/server/tests/api/check-params/runners.ts
+++ b/server/tests/api/check-params/runners.ts
@@ -752,7 +752,7 @@ describe('Test managing runners', function () {
         })
 
         it('Should fail with an invalid vod audio merge payload', async function () {
-          const attributes = { name: 'audio_with_preview', previewfile: 'preview.jpg', fixture: 'sample.ogg' }
+          const attributes = { name: 'audio_with_preview', previewfile: 'custom-preview.jpg', fixture: 'sample.ogg' }
           await server.videos.upload({ attributes, mode: 'legacy' })
 
           await waitJobs([ server ])
diff --git a/server/tests/api/check-params/video-imports.ts b/server/tests/api/check-params/video-imports.ts
index 7f19b9ee9..8c6f43c12 100644
--- a/server/tests/api/check-params/video-imports.ts
+++ b/server/tests/api/check-params/video-imports.ts
@@ -244,7 +244,7 @@ describe('Test video imports API validator', function () {
     it('Should fail with a big thumbnail file', async function () {
       const fields = baseCorrectParams
       const attaches = {
-        thumbnailfile: buildAbsoluteFixturePath('preview-big.png')
+        thumbnailfile: buildAbsoluteFixturePath('custom-preview-big.png')
       }
 
       await makeUploadRequest({ url: server.url, path, token: server.accessToken, fields, attaches })
@@ -262,7 +262,7 @@ describe('Test video imports API validator', function () {
     it('Should fail with a big preview file', async function () {
       const fields = baseCorrectParams
       const attaches = {
-        previewfile: buildAbsoluteFixturePath('preview-big.png')
+        previewfile: buildAbsoluteFixturePath('custom-preview-big.png')
       }
 
       await makeUploadRequest({ url: server.url, path, token: server.accessToken, fields, attaches })
diff --git a/server/tests/api/check-params/video-playlists.ts b/server/tests/api/check-params/video-playlists.ts
index 8090897c1..8c3233e0b 100644
--- a/server/tests/api/check-params/video-playlists.ts
+++ b/server/tests/api/check-params/video-playlists.ts
@@ -196,7 +196,7 @@ describe('Test video playlists API validator', function () {
         attributes: {
           displayName: 'display name',
           privacy: VideoPlaylistPrivacy.UNLISTED,
-          thumbnailfile: 'thumbnail.jpg',
+          thumbnailfile: 'custom-thumbnail.jpg',
           videoChannelId: server.store.channel.id,
 
           ...attributes
@@ -260,7 +260,7 @@ describe('Test video playlists API validator', function () {
     })
 
     it('Should fail with a thumbnail file too big', async function () {
-      const params = getBase({ thumbnailfile: 'preview-big.png' })
+      const params = getBase({ thumbnailfile: 'custom-preview-big.png' })
 
       await command.create(params)
       await command.update(getUpdate(params, playlist.shortUUID))
diff --git a/server/tests/api/check-params/video-studio.ts b/server/tests/api/check-params/video-studio.ts
index add8d9164..4ac0d93ed 100644
--- a/server/tests/api/check-params/video-studio.ts
+++ b/server/tests/api/check-params/video-studio.ts
@@ -293,7 +293,7 @@ describe('Test video studio API validator', function () {
       it('Should succeed with the correct params', async function () {
         this.timeout(120000)
 
-        await addWatermark('thumbnail.jpg', HttpStatusCode.NO_CONTENT_204)
+        await addWatermark('custom-thumbnail.jpg', HttpStatusCode.NO_CONTENT_204)
 
         await waitJobs([ server ])
       })
@@ -322,8 +322,8 @@ describe('Test video studio API validator', function () {
       })
 
       it('Should fail with an invalid file', async function () {
-        await addIntroOutro('add-intro', 'thumbnail.jpg')
-        await addIntroOutro('add-outro', 'thumbnail.jpg')
+        await addIntroOutro('add-intro', 'custom-thumbnail.jpg')
+        await addIntroOutro('add-outro', 'custom-thumbnail.jpg')
       })
 
       it('Should fail with a file that does not contain video stream', async function () {
diff --git a/server/tests/api/check-params/videos.ts b/server/tests/api/check-params/videos.ts
index 094ab6891..6ee1955a7 100644
--- a/server/tests/api/check-params/videos.ts
+++ b/server/tests/api/check-params/videos.ts
@@ -384,7 +384,7 @@ describe('Test videos API validator', function () {
       it('Should fail with a big thumbnail file', async function () {
         const fields = baseCorrectParams
         const attaches = {
-          thumbnailfile: join(root(), 'server', 'tests', 'fixtures', 'preview-big.png'),
+          thumbnailfile: join(root(), 'server', 'tests', 'fixtures', 'custom-preview-big.png'),
           fixture: join(root(), 'server', 'tests', 'fixtures', 'video_short.mp4')
         }
 
@@ -404,7 +404,7 @@ describe('Test videos API validator', function () {
       it('Should fail with a big preview file', async function () {
         const fields = baseCorrectParams
         const attaches = {
-          previewfile: join(root(), 'server', 'tests', 'fixtures', 'preview-big.png'),
+          previewfile: join(root(), 'server', 'tests', 'fixtures', 'custom-preview-big.png'),
           fixture: join(root(), 'server', 'tests', 'fixtures', 'video_short.mp4')
         }
 
@@ -615,7 +615,7 @@ describe('Test videos API validator', function () {
     it('Should fail with a big thumbnail file', async function () {
       const fields = baseCorrectParams
       const attaches = {
-        thumbnailfile: join(root(), 'server', 'tests', 'fixtures', 'preview-big.png')
+        thumbnailfile: join(root(), 'server', 'tests', 'fixtures', 'custom-preview-big.png')
       }
 
       await makeUploadRequest({
@@ -647,7 +647,7 @@ describe('Test videos API validator', function () {
     it('Should fail with a big preview file', async function () {
       const fields = baseCorrectParams
       const attaches = {
-        previewfile: join(root(), 'server', 'tests', 'fixtures', 'preview-big.png')
+        previewfile: join(root(), 'server', 'tests', 'fixtures', 'custom-preview-big.png')
       }
 
       await makeUploadRequest({
diff --git a/server/tests/api/live/live.ts b/server/tests/api/live/live.ts
index 7ab67b126..2b302a8a2 100644
--- a/server/tests/api/live/live.ts
+++ b/server/tests/api/live/live.ts
@@ -2,7 +2,7 @@
 
 import { expect } from 'chai'
 import { basename, join } from 'path'
-import { SQLCommand, testImage, testLiveVideoResolutions } from '@server/tests/shared'
+import { SQLCommand, testImageGeneratedByFFmpeg, testLiveVideoResolutions } from '@server/tests/shared'
 import { getAllFiles, wait } from '@shared/core-utils'
 import { ffprobePromise, getVideoStream } from '@shared/ffmpeg'
 import {
@@ -121,8 +121,8 @@ describe('Test live', function () {
         expect(video.downloadEnabled).to.be.false
         expect(video.privacy.id).to.equal(VideoPrivacy.PUBLIC)
 
-        await testImage(server.url, 'video_short1-preview.webm', video.previewPath)
-        await testImage(server.url, 'video_short1.webm', video.thumbnailPath)
+        await testImageGeneratedByFFmpeg(server.url, 'video_short1-preview.webm', video.previewPath)
+        await testImageGeneratedByFFmpeg(server.url, 'video_short1.webm', video.thumbnailPath)
 
         const live = await server.live.get({ videoId: liveVideoUUID })
 
diff --git a/server/tests/api/runners/runner-studio-transcoding.ts b/server/tests/api/runners/runner-studio-transcoding.ts
index 41c556775..443a9d02a 100644
--- a/server/tests/api/runners/runner-studio-transcoding.ts
+++ b/server/tests/api/runners/runner-studio-transcoding.ts
@@ -104,7 +104,7 @@ describe('Test runner video studio transcoding', function () {
       {
         name: 'add-watermark' as 'add-watermark',
         options: {
-          file: 'thumbnail.png'
+          file: 'custom-thumbnail.png'
         }
       },
       {
diff --git a/server/tests/api/runners/runner-vod-transcoding.ts b/server/tests/api/runners/runner-vod-transcoding.ts
index d9da0f40d..ca16d9c10 100644
--- a/server/tests/api/runners/runner-vod-transcoding.ts
+++ b/server/tests/api/runners/runner-vod-transcoding.ts
@@ -424,7 +424,7 @@ describe('Test runner VOD transcoding', function () {
 
       await servers[0].config.enableTranscoding(true, true)
 
-      const attributes = { name: 'audio_with_preview', previewfile: 'preview.jpg', fixture: 'sample.ogg' }
+      const attributes = { name: 'audio_with_preview', previewfile: 'custom-preview.jpg', fixture: 'sample.ogg' }
       const { uuid } = await servers[0].videos.upload({ attributes, mode: 'legacy' })
       videoUUID = uuid
 
diff --git a/server/tests/api/transcoding/transcoder.ts b/server/tests/api/transcoding/transcoder.ts
index 8a0a7f6d2..3cd247a24 100644
--- a/server/tests/api/transcoding/transcoder.ts
+++ b/server/tests/api/transcoding/transcoder.ts
@@ -353,7 +353,7 @@ describe('Test video transcoding', function () {
       it('Should merge an audio file with the preview file', async function () {
         this.timeout(60_000)
 
-        const attributes = { name: 'audio_with_preview', previewfile: 'preview.jpg', fixture: 'sample.ogg' }
+        const attributes = { name: 'audio_with_preview', previewfile: 'custom-preview.jpg', fixture: 'sample.ogg' }
         await servers[1].videos.upload({ attributes, mode })
 
         await waitJobs(servers)
@@ -416,7 +416,7 @@ describe('Test video transcoding', function () {
           }
         })
 
-        const attributes = { name: 'audio_with_preview', previewfile: 'preview.jpg', fixture: 'sample.ogg' }
+        const attributes = { name: 'audio_with_preview', previewfile: 'custom-preview.jpg', fixture: 'sample.ogg' }
         const { id } = await servers[1].videos.upload({ attributes, mode })
 
         await waitJobs(servers)
diff --git a/server/tests/api/transcoding/video-studio.ts b/server/tests/api/transcoding/video-studio.ts
index d1298caf7..e97f2b689 100644
--- a/server/tests/api/transcoding/video-studio.ts
+++ b/server/tests/api/transcoding/video-studio.ts
@@ -241,7 +241,7 @@ describe('Test video studio', function () {
         {
           name: 'add-watermark',
           options: {
-            file: 'thumbnail.png'
+            file: 'custom-thumbnail.png'
           }
         }
       ])
diff --git a/server/tests/api/videos/multiple-servers.ts b/server/tests/api/videos/multiple-servers.ts
index 27ba00d3d..e9aa0e3a1 100644
--- a/server/tests/api/videos/multiple-servers.ts
+++ b/server/tests/api/videos/multiple-servers.ts
@@ -9,7 +9,7 @@ import {
   completeVideoCheck,
   dateIsValid,
   saveVideoInServers,
-  testImage
+  testImageGeneratedByFFmpeg
 } from '@server/tests/shared'
 import { buildAbsoluteFixturePath, wait } from '@shared/core-utils'
 import { HttpStatusCode, VideoCommentThreadTree, VideoPrivacy } from '@shared/models'
@@ -70,8 +70,9 @@ describe('Test multiple servers', function () {
   })
 
   describe('Should upload the video and propagate on each server', function () {
+
     it('Should upload the video on server 1 and propagate on each server', async function () {
-      this.timeout(25000)
+      this.timeout(60000)
 
       const attributes = {
         name: 'my super name for server 1',
@@ -175,8 +176,8 @@ describe('Test multiple servers', function () {
         support: 'my super support text for server 2',
         tags: [ 'tag1p2', 'tag2p2', 'tag3p2' ],
         fixture: 'video_short2.webm',
-        thumbnailfile: 'thumbnail.jpg',
-        previewfile: 'preview.jpg'
+        thumbnailfile: 'custom-thumbnail.jpg',
+        previewfile: 'custom-preview.jpg'
       }
       await servers[1].videos.upload({ token: userAccessToken, attributes, mode: 'resumable' })
 
@@ -229,8 +230,8 @@ describe('Test multiple servers', function () {
               size: 750000
             }
           ],
-          thumbnailfile: 'thumbnail',
-          previewfile: 'preview'
+          thumbnailfile: 'custom-thumbnail',
+          previewfile: 'custom-preview'
         }
 
         const { data } = await server.videos.list()
@@ -619,9 +620,9 @@ describe('Test multiple servers', function () {
         description: 'my super description updated',
         support: 'my super support text updated',
         tags: [ 'tag_up_1', 'tag_up_2' ],
-        thumbnailfile: 'thumbnail.jpg',
+        thumbnailfile: 'custom-thumbnail.jpg',
         originallyPublishedAt: '2019-02-11T13:38:14.449Z',
-        previewfile: 'preview.jpg'
+        previewfile: 'custom-preview.jpg'
       }
 
       updatedAtMin = new Date()
@@ -674,8 +675,8 @@ describe('Test multiple servers', function () {
               size: 292677
             }
           ],
-          thumbnailfile: 'thumbnail',
-          previewfile: 'preview'
+          thumbnailfile: 'custom-thumbnail',
+          previewfile: 'custom-preview'
         }
         await completeVideoCheck({ server, originServer: servers[2], videoUUID: videoUpdated.uuid, attributes: checkAttributes })
       }
@@ -685,7 +686,7 @@ describe('Test multiple servers', function () {
       this.timeout(30000)
 
       const attributes = {
-        thumbnailfile: 'thumbnail.jpg'
+        thumbnailfile: 'custom-thumbnail.jpg'
       }
 
       updatedAtMin = new Date()
@@ -761,7 +762,7 @@ describe('Test multiple servers', function () {
       for (const server of servers) {
         const video = await server.videos.get({ id: videoUUID })
 
-        await testImage(server.url, 'video_short1-preview.webm', video.previewPath)
+        await testImageGeneratedByFFmpeg(server.url, 'video_short1-preview.webm', video.previewPath)
       }
     })
   })
diff --git a/server/tests/api/videos/single-server.ts b/server/tests/api/videos/single-server.ts
index 0cb64d5a5..66414aa5b 100644
--- a/server/tests/api/videos/single-server.ts
+++ b/server/tests/api/videos/single-server.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-unused-expressions,@typescript-eslint/require-await */
 
 import { expect } from 'chai'
-import { checkVideoFilesWereRemoved, completeVideoCheck, testImage } from '@server/tests/shared'
+import { checkVideoFilesWereRemoved, completeVideoCheck, testImageGeneratedByFFmpeg } from '@server/tests/shared'
 import { wait } from '@shared/core-utils'
 import { Video, VideoPrivacy } from '@shared/models'
 import {
@@ -260,7 +260,7 @@ describe('Test a single server', function () {
 
       for (const video of data) {
         const videoName = video.name.replace(' name', '')
-        await testImage(server.url, videoName, video.thumbnailPath)
+        await testImageGeneratedByFFmpeg(server.url, videoName, video.thumbnailPath)
       }
     })
 
diff --git a/server/tests/api/videos/video-imports.ts b/server/tests/api/videos/video-imports.ts
index 192b2aeb9..a684a55a0 100644
--- a/server/tests/api/videos/video-imports.ts
+++ b/server/tests/api/videos/video-imports.ts
@@ -3,7 +3,7 @@
 import { expect } from 'chai'
 import { pathExists, readdir, remove } from 'fs-extra'
 import { join } from 'path'
-import { FIXTURE_URLS, testCaptionFile, testImage } from '@server/tests/shared'
+import { FIXTURE_URLS, testCaptionFile, testImageGeneratedByFFmpeg } from '@server/tests/shared'
 import { areHttpImportTestsDisabled } from '@shared/core-utils'
 import { CustomConfig, HttpStatusCode, Video, VideoImportState, VideoPrivacy, VideoResolution, VideoState } from '@shared/models'
 import {
@@ -67,7 +67,7 @@ async function checkVideoServer2 (server: PeerTubeServer, id: number | string) {
   expect(video.description).to.equal('my super description')
   expect(video.tags).to.deep.equal([ 'supertag1', 'supertag2' ])
 
-  await testImage(server.url, 'thumbnail', video.thumbnailPath)
+  await testImageGeneratedByFFmpeg(server.url, 'custom-thumbnail', video.thumbnailPath)
 
   expect(video.files).to.have.lengthOf(1)
 
@@ -126,8 +126,8 @@ describe('Test video imports', function () {
               ? '_yt_dlp'
               : ''
 
-            await testImage(servers[0].url, 'video_import_thumbnail' + suffix, video.thumbnailPath)
-            await testImage(servers[0].url, 'video_import_preview' + suffix, video.previewPath)
+            await testImageGeneratedByFFmpeg(servers[0].url, 'video_import_thumbnail' + suffix, video.thumbnailPath)
+            await testImageGeneratedByFFmpeg(servers[0].url, 'video_import_preview' + suffix, video.previewPath)
           }
 
           const bodyCaptions = await servers[0].captions.list({ videoId: video.id })
@@ -266,7 +266,7 @@ describe('Test video imports', function () {
             name: 'my super name',
             description: 'my super description',
             tags: [ 'supertag1', 'supertag2' ],
-            thumbnailfile: 'thumbnail.jpg'
+            thumbnailfile: 'custom-thumbnail.jpg'
           }
         })
         expect(video.name).to.equal('my super name')
diff --git a/server/tests/api/videos/video-playlist-thumbnails.ts b/server/tests/api/videos/video-playlist-thumbnails.ts
index 356939b93..c274c20bf 100644
--- a/server/tests/api/videos/video-playlist-thumbnails.ts
+++ b/server/tests/api/videos/video-playlist-thumbnails.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-unused-expressions,@typescript-eslint/require-await */
 
 import { expect } from 'chai'
-import { testImage } from '@server/tests/shared'
+import { testImageGeneratedByFFmpeg } from '@server/tests/shared'
 import { VideoPlaylistPrivacy } from '@shared/models'
 import {
   cleanupTests,
@@ -83,7 +83,7 @@ describe('Playlist thumbnail', function () {
 
     for (const server of servers) {
       const p = await getPlaylistWithoutThumbnail(server)
-      await testImage(server.url, 'thumbnail-playlist', p.thumbnailPath)
+      await testImageGeneratedByFFmpeg(server.url, 'thumbnail-playlist', p.thumbnailPath)
     }
   })
 
@@ -95,7 +95,7 @@ describe('Playlist thumbnail', function () {
         displayName: 'playlist with thumbnail',
         privacy: VideoPlaylistPrivacy.PUBLIC,
         videoChannelId: servers[1].store.channel.id,
-        thumbnailfile: 'thumbnail.jpg'
+        thumbnailfile: 'custom-thumbnail.jpg'
       }
     })
     playlistWithThumbnailId = created.id
@@ -110,7 +110,7 @@ describe('Playlist thumbnail', function () {
 
     for (const server of servers) {
       const p = await getPlaylistWithThumbnail(server)
-      await testImage(server.url, 'thumbnail', p.thumbnailPath)
+      await testImageGeneratedByFFmpeg(server.url, 'custom-thumbnail', p.thumbnailPath)
     }
   })
 
@@ -135,7 +135,7 @@ describe('Playlist thumbnail', function () {
 
     for (const server of servers) {
       const p = await getPlaylistWithoutThumbnail(server)
-      await testImage(server.url, 'thumbnail-playlist', p.thumbnailPath)
+      await testImageGeneratedByFFmpeg(server.url, 'thumbnail-playlist', p.thumbnailPath)
     }
   })
 
@@ -160,7 +160,7 @@ describe('Playlist thumbnail', function () {
 
     for (const server of servers) {
       const p = await getPlaylistWithThumbnail(server)
-      await testImage(server.url, 'thumbnail', p.thumbnailPath)
+      await testImageGeneratedByFFmpeg(server.url, 'custom-thumbnail', p.thumbnailPath)
     }
   })
 
@@ -176,7 +176,7 @@ describe('Playlist thumbnail', function () {
 
     for (const server of servers) {
       const p = await getPlaylistWithoutThumbnail(server)
-      await testImage(server.url, 'thumbnail-playlist', p.thumbnailPath)
+      await testImageGeneratedByFFmpeg(server.url, 'thumbnail-playlist', p.thumbnailPath)
     }
   })
 
@@ -192,7 +192,7 @@ describe('Playlist thumbnail', function () {
 
     for (const server of servers) {
       const p = await getPlaylistWithThumbnail(server)
-      await testImage(server.url, 'thumbnail', p.thumbnailPath)
+      await testImageGeneratedByFFmpeg(server.url, 'custom-thumbnail', p.thumbnailPath)
     }
   })
 
@@ -224,7 +224,7 @@ describe('Playlist thumbnail', function () {
 
     for (const server of servers) {
       const p = await getPlaylistWithThumbnail(server)
-      await testImage(server.url, 'thumbnail', p.thumbnailPath)
+      await testImageGeneratedByFFmpeg(server.url, 'custom-thumbnail', p.thumbnailPath)
     }
   })
 
diff --git a/server/tests/api/videos/video-playlists.ts b/server/tests/api/videos/video-playlists.ts
index 9277b49f4..3bfa874cb 100644
--- a/server/tests/api/videos/video-playlists.ts
+++ b/server/tests/api/videos/video-playlists.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-unused-expressions,@typescript-eslint/require-await */
 
 import { expect } from 'chai'
-import { checkPlaylistFilesWereRemoved, testImage } from '@server/tests/shared'
+import { checkPlaylistFilesWereRemoved, testImageGeneratedByFFmpeg } from '@server/tests/shared'
 import { wait } from '@shared/core-utils'
 import { uuidToShort } from '@shared/extra-utils'
 import {
@@ -133,7 +133,7 @@ describe('Test video playlists', function () {
           displayName: 'my super playlist',
           privacy: VideoPlaylistPrivacy.PUBLIC,
           description: 'my super description',
-          thumbnailfile: 'thumbnail.jpg',
+          thumbnailfile: 'custom-thumbnail.jpg',
           videoChannelId: servers[0].store.channel.id
         }
       })
@@ -225,7 +225,7 @@ describe('Test video playlists', function () {
           displayName: 'my super playlist',
           privacy: VideoPlaylistPrivacy.PUBLIC,
           description: 'my super description',
-          thumbnailfile: 'thumbnail.jpg',
+          thumbnailfile: 'custom-thumbnail.jpg',
           videoChannelId: servers[0].store.channel.id
         }
       })
@@ -286,7 +286,7 @@ describe('Test video playlists', function () {
           attributes: {
             displayName: 'playlist 3',
             privacy: VideoPlaylistPrivacy.PUBLIC,
-            thumbnailfile: 'thumbnail.jpg',
+            thumbnailfile: 'custom-thumbnail.jpg',
             videoChannelId: servers[1].store.channel.id
           }
         })
@@ -314,11 +314,11 @@ describe('Test video playlists', function () {
 
         const playlist2 = body.data.find(p => p.displayName === 'playlist 2')
         expect(playlist2).to.not.be.undefined
-        await testImage(server.url, 'thumbnail-playlist', playlist2.thumbnailPath)
+        await testImageGeneratedByFFmpeg(server.url, 'thumbnail-playlist', playlist2.thumbnailPath)
 
         const playlist3 = body.data.find(p => p.displayName === 'playlist 3')
         expect(playlist3).to.not.be.undefined
-        await testImage(server.url, 'thumbnail', playlist3.thumbnailPath)
+        await testImageGeneratedByFFmpeg(server.url, 'custom-thumbnail', playlist3.thumbnailPath)
       }
 
       const body = await servers[2].playlists.list({ start: 0, count: 5 })
@@ -336,7 +336,7 @@ describe('Test video playlists', function () {
 
       const playlist2 = body.data.find(p => p.displayName === 'playlist 2')
       expect(playlist2).to.not.be.undefined
-      await testImage(servers[2].url, 'thumbnail-playlist', playlist2.thumbnailPath)
+      await testImageGeneratedByFFmpeg(servers[2].url, 'thumbnail-playlist', playlist2.thumbnailPath)
 
       expect(body.data.find(p => p.displayName === 'playlist 3')).to.not.be.undefined
     })
@@ -502,7 +502,7 @@ describe('Test video playlists', function () {
           displayName: 'playlist 3 updated',
           description: 'description updated',
           privacy: VideoPlaylistPrivacy.UNLISTED,
-          thumbnailfile: 'thumbnail.jpg',
+          thumbnailfile: 'custom-thumbnail.jpg',
           videoChannelId: servers[1].store.channel.id
         },
         playlistId: playlistServer2Id2
diff --git a/server/tests/api/videos/video-storyboard.ts b/server/tests/api/videos/video-storyboard.ts
index 5fde6ce45..fc4b4450f 100644
--- a/server/tests/api/videos/video-storyboard.ts
+++ b/server/tests/api/videos/video-storyboard.ts
@@ -110,7 +110,11 @@ describe('Test video storyboard', function () {
     await waitJobs(servers)
 
     for (const server of servers) {
-      await checkStoryboard({ server, uuid, tilesCount: 6, minSize: 250 })
+      try {
+        await checkStoryboard({ server, uuid, tilesCount: 6, minSize: 250 })
+      } catch { // FIXME: to remove after ffmpeg CI upgrade, ffmpeg CI version (4.3) generates a 7.6s length video
+        await checkStoryboard({ server, uuid, tilesCount: 8, minSize: 250 })
+      }
     }
   })
 
diff --git a/server/tests/cli/prune-storage.ts b/server/tests/cli/prune-storage.ts
index 8bdf2136d..dc8ecd3d3 100644
--- a/server/tests/cli/prune-storage.ts
+++ b/server/tests/cli/prune-storage.ts
@@ -85,7 +85,7 @@ describe('Test prune storage scripts', function () {
           displayName: 'playlist',
           privacy: VideoPlaylistPrivacy.PUBLIC,
           videoChannelId: server.store.channel.id,
-          thumbnailfile: 'thumbnail.jpg'
+          thumbnailfile: 'custom-thumbnail.jpg'
         }
       })
     }
diff --git a/server/tests/fixtures/custom-preview-big.png b/server/tests/fixtures/custom-preview-big.png
new file mode 100644
index 000000000..03d171af3
Binary files /dev/null and b/server/tests/fixtures/custom-preview-big.png differ
diff --git a/server/tests/fixtures/custom-preview.jpg b/server/tests/fixtures/custom-preview.jpg
new file mode 100644
index 000000000..5a039d830
Binary files /dev/null and b/server/tests/fixtures/custom-preview.jpg differ
diff --git a/server/tests/fixtures/custom-thumbnail-big.jpg b/server/tests/fixtures/custom-thumbnail-big.jpg
new file mode 100644
index 000000000..08375e425
Binary files /dev/null and b/server/tests/fixtures/custom-thumbnail-big.jpg differ
diff --git a/server/tests/fixtures/custom-thumbnail.jpg b/server/tests/fixtures/custom-thumbnail.jpg
new file mode 100644
index 000000000..ef818442d
Binary files /dev/null and b/server/tests/fixtures/custom-thumbnail.jpg differ
diff --git a/server/tests/fixtures/custom-thumbnail.png b/server/tests/fixtures/custom-thumbnail.png
new file mode 100644
index 000000000..9f34daec1
Binary files /dev/null and b/server/tests/fixtures/custom-thumbnail.png differ
diff --git a/server/tests/fixtures/preview-big.png b/server/tests/fixtures/preview-big.png
deleted file mode 100644
index 612e297f1..000000000
Binary files a/server/tests/fixtures/preview-big.png and /dev/null differ
diff --git a/server/tests/fixtures/preview.jpg b/server/tests/fixtures/preview.jpg
deleted file mode 100644
index 1421da738..000000000
Binary files a/server/tests/fixtures/preview.jpg and /dev/null differ
diff --git a/server/tests/fixtures/thumbnail-big.jpg b/server/tests/fixtures/thumbnail-big.jpg
deleted file mode 100644
index 537720d24..000000000
Binary files a/server/tests/fixtures/thumbnail-big.jpg and /dev/null differ
diff --git a/server/tests/fixtures/thumbnail.jpg b/server/tests/fixtures/thumbnail.jpg
deleted file mode 100644
index 020853780..000000000
Binary files a/server/tests/fixtures/thumbnail.jpg and /dev/null differ
diff --git a/server/tests/fixtures/thumbnail.png b/server/tests/fixtures/thumbnail.png
deleted file mode 100644
index b331aba3b..000000000
Binary files a/server/tests/fixtures/thumbnail.png and /dev/null differ
diff --git a/server/tests/fixtures/video_short1-preview.webm.jpg b/server/tests/fixtures/video_short1-preview.webm.jpg
index f5659f6a8..15454942d 100644
Binary files a/server/tests/fixtures/video_short1-preview.webm.jpg and b/server/tests/fixtures/video_short1-preview.webm.jpg differ
diff --git a/server/tests/fixtures/video_short1.webm.jpg b/server/tests/fixtures/video_short1.webm.jpg
index 26a697daa..b2740d73d 100644
Binary files a/server/tests/fixtures/video_short1.webm.jpg and b/server/tests/fixtures/video_short1.webm.jpg differ
diff --git a/server/tests/fixtures/video_short2.webm.jpg b/server/tests/fixtures/video_short2.webm.jpg
index 020853780..afe476c7f 100644
Binary files a/server/tests/fixtures/video_short2.webm.jpg and b/server/tests/fixtures/video_short2.webm.jpg differ
diff --git a/server/tests/helpers/image.ts b/server/tests/helpers/image.ts
index 530c9bacd..6021ffc48 100644
--- a/server/tests/helpers/image.ts
+++ b/server/tests/helpers/image.ts
@@ -35,28 +35,28 @@ describe('Image helpers', function () {
   const thumbnailSize = { width: 280, height: 157 }
 
   it('Should skip processing if the source image is okay', async function () {
-    const input = buildAbsoluteFixturePath('thumbnail.jpg')
+    const input = buildAbsoluteFixturePath('custom-thumbnail.jpg')
     await processImage({ path: input, destination: imageDestJPG, newSize: thumbnailSize, keepOriginal: true })
 
     await checkBuffers(input, imageDestJPG, true)
   })
 
   it('Should not skip processing if the source image does not have the appropriate extension', async function () {
-    const input = buildAbsoluteFixturePath('thumbnail.png')
+    const input = buildAbsoluteFixturePath('custom-thumbnail.png')
     await processImage({ path: input, destination: imageDestJPG, newSize: thumbnailSize, keepOriginal: true })
 
     await checkBuffers(input, imageDestJPG, false)
   })
 
   it('Should not skip processing if the source image does not have the appropriate size', async function () {
-    const input = buildAbsoluteFixturePath('preview.jpg')
+    const input = buildAbsoluteFixturePath('custom-preview.jpg')
     await processImage({ path: input, destination: imageDestJPG, newSize: thumbnailSize, keepOriginal: true })
 
     await checkBuffers(input, imageDestJPG, false)
   })
 
   it('Should not skip processing if the source image does not have the appropriate size', async function () {
-    const input = buildAbsoluteFixturePath('thumbnail-big.jpg')
+    const input = buildAbsoluteFixturePath('custom-thumbnail-big.jpg')
     await processImage({ path: input, destination: imageDestJPG, newSize: thumbnailSize, keepOriginal: true })
 
     await checkBuffers(input, imageDestJPG, false)
diff --git a/server/tests/shared/checks.ts b/server/tests/shared/checks.ts
index feaef37c6..90179c6ac 100644
--- a/server/tests/shared/checks.ts
+++ b/server/tests/shared/checks.ts
@@ -61,6 +61,16 @@ async function testImageSize (url: string, imageName: string, imageHTTPPath: str
   expect(body.length).to.be.below(maxLength, 'the generated image is way larger than the recorded fixture')
 }
 
+async function testImageGeneratedByFFmpeg (url: string, imageName: string, imageHTTPPath: string, extension = '.jpg') {
+  if (process.env.ENABLE_FFMPEG_THUMBNAIL_PIXEL_COMPARISON_TESTS !== 'true') {
+    console.log(
+      'Pixel comparison of image generated by ffmpeg is disabled. ' +
+      'You can enable it using `ENABLE_FFMPEG_THUMBNAIL_PIXEL_COMPARISON_TESTS=true env variable')
+  }
+
+  return testImage(url, imageName, imageHTTPPath, extension)
+}
+
 async function testImage (url: string, imageName: string, imageHTTPPath: string, extension = '.jpg') {
   const res = await makeGetRequest({
     url,
@@ -148,6 +158,7 @@ async function checkVideoDuration (server: PeerTubeServer, videoUUID: string, du
 
 export {
   dateIsValid,
+  testImageGeneratedByFFmpeg,
   testImageSize,
   testImage,
   expectLogDoesNotContain,
diff --git a/server/tests/shared/videos.ts b/server/tests/shared/videos.ts
index 856fabd11..0bd161820 100644
--- a/server/tests/shared/videos.ts
+++ b/server/tests/shared/videos.ts
@@ -7,7 +7,7 @@ import { loadLanguages, VIDEO_CATEGORIES, VIDEO_LANGUAGES, VIDEO_LICENCES, VIDEO
 import { getLowercaseExtension, pick, uuidRegex } from '@shared/core-utils'
 import { HttpStatusCode, VideoCaption, VideoDetails, VideoPrivacy, VideoResolution } from '@shared/models'
 import { makeRawRequest, PeerTubeServer, VideoEdit, waitJobs } from '@shared/server-commands'
-import { dateIsValid, expectStartWith, testImage } from './checks'
+import { dateIsValid, expectStartWith, testImageGeneratedByFFmpeg } from './checks'
 import { checkWebTorrentWorks } from './webtorrent'
 
 loadLanguages()
@@ -197,11 +197,11 @@ async function completeVideoCheck (options: {
   expect(video.downloadEnabled).to.equal(attributes.downloadEnabled)
 
   expect(video.thumbnailPath).to.exist
-  await testImage(server.url, attributes.thumbnailfile || attributes.fixture, video.thumbnailPath)
+  await testImageGeneratedByFFmpeg(server.url, attributes.thumbnailfile || attributes.fixture, video.thumbnailPath)
 
   if (attributes.previewfile) {
     expect(video.previewPath).to.exist
-    await testImage(server.url, attributes.previewfile, video.previewPath)
+    await testImageGeneratedByFFmpeg(server.url, attributes.previewfile, video.previewPath)
   }
 
   await completeWebVideoFilesCheck({ server, originServer, videoUUID: video.uuid, ...pick(attributes, [ 'fixture', 'files' ]) })
diff --git a/shared/server-commands/server/server.ts b/shared/server-commands/server/server.ts
index 6aa4296b0..9a07eb36f 100644
--- a/shared/server-commands/server/server.ts
+++ b/shared/server-commands/server/server.ts
@@ -237,7 +237,7 @@ export class PeerTubeServer {
     }
 
     // Share the environment
-    const env = Object.create(process.env)
+    const env = { ...process.env }
     env['NODE_ENV'] = 'test'
     env['NODE_APP_INSTANCE'] = this.internalServerNumber.toString()
     env['NODE_CONFIG'] = JSON.stringify(configOverride)
diff --git a/shared/server-commands/videos/video-studio-command.ts b/shared/server-commands/videos/video-studio-command.ts
index 9fe467cc2..675cd84b7 100644
--- a/shared/server-commands/videos/video-studio-command.ts
+++ b/shared/server-commands/videos/video-studio-command.ts
@@ -25,7 +25,7 @@ export class VideoStudioCommand extends AbstractCommand {
       {
         name: 'add-watermark',
         options: {
-          file: 'thumbnail.png'
+          file: 'custom-thumbnail.png'
         }
       },
 
diff --git a/support/doc/development/tests.md b/support/doc/development/tests.md
index e3a65c35f..1c2589c8a 100644
--- a/support/doc/development/tests.md
+++ b/support/doc/development/tests.md
@@ -71,6 +71,7 @@ Some env variables can be defined to disable/enable some tests:
  * `ENABLE_OBJECT_STORAGE_TESTS=true`: enable object storage tests (needs `chocobozzz/s3-ninja` container first)
  * `AKISMET_KEY`: specify an Akismet key to test akismet external PeerTube plugin
  * `OBJECT_STORAGE_SCALEWAY_KEY_ID` and `OBJECT_STORAGE_SCALEWAY_ACCESS_KEY`: specify Scaleway API keys to test object storage ACL (not supported by our `chocobozzz/s3-ninja` container)
+ * `ENABLE_FFMPEG_THUMBNAIL_PIXEL_COMPARISON_TESTS=true`: enable pixel comparison on images generated by ffmpeg. Disabled by default because a custom ffmpeg version may fails the tests
 
 
 ### Debug server logs