Custom video transcode FPS

README.md

@@ -54,7 +54,7 @@ Build and push this container to ghcr
 - [ ] change from Audio -> Video
 - [x] Provide a better name for downloaded files
 - [x] Environment variable to control whether "Secure" flag set on cookie
-- [ ] Allow custom FPS for video transcode
+- [x] Allow custom FPS for video transcode
 - [ ] Provide an about page
   - `ffmpeg` version
   - `yt-dlp` version

handlers.go

@@ -486,13 +486,14 @@ func addAudioTranscode(mediaId, originalId, bitrate uint, srcKind string) {
 	db.Create(&t)
 }
 
-func addVideoTranscode(videoId, originalId, targetHeight uint) {
+func addVideoTranscode(videoId, originalId, targetHeight uint, targetFPS float64) {
 	t := Transcode{
 		SrcID:      videoId,
 		OriginalID: originalId,
 		SrcKind:    "video",
 		DstKind:    "video",
 		Height:     targetHeight,
+		FPS:        targetFPS,
 		TimeSubmit: time.Now(),
 		Status:     "pending",
 	}
@@ -532,7 +533,7 @@ func processOriginal(originalID uint) {
 		// create video transcodes
 		for _, targetHeight := range []uint{480, 240, 144} {
 			if targetHeight <= video.Height {
-				addVideoTranscode(video.ID, originalID, targetHeight)
+				addVideoTranscode(video.ID, originalID, targetHeight, video.FPS)
 				break
 			}
 		}
@@ -1045,6 +1046,7 @@ func deleteAudioHandler(c echo.Context) error {
 func transcodeToVideoHandler(c echo.Context) error {
 	originalId, _ := strconv.ParseUint(c.FormValue("original_id"), 10, 32)
 	height, _ := strconv.ParseUint(c.FormValue("height"), 10, 32)
+	fps, _ := strconv.ParseFloat(c.FormValue("fps"), 64)
 	referrer := c.Request().Referer()
 	if referrer == "" {
 		referrer = "/"
@@ -1055,7 +1057,7 @@ func transcodeToVideoHandler(c echo.Context) error {
 	if err == gorm.ErrRecordNotFound {
 		log.Errorf("no video record for original %d: %v", originalId, err)
 	} else {
-		addVideoTranscode(video.ID, uint(originalId), uint(height))
+		addVideoTranscode(video.ID, uint(originalId), uint(height), fps)
 	}
 
 	return c.Redirect(http.StatusSeeOther, referrer)

models.go

@@ -25,7 +25,7 @@ type Transcode struct {
 	// video fields
 	Height uint    // target height
 	Width  uint    // target width
-	FPS    uint // target FPS
+	FPS    float64 // target FPS
 
 	// audio & video fields
 	Rate uint

templates/video.html

@@ -55,6 +55,7 @@
                         <option value="24">24 fps</option>
                         <option value="25">25 fps</option>
                         <option value="30">30 fps</option>
+                        <option value="59.94">59.94 fps</option>
                         <option value="60">60 fps</option>
                     </select>
                 </div>

workers.go

@@ -19,7 +19,7 @@ func ensureDirFor(path string) error {
 	return os.MkdirAll(dir, 0700)
 }
 
-func videoToVideo(transID uint, height uint, srcFilepath string) {
+func videoToVideo(transID uint, height uint, fps float64, srcFilepath string) {
 
 	// determine destination path
 	dstFilename := uuid.Must(uuid.NewV7()).String()
@@ -47,8 +47,14 @@ func videoToVideo(transID uint, height uint, srcFilepath string) {
 
 	// start ffmpeg
 	db.Model(&Transcode{}).Where("id = ?", transID).Update("status", "running")
+	var vf string
+	if fps > 0 {
+		vf = fmt.Sprintf("scale=-2:%d,fps=%f", height, fps)
+	} else {
+		vf = fmt.Sprintf("scale=-2:%d", height)
+	}
 	stdout, stderr, err := ffmpeg.Ffmpeg("-i", srcFilepath,
-		"-vf", fmt.Sprintf("scale=-2:%d", height), "-c:v", "libx264",
+		"-vf", vf, "-c:v", "libx264",
 		"-crf", "23", "-preset", "veryfast", "-c:a", "aac", "-b:a", fmt.Sprintf("%dk", audioBitrate),
 		dstFilepath)
 	if err != nil {
@@ -258,7 +264,7 @@ func transcodePending() {
 			srcFilepath := filepath.Join(getDataDir(), srcVideo.Filename)
 
 			if trans.DstKind == "video" {
-				videoToVideo(trans.ID, trans.Height, srcFilepath)
+				videoToVideo(trans.ID, trans.Height, trans.FPS, srcFilepath)
 			} else if trans.DstKind == "audio" {
 				videoToAudio(trans.ID, trans.Rate, srcFilepath)
 			} else {