Recherche avancée

Sur d’autres sites (10188)

• lavc/hevcdec : Add slice parse support for HEVC SCC extension

  16 février 2023, par Linjie Fu

  lavc/hevcdec : Add slice parse support for HEVC SCC extension
  Signed-off-by : Linjie Fu <linjie.justin.fu@gmail.com>
  
  Signed-off-by : Fei Wang <fei.w.wang@intel.com>
  

  • [DH] libavcodec/hevcdec.c
  • [DH] libavcodec/hevcdec.h

• ffmpeg to make black video with multiple audio and subtitles [closed]

  9 septembre 2024, par Tony M

  I want to use ffmpeg to make a video with only audio and subtitles in different languages. The video part can be a simple black background. I want to be able to switch between languages in video players like QuickTime.

  


  I've tried to get help from posts like this, but I couldn't figure out how to get it to work.

  


  To demonstrate that I've worked a long time on this, I'm showing what I've come up with below — but only steps (1) & (2) work. I can't get the subtitles step (3) to work.

  


  I've used ffmpeg for a long time, but never really understood it... I've only recently started to build my own commands, so the following probably looks awful to an expert :

  


  


  1. make a silent video using

     


     ffmpeg -loop 1 -i black.jpg -i silent.mp3 -acodec copy -shortest -vf scale=1000:136 silent.mov

     


  


  


  where m.jpg is a 500x68 black image and m.mp3 has 5 min of silence

  


  


  2. add 3 language (italian, french, german) using

     


     ffmpeg -i silent.mov -i ita.mp3 -i fre.mp3 -i ger.mp3 -map 0:v -map 1:a -map 2:a -map 3:a -metadata:s:a:0 language=ita -metadata:s:a:1 language=fre -metadata:s:a:2 language=ger ita-fre-ger.mov

     


  


  3. add subtitles using (doesn't work)

     


  


  


  ffmpeg -i ita-fre-ger.mov -i ita.srt -i fre.srt -i ger.srt -map 0 -map 1 -map 2 -map 3 -c copy -c:s mov_text -metadata:s:s:0 language=ita -metadata:s:s:1 language=fre -metadata:s:s:2 language=ger final.mov

  


• How to switch between audio streams added using ffmpeg on an iPhone ?

  24 décembre 2019, par Tony M

  I have an m.mp4 with English audio and want to add a second audio stream in Italian so that I can play either language using the iPhone. When I used this command :

  ffmpeg -i m.mp4 -i ita.mp3 -c copy -map 0 -map 1 out.mp4 

  The output from ffmpeg -i out.mp4 (see below) shows that a new audio stream is added, yet when I transfer the video to the TV app and play it on either MacOS or iOS it only plays the original English and I see no options to play other languages.

  How do I get it to be able to switch between either audio ?

  Here is the output from ffmpeg -i out.mp4:

      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 400x300 [SAR 1:1 DAR 4:3], q=2-31, 482 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 102 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s
  
      Metadata:
  
        encoder         : LAME3.100
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (copy)