7 files changed, 159 insertions, 75 deletions

diff --git a/server/lib/emailer.ts b/server/lib/emailer.ts
index 8c06e9751..c4a5a5853 100644
--- a/server/lib/emailer.ts
+++ b/server/lib/emailer.ts
@@ -100,11 +100,11 @@ class Emailer {
       `You can view it on ${videoUrl} ` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: channelName + ' just published a new video',
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + channelName + ' just published a new video',
       text
     }
 
@@ -119,11 +119,11 @@ class Emailer {
       `Your ${followType} ${followingName} has a new subscriber: ${followerName}` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: 'New follower on your channel ' + followingName,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'New follower on your channel ' + followingName,
       text
     }
 
@@ -137,11 +137,11 @@ class Emailer {
       `Your instance has a new follower: ${actorFollow.ActorFollower.url}${awaitingApproval}` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: 'New instance follower',
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'New instance follower',
       text
     }
 
@@ -157,11 +157,11 @@ class Emailer {
       `You can view it on ${videoUrl} ` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: `Your video ${video.name} is published`,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + `Your video ${video.name} is published`,
       text
     }
 
@@ -177,11 +177,11 @@ class Emailer {
       `You can view the imported video on ${videoUrl} ` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: `Your video import ${videoImport.getTargetIdentifier()} is finished`,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + `Your video import ${videoImport.getTargetIdentifier()} is finished`,
       text
     }
 
@@ -197,11 +197,11 @@ class Emailer {
       `See your videos import dashboard for more information: ${importUrl}` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: `Your video import ${videoImport.getTargetIdentifier()} encountered an error`,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + `Your video import ${videoImport.getTargetIdentifier()} encountered an error`,
       text
     }
 
@@ -219,11 +219,11 @@ class Emailer {
       `You can view it on ${commentUrl} ` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: 'New comment on your video ' + video.name,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'New comment on your video ' + video.name,
       text
     }
 
@@ -241,11 +241,11 @@ class Emailer {
       `You can view the comment on ${commentUrl} ` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: 'Mention on video ' + video.name,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'Mention on video ' + video.name,
       text
     }
 
@@ -258,11 +258,11 @@ class Emailer {
     const text = `Hi,\n\n` +
       `${WEBSERVER.HOST} received an abuse for the following video ${videoUrl}\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: '[PeerTube] Received a video abuse',
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'Received a video abuse',
       text
     }
 
@@ -281,11 +281,11 @@ class Emailer {
       `A full list of auto-blacklisted videos can be reviewed here: ${VIDEO_AUTO_BLACKLIST_URL}` +
       `\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: '[PeerTube] An auto-blacklisted video is awaiting review',
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'An auto-blacklisted video is awaiting review',
       text
     }
 
@@ -296,11 +296,11 @@ class Emailer {
     const text = `Hi,\n\n` +
       `User ${user.username} just registered on ${WEBSERVER.HOST} PeerTube instance.\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: '[PeerTube] New user registration on ' + WEBSERVER.HOST,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'New user registration on ' + WEBSERVER.HOST,
       text
     }
 
@@ -318,11 +318,11 @@ class Emailer {
       blockedString +
       '\n\n' +
       'Cheers,\n' +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: `[PeerTube] Video ${videoName} blacklisted`,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + `Video ${videoName} blacklisted`,
       text
     }
 
@@ -336,11 +336,11 @@ class Emailer {
       `Your video ${video.name} (${videoUrl}) on ${WEBSERVER.HOST} has been unblacklisted.` +
       '\n\n' +
       'Cheers,\n' +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to,
-      subject: `[PeerTube] Video ${video.name} unblacklisted`,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + `Video ${video.name} unblacklisted`,
       text
     }
 
@@ -353,11 +353,11 @@ class Emailer {
       `Please follow this link to reset it: ${resetPasswordUrl}\n\n` +
       `If you are not the person who initiated this request, please ignore this email.\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to: [ to ],
-      subject: 'Reset your PeerTube password',
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'Reset your password',
       text
     }
 
@@ -370,11 +370,11 @@ class Emailer {
       `Please follow this link to verify this email belongs to you: ${verifyEmailUrl}\n\n` +
       `If you are not the person who initiated this request, please ignore this email.\n\n` +
       `Cheers,\n` +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const emailPayload: EmailPayload = {
       to: [ to ],
-      subject: 'Verify your PeerTube email',
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'Verify your email',
       text
     }
 
@@ -390,12 +390,12 @@ class Emailer {
       blockedString +
       '\n\n' +
       'Cheers,\n' +
-      `PeerTube.`
+      `${CONFIG.EMAIL.BODY.SIGNATURE}`
 
     const to = user.email
     const emailPayload: EmailPayload = {
       to: [ to ],
-      subject: '[PeerTube] Account ' + blockedWord,
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'Account ' + blockedWord,
       text
     }
 
@@ -415,7 +415,7 @@ class Emailer {
       fromDisplayName: fromEmail,
       replyTo: fromEmail,
       to: [ CONFIG.ADMIN.EMAIL ],
-      subject: '[PeerTube] Contact form submitted',
+      subject: CONFIG.EMAIL.OBJECT.PREFIX + 'Contact form submitted',
       text
     }
 
diff --git a/server/lib/files-cache/videos-preview-cache.ts b/server/lib/files-cache/videos-preview-cache.ts
index 14be7f24a..a68619d07 100644
--- a/server/lib/files-cache/videos-preview-cache.ts
+++ b/server/lib/files-cache/videos-preview-cache.ts
@@ -21,7 +21,7 @@ class VideosPreviewCache extends AbstractVideoStaticFileCache <string> {
     const video = await VideoModel.loadByUUIDWithFile(videoUUID)
     if (!video) return undefined
 
-    if (video.isOwned()) return { isOwned: true, path: join(CONFIG.STORAGE.PREVIEWS_DIR, video.getPreview().filename) }
+    if (video.isOwned()) return { isOwned: true, path: video.getPreview().getPath() }
 
     return this.loadRemoteFile(videoUUID)
   }
diff --git a/server/lib/job-queue/handlers/video-file-import.ts b/server/lib/job-queue/handlers/video-file-import.ts
index 921d9a083..8cacb0ef3 100644
--- a/server/lib/job-queue/handlers/video-file-import.ts
+++ b/server/lib/job-queue/handlers/video-file-import.ts
@@ -1,7 +1,7 @@
 import * as Bull from 'bull'
 import { logger } from '../../../helpers/logger'
 import { VideoModel } from '../../../models/video/video'
-import { publishVideoIfNeeded } from './video-transcoding'
+import { publishNewResolutionIfNeeded } from './video-transcoding'
 import { getVideoFileFPS, getVideoFileResolution } from '../../../helpers/ffmpeg-utils'
 import { copy, stat } from 'fs-extra'
 import { VideoFileModel } from '../../../models/video/video-file'
@@ -25,7 +25,7 @@ async function processVideoFileImport (job: Bull.Job) {
 
   await updateVideoFile(video, payload.filePath)
 
-  await publishVideoIfNeeded(video)
+  await publishNewResolutionIfNeeded(video)
   return video
 }
 
diff --git a/server/lib/job-queue/handlers/video-import.ts b/server/lib/job-queue/handlers/video-import.ts
index 1650916a6..50e159245 100644
--- a/server/lib/job-queue/handlers/video-import.ts
+++ b/server/lib/job-queue/handlers/video-import.ts
@@ -209,6 +209,7 @@ async function processFile (downloader: () => Promise<string>, videoImport: Vide
     if (videoImportUpdated.Video.state === VideoState.TO_TRANSCODE) {
       // Put uuid because we don't have id auto incremented for now
       const dataInput = {
+        type: 'optimize' as 'optimize',
         videoUUID: videoImportUpdated.Video.uuid,
         isNewVideo: true
       }
diff --git a/server/lib/job-queue/handlers/video-transcoding.ts b/server/lib/job-queue/handlers/video-transcoding.ts
index 48cac517e..e9b84ecd6 100644
--- a/server/lib/job-queue/handlers/video-transcoding.ts
+++ b/server/lib/job-queue/handlers/video-transcoding.ts
@@ -8,18 +8,39 @@ import { retryTransactionWrapper } from '../../../helpers/database-utils'
 import { sequelizeTypescript } from '../../../initializers'
 import * as Bluebird from 'bluebird'
 import { computeResolutionsToTranscode } from '../../../helpers/ffmpeg-utils'
-import { generateHlsPlaylist, optimizeVideofile, transcodeOriginalVideofile } from '../../video-transcoding'
+import { generateHlsPlaylist, optimizeVideofile, transcodeOriginalVideofile, mergeAudioVideofile } from '../../video-transcoding'
 import { Notifier } from '../../notifier'
 import { CONFIG } from '../../../initializers/config'
 
-export type VideoTranscodingPayload = {
+interface BaseTranscodingPayload {
   videoUUID: string
-  resolution?: VideoResolution
   isNewVideo?: boolean
+}
+
+interface HLSTranscodingPayload extends BaseTranscodingPayload {
+  type: 'hls'
+  isPortraitMode?: boolean
+  resolution: VideoResolution
+}
+
+interface NewResolutionTranscodingPayload extends BaseTranscodingPayload {
+  type: 'new-resolution'
   isPortraitMode?: boolean
-  generateHlsPlaylist?: boolean
+  resolution: VideoResolution
+}
+
+interface MergeAudioTranscodingPayload extends BaseTranscodingPayload {
+  type: 'merge-audio'
+  resolution: VideoResolution
+}
+
+interface OptimizeTranscodingPayload extends BaseTranscodingPayload {
+  type: 'optimize'
 }
 
+export type VideoTranscodingPayload = HLSTranscodingPayload | NewResolutionTranscodingPayload
+  | OptimizeTranscodingPayload | MergeAudioTranscodingPayload
+
 async function processVideoTranscoding (job: Bull.Job) {
   const payload = job.data as VideoTranscodingPayload
   logger.info('Processing video file in job %d.', job.id)
@@ -31,14 +52,18 @@ async function processVideoTranscoding (job: Bull.Job) {
     return undefined
   }
 
-  if (payload.generateHlsPlaylist) {
+  if (payload.type === 'hls') {
     await generateHlsPlaylist(video, payload.resolution, payload.isPortraitMode || false)
 
     await retryTransactionWrapper(onHlsPlaylistGenerationSuccess, video)
-  } else if (payload.resolution) { // Transcoding in other resolution
+  } else if (payload.type === 'new-resolution') {
     await transcodeOriginalVideofile(video, payload.resolution, payload.isPortraitMode || false)
 
-    await retryTransactionWrapper(publishVideoIfNeeded, video, payload)
+    await retryTransactionWrapper(publishNewResolutionIfNeeded, video, payload)
+  } else if (payload.type === 'merge-audio') {
+    await mergeAudioVideofile(video, payload.resolution)
+
+    await retryTransactionWrapper(publishNewResolutionIfNeeded, video, payload)
   } else {
     await optimizeVideofile(video)
 
@@ -62,7 +87,7 @@ async function onHlsPlaylistGenerationSuccess (video: VideoModel) {
   })
 }
 
-async function publishVideoIfNeeded (video: VideoModel, payload?: VideoTranscodingPayload) {
+async function publishNewResolutionIfNeeded (video: VideoModel, payload?: NewResolutionTranscodingPayload | MergeAudioTranscodingPayload) {
   const { videoDatabase, videoPublished } = await sequelizeTypescript.transaction(async t => {
     // Maybe the video changed in database, refresh it
     let videoDatabase = await VideoModel.loadAndPopulateAccountAndServerAndTags(video.uuid, t)
@@ -94,7 +119,7 @@ async function publishVideoIfNeeded (video: VideoModel, payload?: VideoTranscodi
   await createHlsJobIfEnabled(payload)
 }
 
-async function onVideoFileOptimizerSuccess (videoArg: VideoModel, payload: VideoTranscodingPayload) {
+async function onVideoFileOptimizerSuccess (videoArg: VideoModel, payload: OptimizeTranscodingPayload) {
   if (videoArg === undefined) return undefined
 
   // Outside the transaction (IO on disk)
@@ -120,6 +145,7 @@ async function onVideoFileOptimizerSuccess (videoArg: VideoModel, payload: Video
 
       for (const resolution of resolutionsEnabled) {
         const dataInput = {
+          type: 'new-resolution' as 'new-resolution',
           videoUUID: videoDatabase.uuid,
           resolution
         }
@@ -149,27 +175,27 @@ async function onVideoFileOptimizerSuccess (videoArg: VideoModel, payload: Video
   if (payload.isNewVideo) Notifier.Instance.notifyOnNewVideo(videoDatabase)
   if (videoPublished) Notifier.Instance.notifyOnVideoPublishedAfterTranscoding(videoDatabase)
 
-  await createHlsJobIfEnabled(Object.assign({}, payload, { resolution: videoDatabase.getOriginalFile().resolution }))
+  const hlsPayload = Object.assign({}, payload, { resolution: videoDatabase.getOriginalFile().resolution })
+  await createHlsJobIfEnabled(hlsPayload)
 }
 
 // ---------------------------------------------------------------------------
 
 export {
   processVideoTranscoding,
-  publishVideoIfNeeded
+  publishNewResolutionIfNeeded
 }
 
 // ---------------------------------------------------------------------------
 
-function createHlsJobIfEnabled (payload?: VideoTranscodingPayload) {
+function createHlsJobIfEnabled (payload?: { videoUUID: string, resolution: number, isPortraitMode?: boolean }) {
   // Generate HLS playlist?
   if (payload && CONFIG.TRANSCODING.HLS.ENABLED) {
     const hlsTranscodingPayload = {
+      type: 'hls' as 'hls',
       videoUUID: payload.videoUUID,
       resolution: payload.resolution,
-      isPortraitMode: payload.isPortraitMode,
-
-      generateHlsPlaylist: true
+      isPortraitMode: payload.isPortraitMode
     }
 
     return JobQueue.Instance.createJob({ type: 'video-transcoding', payload: hlsTranscodingPayload })
diff --git a/server/lib/thumbnail.ts b/server/lib/thumbnail.ts
index 950b14c3b..18bdcded4 100644
--- a/server/lib/thumbnail.ts
+++ b/server/lib/thumbnail.ts
@@ -1,7 +1,7 @@
 import { VideoFileModel } from '../models/video/video-file'
 import { generateImageFromVideoFile } from '../helpers/ffmpeg-utils'
 import { CONFIG } from '../initializers/config'
-import { PREVIEWS_SIZE, THUMBNAILS_SIZE } from '../initializers/constants'
+import { PREVIEWS_SIZE, THUMBNAILS_SIZE, ASSETS_PATH } from '../initializers/constants'
 import { VideoModel } from '../models/video/video'
 import { ThumbnailModel } from '../models/video/thumbnail'
 import { ThumbnailType } from '../../shared/models/videos/thumbnail.type'
@@ -45,8 +45,10 @@ function createVideoMiniatureFromExisting (inputPath: string, video: VideoModel,
 function generateVideoMiniature (video: VideoModel, videoFile: VideoFileModel, type: ThumbnailType) {
   const input = video.getVideoFilePath(videoFile)
 
-  const { filename, basePath, height, width, existingThumbnail } = buildMetadataFromVideo(video, type)
-  const thumbnailCreator = () => generateImageFromVideoFile(input, basePath, filename, { height, width })
+  const { filename, basePath, height, width, existingThumbnail, outputPath } = buildMetadataFromVideo(video, type)
+  const thumbnailCreator = videoFile.isAudio()
+    ? () => processImage(ASSETS_PATH.DEFAULT_AUDIO_BACKGROUND, outputPath, { width, height }, true)
+    : () => generateImageFromVideoFile(input, basePath, filename, { height, width })
 
   return createThumbnailFromFunction({ thumbnailCreator, filename, height, width, type, existingThumbnail })
 }
diff --git a/server/lib/video-transcoding.ts b/server/lib/video-transcoding.ts
index 0fe0ff12a..8d786e0ef 100644
--- a/server/lib/video-transcoding.ts
+++ b/server/lib/video-transcoding.ts
@@ -1,6 +1,6 @@
 import { HLS_STREAMING_PLAYLIST_DIRECTORY, P2P_MEDIA_LOADER_PEER_VERSION, WEBSERVER } from '../initializers/constants'
 import { join } from 'path'
-import { getVideoFileFPS, transcode } from '../helpers/ffmpeg-utils'
+import { canDoQuickTranscode, getVideoFileFPS, transcode, TranscodeOptions, TranscodeOptionsType } from '../helpers/ffmpeg-utils'
 import { ensureDir, move, remove, stat } from 'fs-extra'
 import { logger } from '../helpers/logger'
 import { VideoResolution } from '../../shared/models/videos'
@@ -11,15 +11,24 @@ import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-pla
 import { VideoStreamingPlaylistType } from '../../shared/models/videos/video-streaming-playlist.type'
 import { CONFIG } from '../initializers/config'
 
+/**
+ * Optimize the original video file and replace it. The resolution is not changed.
+ */
 async function optimizeVideofile (video: VideoModel, inputVideoFileArg?: VideoFileModel) {
   const videosDirectory = CONFIG.STORAGE.VIDEOS_DIR
+  const transcodeDirectory = CONFIG.STORAGE.TMP_DIR
   const newExtname = '.mp4'
 
   const inputVideoFile = inputVideoFileArg ? inputVideoFileArg : video.getOriginalFile()
   const videoInputPath = join(videosDirectory, video.getVideoFilename(inputVideoFile))
-  const videoTranscodedPath = join(videosDirectory, video.id + '-transcoded' + newExtname)
+  const videoTranscodedPath = join(transcodeDirectory, video.id + '-transcoded' + newExtname)
 
-  const transcodeOptions = {
+  const transcodeType: TranscodeOptionsType = await canDoQuickTranscode(videoInputPath)
+    ? 'quick-transcode'
+    : 'video'
+
+  const transcodeOptions: TranscodeOptions = {
+    type: transcodeType as any, // FIXME: typing issue
     inputPath: videoInputPath,
     outputPath: videoTranscodedPath,
     resolution: inputVideoFile.resolution
@@ -32,18 +41,11 @@ async function optimizeVideofile (video: VideoModel, inputVideoFileArg?: VideoFi
     await remove(videoInputPath)
 
     // Important to do this before getVideoFilename() to take in account the new file extension
-    inputVideoFile.set('extname', newExtname)
+    inputVideoFile.extname = newExtname
 
     const videoOutputPath = video.getVideoFilePath(inputVideoFile)
-    await move(videoTranscodedPath, videoOutputPath)
-    const stats = await stat(videoOutputPath)
-    const fps = await getVideoFileFPS(videoOutputPath)
 
-    inputVideoFile.set('size', stats.size)
-    inputVideoFile.set('fps', fps)
-
-    await video.createTorrentAndSetInfoHash(inputVideoFile)
-    await inputVideoFile.save()
+    await onVideoFileTranscoding(video, inputVideoFile, videoTranscodedPath, videoOutputPath)
   } catch (err) {
     // Auto destruction...
     video.destroy().catch(err => logger.error('Cannot destruct video after transcoding failure.', { err }))
@@ -52,8 +54,12 @@ async function optimizeVideofile (video: VideoModel, inputVideoFileArg?: VideoFi
   }
 }
 
+/**
+ * Transcode the original video file to a lower resolution.
+ */
 async function transcodeOriginalVideofile (video: VideoModel, resolution: VideoResolution, isPortrait: boolean) {
   const videosDirectory = CONFIG.STORAGE.VIDEOS_DIR
+  const transcodeDirectory = CONFIG.STORAGE.TMP_DIR
   const extname = '.mp4'
 
   // We are sure it's x264 in mp4 because optimizeOriginalVideofile was already executed
@@ -66,27 +72,49 @@ async function transcodeOriginalVideofile (video: VideoModel, resolution: VideoR
     videoId: video.id
   })
   const videoOutputPath = join(CONFIG.STORAGE.VIDEOS_DIR, video.getVideoFilename(newVideoFile))
+  const videoTranscodedPath = join(transcodeDirectory, video.getVideoFilename(newVideoFile))
 
   const transcodeOptions = {
+    type: 'video' as 'video',
     inputPath: videoInputPath,
-    outputPath: videoOutputPath,
+    outputPath: videoTranscodedPath,
     resolution,
     isPortraitMode: isPortrait
   }
 
   await transcode(transcodeOptions)
 
-  const stats = await stat(videoOutputPath)
-  const fps = await getVideoFileFPS(videoOutputPath)
+  return onVideoFileTranscoding(video, newVideoFile, videoTranscodedPath, videoOutputPath)
+}
+
+async function mergeAudioVideofile (video: VideoModel, resolution: VideoResolution) {
+  const videosDirectory = CONFIG.STORAGE.VIDEOS_DIR
+  const transcodeDirectory = CONFIG.STORAGE.TMP_DIR
+  const newExtname = '.mp4'
+
+  const inputVideoFile = video.getOriginalFile()
 
-  newVideoFile.set('size', stats.size)
-  newVideoFile.set('fps', fps)
+  const audioInputPath = join(videosDirectory, video.getVideoFilename(video.getOriginalFile()))
+  const videoTranscodedPath = join(transcodeDirectory, video.id + '-transcoded' + newExtname)
 
-  await video.createTorrentAndSetInfoHash(newVideoFile)
+  const transcodeOptions = {
+    type: 'merge-audio' as 'merge-audio',
+    inputPath: video.getPreview().getPath(),
+    outputPath: videoTranscodedPath,
+    audioPath: audioInputPath,
+    resolution
+  }
+
+  await transcode(transcodeOptions)
 
-  await newVideoFile.save()
+  await remove(audioInputPath)
 
-  video.VideoFiles.push(newVideoFile)
+  // Important to do this before getVideoFilename() to take in account the new file extension
+  inputVideoFile.extname = newExtname
+
+  const videoOutputPath = video.getVideoFilePath(inputVideoFile)
+
+  return onVideoFileTranscoding(video, inputVideoFile, videoTranscodedPath, videoOutputPath)
 }
 
 async function generateHlsPlaylist (video: VideoModel, resolution: VideoResolution, isPortraitMode: boolean) {
@@ -97,6 +125,7 @@ async function generateHlsPlaylist (video: VideoModel, resolution: VideoResoluti
   const outputPath = join(baseHlsDirectory, VideoStreamingPlaylistModel.getHlsPlaylistFilename(resolution))
 
   const transcodeOptions = {
+    type: 'hls' as 'hls',
     inputPath: videoInputPath,
     outputPath,
     resolution,
@@ -125,8 +154,34 @@ async function generateHlsPlaylist (video: VideoModel, resolution: VideoResoluti
   })
 }
 
+// ---------------------------------------------------------------------------
+
 export {
   generateHlsPlaylist,
   optimizeVideofile,
-  transcodeOriginalVideofile
+  transcodeOriginalVideofile,
+  mergeAudioVideofile
+}
+
+// ---------------------------------------------------------------------------
+
+async function onVideoFileTranscoding (video: VideoModel, videoFile: VideoFileModel, transcodingPath: string, outputPath: string) {
+  const stats = await stat(transcodingPath)
+  const fps = await getVideoFileFPS(transcodingPath)
+
+  await move(transcodingPath, outputPath)
+
+  videoFile.set('size', stats.size)
+  videoFile.set('fps', fps)
+
+  await video.createTorrentAndSetInfoHash(videoFile)
+
+  const updatedVideoFile = await videoFile.save()
+
+  // Add it if this is a new created file
+  if (video.VideoFiles.some(f => f.id === videoFile.id) === false) {
+    video.VideoFiles.push(updatedVideoFile)
+  }
+
+  return video
 }