17 files changed, 183 insertions, 107 deletions

diff --git a/server/controllers/api/videos/captions.ts b/server/controllers/api/videos/captions.ts
index bf82e2c19..ad7423a31 100644
--- a/server/controllers/api/videos/captions.ts
+++ b/server/controllers/api/videos/captions.ts
@@ -1,17 +1,17 @@
 import * as express from 'express'
-import { asyncMiddleware, asyncRetryTransactionMiddleware, authenticate } from '../../../middlewares'
-import { addVideoCaptionValidator, deleteVideoCaptionValidator, listVideoCaptionsValidator } from '../../../middlewares/validators'
+import { MVideoCaption } from '@server/types/models'
+import { HttpStatusCode } from '../../../../shared/core-utils/miscs/http-error-codes'
+import { moveAndProcessCaptionFile } from '../../../helpers/captions-utils'
 import { createReqFiles } from '../../../helpers/express-utils'
-import { MIMETYPES } from '../../../initializers/constants'
-import { getFormattedObjects } from '../../../helpers/utils'
-import { VideoCaptionModel } from '../../../models/video/video-caption'
 import { logger } from '../../../helpers/logger'
-import { federateVideoIfNeeded } from '../../../lib/activitypub/videos'
-import { moveAndProcessCaptionFile } from '../../../helpers/captions-utils'
+import { getFormattedObjects } from '../../../helpers/utils'
 import { CONFIG } from '../../../initializers/config'
+import { MIMETYPES } from '../../../initializers/constants'
 import { sequelizeTypescript } from '../../../initializers/database'
-import { MVideoCaptionVideo } from '@server/types/models'
-import { HttpStatusCode } from '../../../../shared/core-utils/miscs/http-error-codes'
+import { federateVideoIfNeeded } from '../../../lib/activitypub/videos'
+import { asyncMiddleware, asyncRetryTransactionMiddleware, authenticate } from '../../../middlewares'
+import { addVideoCaptionValidator, deleteVideoCaptionValidator, listVideoCaptionsValidator } from '../../../middlewares/validators'
+import { VideoCaptionModel } from '../../../models/video/video-caption'
 
 const reqVideoCaptionAdd = createReqFiles(
   [ 'captionfile' ],
@@ -57,17 +57,19 @@ async function addVideoCaption (req: express.Request, res: express.Response) {
   const videoCaptionPhysicalFile = req.files['captionfile'][0]
   const video = res.locals.videoAll
 
+  const captionLanguage = req.params.captionLanguage
+
   const videoCaption = new VideoCaptionModel({
     videoId: video.id,
-    language: req.params.captionLanguage
-  }) as MVideoCaptionVideo
-  videoCaption.Video = video
+    filename: VideoCaptionModel.generateCaptionName(captionLanguage),
+    language: captionLanguage
+  }) as MVideoCaption
 
   // Move physical file
   await moveAndProcessCaptionFile(videoCaptionPhysicalFile, videoCaption)
 
   await sequelizeTypescript.transaction(async t => {
-    await VideoCaptionModel.insertOrReplaceLanguage(video.id, req.params.captionLanguage, null, t)
+    await VideoCaptionModel.insertOrReplaceLanguage(videoCaption, t)
 
     // Update video update
     await federateVideoIfNeeded(video, false, t)
diff --git a/server/controllers/api/videos/import.ts b/server/controllers/api/videos/import.ts
index 01f41e7bc..c689cb6f9 100644
--- a/server/controllers/api/videos/import.ts
+++ b/server/controllers/api/videos/import.ts
@@ -9,9 +9,9 @@ import {
   MThumbnail,
   MUser,
   MVideoAccountDefault,
-  MVideoCaptionVideo,
+  MVideoCaption,
   MVideoTag,
-  MVideoThumbnailAccountDefault,
+  MVideoThumbnail,
   MVideoWithBlacklistLight
 } from '@server/types/models'
 import { MVideoImport, MVideoImportFormattable } from '@server/types/models/video/video-import'
@@ -154,20 +154,16 @@ async function addYoutubeDLImport (req: express.Request, res: express.Response)
 
   const video = buildVideo(res.locals.videoChannel.id, body, youtubeDLInfo)
 
-  let thumbnailModel: MThumbnail
-
   // Process video thumbnail from request.files
-  thumbnailModel = await processThumbnail(req, video)
+  let thumbnailModel = await processThumbnail(req, video)
 
   // Process video thumbnail from url if processing from request.files failed
   if (!thumbnailModel && youtubeDLInfo.thumbnailUrl) {
     thumbnailModel = await processThumbnailFromUrl(youtubeDLInfo.thumbnailUrl, video)
   }
 
-  let previewModel: MThumbnail
-
   // Process video preview from request.files
-  previewModel = await processPreview(req, video)
+  let previewModel = await processPreview(req, video)
 
   // Process video preview from url if processing from request.files failed
   if (!previewModel && youtubeDLInfo.thumbnailUrl) {
@@ -199,15 +195,15 @@ async function addYoutubeDLImport (req: express.Request, res: express.Response)
     for (const subtitle of subtitles) {
       const videoCaption = new VideoCaptionModel({
         videoId: video.id,
-        language: subtitle.language
-      }) as MVideoCaptionVideo
-      videoCaption.Video = video
+        language: subtitle.language,
+        filename: VideoCaptionModel.generateCaptionName(subtitle.language)
+      }) as MVideoCaption
 
       // Move physical file
       await moveAndProcessCaptionFile(subtitle, videoCaption)
 
       await sequelizeTypescript.transaction(async t => {
-        await VideoCaptionModel.insertOrReplaceLanguage(video.id, subtitle.language, null, t)
+        await VideoCaptionModel.insertOrReplaceLanguage(videoCaption, t)
       })
     }
   } catch (err) {
@@ -227,7 +223,7 @@ async function addYoutubeDLImport (req: express.Request, res: express.Response)
   return res.json(videoImport.toFormattedJSON()).end()
 }
 
-function buildVideo (channelId: number, body: VideoImportCreate, importData: YoutubeDLInfo) {
+function buildVideo (channelId: number, body: VideoImportCreate, importData: YoutubeDLInfo): MVideoThumbnail {
   const videoData = {
     name: body.name || importData.name || 'Unknown name',
     remote: false,
@@ -252,7 +248,7 @@ function buildVideo (channelId: number, body: VideoImportCreate, importData: You
   return video
 }
 
-async function processThumbnail (req: express.Request, video: VideoModel) {
+async function processThumbnail (req: express.Request, video: MVideoThumbnail) {
   const thumbnailField = req.files ? req.files['thumbnailfile'] : undefined
   if (thumbnailField) {
     const thumbnailPhysicalFile = thumbnailField[0]
@@ -268,7 +264,7 @@ async function processThumbnail (req: express.Request, video: VideoModel) {
   return undefined
 }
 
-async function processPreview (req: express.Request, video: VideoModel) {
+async function processPreview (req: express.Request, video: MVideoThumbnail): Promise<MThumbnail> {
   const previewField = req.files ? req.files['previewfile'] : undefined
   if (previewField) {
     const previewPhysicalFile = previewField[0]
@@ -284,7 +280,7 @@ async function processPreview (req: express.Request, video: VideoModel) {
   return undefined
 }
 
-async function processThumbnailFromUrl (url: string, video: VideoModel) {
+async function processThumbnailFromUrl (url: string, video: MVideoThumbnail) {
   try {
     return createVideoMiniatureFromUrl(url, video, ThumbnailType.MINIATURE)
   } catch (err) {
@@ -293,7 +289,7 @@ async function processThumbnailFromUrl (url: string, video: VideoModel) {
   }
 }
 
-async function processPreviewFromUrl (url: string, video: VideoModel) {
+async function processPreviewFromUrl (url: string, video: MVideoThumbnail) {
   try {
     return createVideoMiniatureFromUrl(url, video, ThumbnailType.PREVIEW)
   } catch (err) {
@@ -303,7 +299,7 @@ async function processPreviewFromUrl (url: string, video: VideoModel) {
 }
 
 function insertIntoDB (parameters: {
-  video: MVideoThumbnailAccountDefault
+  video: MVideoThumbnail
   thumbnailModel: MThumbnail
   previewModel: MThumbnail
   videoChannel: MChannelAccountDefault
diff --git a/server/controllers/lazy-static.ts b/server/controllers/lazy-static.ts
index 847d24fd4..656dea223 100644
--- a/server/controllers/lazy-static.ts
+++ b/server/controllers/lazy-static.ts
@@ -23,7 +23,7 @@ lazyStaticRouter.use(
 )
 
 lazyStaticRouter.use(
-  LAZY_STATIC_PATHS.VIDEO_CAPTIONS + ':videoId-:captionLanguage([a-z]+).vtt',
+  LAZY_STATIC_PATHS.VIDEO_CAPTIONS + ':filename',
   asyncMiddleware(getVideoCaption)
 )
 
@@ -78,10 +78,7 @@ async function getPreview (req: express.Request, res: express.Response) {
 }
 
 async function getVideoCaption (req: express.Request, res: express.Response) {
-  const result = await VideosCaptionCache.Instance.getFilePath({
-    videoId: req.params.videoId,
-    language: req.params.captionLanguage
-  })
+  const result = await VideosCaptionCache.Instance.getFilePath(req.params.filename)
   if (!result) return res.sendStatus(HttpStatusCode.NOT_FOUND_404)
 
   return res.sendFile(result.path, { maxAge: STATIC_MAX_AGE.SERVER })
diff --git a/server/helpers/captions-utils.ts b/server/helpers/captions-utils.ts
index 7cbfb3561..401f2fb7b 100644
--- a/server/helpers/captions-utils.ts
+++ b/server/helpers/captions-utils.ts
@@ -1,12 +1,12 @@
+import { createReadStream, createWriteStream, move, remove } from 'fs-extra'
 import { join } from 'path'
-import { CONFIG } from '../initializers/config'
 import * as srt2vtt from 'srt-to-vtt'
-import { createReadStream, createWriteStream, move, remove } from 'fs-extra'
-import { MVideoCaptionFormattable } from '@server/types/models'
+import { MVideoCaption } from '@server/types/models'
+import { CONFIG } from '../initializers/config'
 
-async function moveAndProcessCaptionFile (physicalFile: { filename: string, path: string }, videoCaption: MVideoCaptionFormattable) {
+async function moveAndProcessCaptionFile (physicalFile: { filename: string, path: string }, videoCaption: MVideoCaption) {
   const videoCaptionsDir = CONFIG.STORAGE.CAPTIONS_DIR
-  const destination = join(videoCaptionsDir, videoCaption.getCaptionName())
+  const destination = join(videoCaptionsDir, videoCaption.filename)
 
   // Convert this srt file to vtt
   if (physicalFile.path.endsWith('.srt')) {
@@ -17,7 +17,7 @@ async function moveAndProcessCaptionFile (physicalFile: { filename: string, path
   }
 
   // This is important in case if there is another attempt in the retry process
-  physicalFile.filename = videoCaption.getCaptionName()
+  physicalFile.filename = videoCaption.filename
   physicalFile.path = destination
 }
 
diff --git a/server/helpers/middlewares/video-captions.ts b/server/helpers/middlewares/video-captions.ts
index 10267eda1..226d3c5f8 100644
--- a/server/helpers/middlewares/video-captions.ts
+++ b/server/helpers/middlewares/video-captions.ts
@@ -9,7 +9,6 @@ async function doesVideoCaptionExist (video: MVideoId, language: string, res: Re
   if (!videoCaption) {
     res.status(HttpStatusCode.NOT_FOUND_404)
        .json({ error: 'Video caption not found' })
-       .end()
 
     return false
   }
diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index a9f7a8e58..be5db8fe8 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -24,7 +24,7 @@ import { CONFIG, registerConfigChangedHandler } from './config'
 
 // ---------------------------------------------------------------------------
 
-const LAST_MIGRATION_VERSION = 575
+const LAST_MIGRATION_VERSION = 580
 
 // ---------------------------------------------------------------------------
 
diff --git a/server/initializers/migrations/0580-caption-filename.ts b/server/initializers/migrations/0580-caption-filename.ts
new file mode 100644
index 000000000..5281fd0c0
--- /dev/null
+++ b/server/initializers/migrations/0580-caption-filename.ts
@@ -0,0 +1,48 @@
+import * as Sequelize from 'sequelize'
+
+async function up (utils: {
+  transaction: Sequelize.Transaction
+  queryInterface: Sequelize.QueryInterface
+  sequelize: Sequelize.Sequelize
+  db: any
+}): Promise<void> {
+  {
+    const data = {
+      type: Sequelize.STRING,
+      allowNull: true,
+      defaultValue: null
+    }
+
+    await utils.queryInterface.addColumn('videoCaption', 'filename', data)
+  }
+
+  {
+    const query = `UPDATE "videoCaption" SET "filename" = s.uuid || '-' || s.language || '.vtt' ` +
+    `FROM (` +
+    `  SELECT "videoCaption"."id", video.uuid, "videoCaption".language ` +
+    `  FROM "videoCaption" INNER JOIN video ON video.id = "videoCaption"."videoId"` +
+    `) AS s ` +
+    `WHERE "videoCaption".id = s.id`
+
+    await utils.sequelize.query(query)
+  }
+
+  {
+    const data = {
+      type: Sequelize.STRING,
+      allowNull: false,
+      defaultValue: null
+    }
+
+    await utils.queryInterface.changeColumn('videoCaption', 'filename', data)
+  }
+}
+
+function down (options) {
+  throw new Error('Not implemented.')
+}
+
+export {
+  up,
+  down
+}
diff --git a/server/lib/activitypub/playlist.ts b/server/lib/activitypub/playlist.ts
index 8b54a001a..53298e968 100644
--- a/server/lib/activitypub/playlist.ts
+++ b/server/lib/activitypub/playlist.ts
@@ -99,8 +99,6 @@ async function createOrUpdateVideoPlaylist (playlistObject: PlaylistObject, byAc
     return Promise.resolve()
   })
 
-  logger.info('toto', { playlist, id: playlist.id })
-
   const refreshedPlaylist = await VideoPlaylistModel.loadWithAccountAndChannel(playlist.id, null)
 
   if (playlistObject.icon) {
diff --git a/server/lib/activitypub/videos.ts b/server/lib/activitypub/videos.ts
index b5a199e67..201ef0302 100644
--- a/server/lib/activitypub/videos.ts
+++ b/server/lib/activitypub/videos.ts
@@ -56,6 +56,7 @@ import {
   MVideoAccountLightBlacklistAllFiles,
   MVideoAP,
   MVideoAPWithoutCaption,
+  MVideoCaption,
   MVideoFile,
   MVideoFullLight,
   MVideoId,
@@ -90,7 +91,7 @@ async function federateVideoIfNeeded (videoArg: MVideoAPWithoutCaption, isNewVid
     // Fetch more attributes that we will need to serialize in AP object
     if (isArray(video.VideoCaptions) === false) {
       video.VideoCaptions = await video.$get('VideoCaptions', {
-        attributes: [ 'language' ],
+        attributes: [ 'filename', 'language' ],
         transaction
       })
     }
@@ -423,7 +424,14 @@ async function updateVideoFromAP (options: {
         await VideoCaptionModel.deleteAllCaptionsOfRemoteVideo(videoUpdated.id, t)
 
         const videoCaptionsPromises = videoObject.subtitleLanguage.map(c => {
-          return VideoCaptionModel.insertOrReplaceLanguage(videoUpdated.id, c.identifier, c.url, t)
+          const caption = new VideoCaptionModel({
+            videoId: videoUpdated.id,
+            filename: VideoCaptionModel.generateCaptionName(c.identifier),
+            language: c.identifier,
+            fileUrl: c.url
+          }) as MVideoCaption
+
+          return VideoCaptionModel.insertOrReplaceLanguage(caption, t)
         })
         await Promise.all(videoCaptionsPromises)
       }
@@ -629,7 +637,14 @@ async function createVideo (videoObject: VideoObject, channel: MChannelAccountLi
 
     // Process captions
     const videoCaptionsPromises = videoObject.subtitleLanguage.map(c => {
-      return VideoCaptionModel.insertOrReplaceLanguage(videoCreated.id, c.identifier, c.url, t)
+      const caption = new VideoCaptionModel({
+        videoId: videoCreated.id,
+        filename: VideoCaptionModel.generateCaptionName(c.identifier),
+        language: c.identifier,
+        fileUrl: c.url
+      }) as MVideoCaption
+
+      return VideoCaptionModel.insertOrReplaceLanguage(caption, t)
     })
     await Promise.all(videoCaptionsPromises)
 
diff --git a/server/lib/files-cache/videos-caption-cache.ts b/server/lib/files-cache/videos-caption-cache.ts
index 26ab3bd0d..ee0447010 100644
--- a/server/lib/files-cache/videos-caption-cache.ts
+++ b/server/lib/files-cache/videos-caption-cache.ts
@@ -1,17 +1,13 @@
 import { join } from 'path'
+import { doRequestAndSaveToFile } from '@server/helpers/requests'
+import { CONFIG } from '../../initializers/config'
 import { FILES_CACHE } from '../../initializers/constants'
 import { VideoModel } from '../../models/video/video'
 import { VideoCaptionModel } from '../../models/video/video-caption'
 import { AbstractVideoStaticFileCache } from './abstract-video-static-file-cache'
-import { CONFIG } from '../../initializers/config'
-import { logger } from '../../helpers/logger'
-import { doRequestAndSaveToFile } from '@server/helpers/requests'
 
-type GetPathParam = { videoId: string, language: string }
+class VideosCaptionCache extends AbstractVideoStaticFileCache <string> {
 
-class VideosCaptionCache extends AbstractVideoStaticFileCache <GetPathParam> {
-
-  private static readonly KEY_DELIMITER = '%'
   private static instance: VideosCaptionCache
 
   private constructor () {
@@ -22,32 +18,28 @@ class VideosCaptionCache extends AbstractVideoStaticFileCache <GetPathParam> {
     return this.instance || (this.instance = new this())
   }
 
-  async getFilePathImpl (params: GetPathParam) {
-    const videoCaption = await VideoCaptionModel.loadByVideoIdAndLanguage(params.videoId, params.language)
+  async getFilePathImpl (filename: string) {
+    const videoCaption = await VideoCaptionModel.loadWithVideoByFilename(filename)
     if (!videoCaption) return undefined
 
-    if (videoCaption.isOwned()) return { isOwned: true, path: join(CONFIG.STORAGE.CAPTIONS_DIR, videoCaption.getCaptionName()) }
+    if (videoCaption.isOwned()) return { isOwned: true, path: join(CONFIG.STORAGE.CAPTIONS_DIR, videoCaption.filename) }
 
-    const key = params.videoId + VideosCaptionCache.KEY_DELIMITER + params.language
-    return this.loadRemoteFile(key)
+    return this.loadRemoteFile(filename)
   }
 
+  // Key is the caption filename
   protected async loadRemoteFile (key: string) {
-    logger.debug('Loading remote caption file %s.', key)
-
-    const [ videoId, language ] = key.split(VideosCaptionCache.KEY_DELIMITER)
-
-    const videoCaption = await VideoCaptionModel.loadByVideoIdAndLanguage(videoId, language)
+    const videoCaption = await VideoCaptionModel.loadWithVideoByFilename(key)
     if (!videoCaption) return undefined
 
     if (videoCaption.isOwned()) throw new Error('Cannot load remote caption of owned video.')
 
     // Used to fetch the path
-    const video = await VideoModel.loadAndPopulateAccountAndServerAndTags(videoId)
+    const video = await VideoModel.loadAndPopulateAccountAndServerAndTags(videoCaption.videoId)
     if (!video) return undefined
 
     const remoteUrl = videoCaption.getFileUrl(video)
-    const destPath = join(FILES_CACHE.VIDEO_CAPTIONS.DIRECTORY, videoCaption.getCaptionName())
+    const destPath = join(FILES_CACHE.VIDEO_CAPTIONS.DIRECTORY, videoCaption.filename)
 
     await doRequestAndSaveToFile({ uri: remoteUrl }, destPath)
 
diff --git a/server/lib/files-cache/videos-preview-cache.ts b/server/lib/files-cache/videos-preview-cache.ts
index 51146d718..47488da74 100644
--- a/server/lib/files-cache/videos-preview-cache.ts
+++ b/server/lib/files-cache/videos-preview-cache.ts
@@ -28,6 +28,7 @@ class VideosPreviewCache extends AbstractVideoStaticFileCache <string> {
     return this.loadRemoteFile(thumbnail.Video.uuid)
   }
 
+  // Key is the video UUID
   protected async loadRemoteFile (key: string) {
     const video = await VideoModel.loadAndPopulateAccountAndServerAndTags(key)
     if (!video) return undefined
diff --git a/server/lib/thumbnail.ts b/server/lib/thumbnail.ts
index 740b83acb..33aa7159c 100644
--- a/server/lib/thumbnail.ts
+++ b/server/lib/thumbnail.ts
@@ -166,6 +166,9 @@ async function createThumbnailFromFunction (parameters: {
 }) {
   const { thumbnailCreator, filename, width, height, type, existingThumbnail, automaticallyGenerated = null, fileUrl = null } = parameters
 
+  // Remove old file
+  if (existingThumbnail) await existingThumbnail.removeThumbnail()
+
   const thumbnail = existingThumbnail || new ThumbnailModel()
 
   thumbnail.filename = filename
diff --git a/server/models/video/video-caption.ts b/server/models/video/video-caption.ts
index e8e883dd0..a1553ea15 100644
--- a/server/models/video/video-caption.ts
+++ b/server/models/video/video-caption.ts
@@ -16,7 +16,7 @@ import {
   UpdatedAt
 } from 'sequelize-typescript'
 import { buildRemoteVideoBaseUrl } from '@server/helpers/activitypub'
-import { MVideoAccountLight, MVideoCaptionFormattable, MVideoCaptionVideo } from '@server/types/models'
+import { MVideoAccountLight, MVideoCaption, MVideoCaptionFormattable, MVideoCaptionVideo } from '@server/types/models'
 import { VideoCaption } from '../../../shared/models/videos/caption/video-caption.model'
 import { isVideoCaptionLanguageValid } from '../../helpers/custom-validators/video-captions'
 import { logger } from '../../helpers/logger'
@@ -24,6 +24,7 @@ import { CONFIG } from '../../initializers/config'
 import { CONSTRAINTS_FIELDS, LAZY_STATIC_PATHS, VIDEO_LANGUAGES, WEBSERVER } from '../../initializers/constants'
 import { buildWhereIdOrUUID, throwIfNotValid } from '../utils'
 import { VideoModel } from './video'
+import { v4 as uuidv4 } from 'uuid'
 
 export enum ScopeNames {
   WITH_VIDEO_UUID_AND_REMOTE = 'WITH_VIDEO_UUID_AND_REMOTE'
@@ -45,6 +46,10 @@ export enum ScopeNames {
   tableName: 'videoCaption',
   indexes: [
     {
+      fields: [ 'filename' ],
+      unique: true
+    },
+    {
       fields: [ 'videoId' ]
     },
     {
@@ -65,6 +70,10 @@ export class VideoCaptionModel extends Model {
   @Column
   language: string
 
+  @AllowNull(false)
+  @Column
+  filename: string
+
   @AllowNull(true)
   @Column(DataType.STRING(CONSTRAINTS_FIELDS.COMMONS.URL.max))
   fileUrl: string
@@ -88,12 +97,12 @@ export class VideoCaptionModel extends Model {
     }
 
     if (instance.isOwned()) {
-      logger.info('Removing captions %s of video %s.', instance.Video.uuid, instance.language)
+      logger.info('Removing caption %s.', instance.filename)
 
       try {
         await instance.removeCaptionFile()
       } catch (err) {
-        logger.error('Cannot remove caption file of video %s.', instance.Video.uuid)
+        logger.error('Cannot remove caption file %s.', instance.filename)
       }
     }
 
@@ -119,15 +128,28 @@ export class VideoCaptionModel extends Model {
     return VideoCaptionModel.findOne(query)
   }
 
-  static insertOrReplaceLanguage (videoId: number, language: string, fileUrl: string, transaction: Transaction) {
-    const values = {
-      videoId,
-      language,
-      fileUrl
+  static loadWithVideoByFilename (filename: string): Promise<MVideoCaptionVideo> {
+    const query = {
+      where: {
+        filename
+      },
+      include: [
+        {
+          model: VideoModel.unscoped(),
+          attributes: [ 'id', 'remote', 'uuid' ]
+        }
+      ]
     }
 
-    return VideoCaptionModel.upsert(values, { transaction, returning: true })
-      .then(([ caption ]) => caption)
+    return VideoCaptionModel.findOne(query)
+  }
+
+  static async insertOrReplaceLanguage (caption: MVideoCaption, transaction: Transaction) {
+    const existing = await VideoCaptionModel.loadByVideoIdAndLanguage(caption.videoId, caption.language)
+    // Delete existing file
+    if (existing) await existing.destroy({ transaction })
+
+    return caption.save({ transaction })
   }
 
   static listVideoCaptions (videoId: number): Promise<MVideoCaptionVideo[]> {
@@ -156,6 +178,10 @@ export class VideoCaptionModel extends Model {
     return VideoCaptionModel.destroy(query)
   }
 
+  static generateCaptionName (language: string) {
+    return `${uuidv4()}-${language}.vtt`
+  }
+
   isOwned () {
     return this.Video.remote === false
   }
@@ -170,16 +196,12 @@ export class VideoCaptionModel extends Model {
     }
   }
 
-  getCaptionStaticPath (this: MVideoCaptionFormattable) {
-    return join(LAZY_STATIC_PATHS.VIDEO_CAPTIONS, this.getCaptionName())
-  }
-
-  getCaptionName (this: MVideoCaptionFormattable) {
-    return `${this.Video.uuid}-${this.language}.vtt`
+  getCaptionStaticPath (this: MVideoCaption) {
+    return join(LAZY_STATIC_PATHS.VIDEO_CAPTIONS, this.filename)
   }
 
-  removeCaptionFile (this: MVideoCaptionFormattable) {
-    return remove(CONFIG.STORAGE.CAPTIONS_DIR + this.getCaptionName())
+  removeCaptionFile (this: MVideoCaption) {
+    return remove(CONFIG.STORAGE.CAPTIONS_DIR + this.filename)
   }
 
   getFileUrl (video: MVideoAccountLight) {
diff --git a/server/models/video/video-playlist.ts b/server/models/video/video-playlist.ts
index 93ecf8cea..9e6ff1f81 100644
--- a/server/models/video/video-playlist.ts
+++ b/server/models/video/video-playlist.ts
@@ -471,7 +471,7 @@ export class VideoPlaylistModel extends Model {
   generateThumbnailName () {
     const extension = '.jpg'
 
-    return 'playlist-' + this.uuid + extension
+    return 'playlist-' + uuidv4() + extension
   }
 
   getThumbnailUrl () {
diff --git a/server/tests/api/server/services.ts b/server/tests/api/server/services.ts
index 680e7a817..df910c111 100644
--- a/server/tests/api/server/services.ts
+++ b/server/tests/api/server/services.ts
@@ -2,24 +2,25 @@
 
 import 'mocha'
 import * as chai from 'chai'
+import { Video, VideoPlaylistPrivacy } from '@shared/models'
 import {
+  addVideoInPlaylist,
+  createVideoPlaylist,
   getOEmbed,
   getVideosList,
   ServerInfo,
   setAccessTokensToServers,
   setDefaultVideoChannel,
-  uploadVideo,
-  createVideoPlaylist,
-  addVideoInPlaylist
+  uploadVideo
 } from '../../../../shared/extra-utils'
 import { cleanupTests, flushAndRunServer } from '../../../../shared/extra-utils/server/servers'
-import { VideoPlaylistPrivacy } from '@shared/models'
 
 const expect = chai.expect
 
 describe('Test services', function () {
   let server: ServerInfo = null
   let playlistUUID: string
+  let video: Video
 
   before(async function () {
     this.timeout(30000)
@@ -36,7 +37,7 @@ describe('Test services', function () {
       await uploadVideo(server.url, server.accessToken, videoAttributes)
 
       const res = await getVideosList(server.url)
-      server.video = res.body.data[0]
+      video = res.body.data[0]
     }
 
     {
@@ -57,23 +58,23 @@ describe('Test services', function () {
         token: server.accessToken,
         playlistId: res.body.videoPlaylist.id,
         elementAttrs: {
-          videoId: server.video.id
+          videoId: video.id
         }
       })
     }
   })
 
   it('Should have a valid oEmbed video response', async function () {
-    const oembedUrl = 'http://localhost:' + server.port + '/videos/watch/' + server.video.uuid
+    const oembedUrl = 'http://localhost:' + server.port + '/videos/watch/' + video.uuid
 
     const res = await getOEmbed(server.url, oembedUrl)
     const expectedHtml = '<iframe width="560" height="315" sandbox="allow-same-origin allow-scripts" ' +
-      `src="http://localhost:${server.port}/videos/embed/${server.video.uuid}" ` +
+      `src="http://localhost:${server.port}/videos/embed/${video.uuid}" ` +
       'frameborder="0" allowfullscreen></iframe>'
-    const expectedThumbnailUrl = 'http://localhost:' + server.port + '/lazy-static/previews/' + server.video.uuid + '.jpg'
+    const expectedThumbnailUrl = 'http://localhost:' + server.port + video.previewPath
 
     expect(res.body.html).to.equal(expectedHtml)
-    expect(res.body.title).to.equal(server.video.name)
+    expect(res.body.title).to.equal(video.name)
     expect(res.body.author_name).to.equal(server.videoChannel.displayName)
     expect(res.body.width).to.equal(560)
     expect(res.body.height).to.equal(315)
@@ -101,18 +102,18 @@ describe('Test services', function () {
   })
 
   it('Should have a valid oEmbed response with small max height query', async function () {
-    const oembedUrl = 'http://localhost:' + server.port + '/videos/watch/' + server.video.uuid
+    const oembedUrl = 'http://localhost:' + server.port + '/videos/watch/' + video.uuid
     const format = 'json'
     const maxHeight = 50
     const maxWidth = 50
 
     const res = await getOEmbed(server.url, oembedUrl, format, maxHeight, maxWidth)
     const expectedHtml = '<iframe width="50" height="50" sandbox="allow-same-origin allow-scripts" ' +
-      `src="http://localhost:${server.port}/videos/embed/${server.video.uuid}" ` +
+      `src="http://localhost:${server.port}/videos/embed/${video.uuid}" ` +
       'frameborder="0" allowfullscreen></iframe>'
 
     expect(res.body.html).to.equal(expectedHtml)
-    expect(res.body.title).to.equal(server.video.name)
+    expect(res.body.title).to.equal(video.name)
     expect(res.body.author_name).to.equal(server.videoChannel.displayName)
     expect(res.body.height).to.equal(50)
     expect(res.body.width).to.equal(50)
diff --git a/server/tests/api/videos/video-captions.ts b/server/tests/api/videos/video-captions.ts
index 5b36dc021..14ecedfa6 100644
--- a/server/tests/api/videos/video-captions.ts
+++ b/server/tests/api/videos/video-captions.ts
@@ -24,6 +24,8 @@ import { VideoCaption } from '../../../../shared/models/videos/caption/video-cap
 const expect = chai.expect
 
 describe('Test video captions', function () {
+  const uuidRegex = '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'
+
   let servers: ServerInfo[]
   let videoUUID: string
 
@@ -83,13 +85,13 @@ describe('Test video captions', function () {
       const caption1: VideoCaption = res.body.data[0]
       expect(caption1.language.id).to.equal('ar')
       expect(caption1.language.label).to.equal('Arabic')
-      expect(caption1.captionPath).to.equal('/lazy-static/video-captions/' + videoUUID + '-ar.vtt')
+      expect(caption1.captionPath).to.match(new RegExp('^/lazy-static/video-captions/' + uuidRegex + '-ar.vtt$'))
       await testCaptionFile(server.url, caption1.captionPath, 'Subtitle good 1.')
 
       const caption2: VideoCaption = res.body.data[1]
       expect(caption2.language.id).to.equal('zh')
       expect(caption2.language.label).to.equal('Chinese')
-      expect(caption2.captionPath).to.equal('/lazy-static/video-captions/' + videoUUID + '-zh.vtt')
+      expect(caption2.captionPath).to.match(new RegExp('^/lazy-static/video-captions/' + uuidRegex + '-zh.vtt$'))
       await testCaptionFile(server.url, caption2.captionPath, 'Subtitle good 2.')
     }
   })
@@ -117,7 +119,7 @@ describe('Test video captions', function () {
       const caption1: VideoCaption = res.body.data[0]
       expect(caption1.language.id).to.equal('ar')
       expect(caption1.language.label).to.equal('Arabic')
-      expect(caption1.captionPath).to.equal('/lazy-static/video-captions/' + videoUUID + '-ar.vtt')
+      expect(caption1.captionPath).to.match(new RegExp('^/lazy-static/video-captions/' + uuidRegex + '-ar.vtt$'))
       await testCaptionFile(server.url, caption1.captionPath, 'Subtitle good 2.')
     }
   })
@@ -148,7 +150,7 @@ describe('Test video captions', function () {
       const caption1: VideoCaption = res.body.data[0]
       expect(caption1.language.id).to.equal('ar')
       expect(caption1.language.label).to.equal('Arabic')
-      expect(caption1.captionPath).to.equal('/lazy-static/video-captions/' + videoUUID + '-ar.vtt')
+      expect(caption1.captionPath).to.match(new RegExp('^/lazy-static/video-captions/' + uuidRegex + '-ar.vtt$'))
 
       const expected = 'WEBVTT FILE\r\n' +
         '\r\n' +
@@ -185,7 +187,7 @@ describe('Test video captions', function () {
 
       expect(caption.language.id).to.equal('zh')
       expect(caption.language.label).to.equal('Chinese')
-      expect(caption.captionPath).to.equal('/lazy-static/video-captions/' + videoUUID + '-zh.vtt')
+      expect(caption.captionPath).to.match(new RegExp('^/lazy-static/video-captions/' + uuidRegex + '-zh.vtt$'))
       await testCaptionFile(server.url, caption.captionPath, 'Subtitle good 2.')
     }
   })
diff --git a/server/types/models/video/video-caption.ts b/server/types/models/video/video-caption.ts
index ab80ff830..1f761a866 100644
--- a/server/types/models/video/video-caption.ts
+++ b/server/types/models/video/video-caption.ts
@@ -1,5 +1,5 @@
+import { PickWith } from '@shared/core-utils'
 import { VideoCaptionModel } from '../../../models/video/video-caption'
-import { FunctionProperties, PickWith } from '@shared/core-utils'
 import { MVideo, MVideoUUID } from './video'
 
 type Use<K extends keyof VideoCaptionModel, M> = PickWith<VideoCaptionModel, K, M>
@@ -22,6 +22,6 @@ export type MVideoCaptionVideo =
 // Format for API or AP object
 
 export type MVideoCaptionFormattable =
-  FunctionProperties<MVideoCaption> &
+  MVideoCaption &
   Pick<MVideoCaption, 'language'> &
   Use<'Video', MVideoUUID>