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Sur d’autres sites (8496)

  • ffmpeg extract first subtitle for given language or fix missmaped tracks

    11 mars 2023, par iarwain8a

    I'm using developing a server to encode any given video and I need to extract its' subtitles.

    


    I've tried something like this which worked :

    


    ffmpeg -i pipe:0 -map 0:s:1 -c:s webvtt -f segment -segment_list_flags +live -segment_time 60 -segment_list subs_eng.m3u8 -segment_format webvtt subs_eng.vtt -loglevel debug


    


    This encodes from srt, into webvtt, the second track which happens to be in this video an english subtitle. But very quickly I ran into a problem in which the tracks mappings are not numbered correctly for this video, for example, the (eng) track should be "-map 0:s:2", but it's "-map 0:s:1" as I've said before, and the (bul) track, wich should be "-map 0:s:4" is actually "-map 0:s:2".

    


    Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(eng): Audio: eac3, 48000 Hz, 5.1(side), fltp, 768 kb/s (default)
  Stream #0:2(eng): Subtitle: subrip
    Metadata:
      title           : English
  Stream #0:3(eng): Subtitle: subrip
    Metadata:
      title           : English [SDH]
  Stream #0:4(bul): Subtitle: subrip
    Metadata:
      title           : Bulgarian (Bulgaria)


    


    Given said problem I tried something like this :

    


    ffmpeg -i pipe:0 -map 0:s:m:language:eng -c:s webvtt -f segment -segment_list_flags +live -segment_time 60 -segment_list subs_eng.m3u8 -segment_format webvtt subs_eng.vtt -loglevel debug


    


    Which didn't work because I can't or don't know how, to actually select the first result of this "-map 0:s:m:language:eng" if there is more than 1 "eng" sub track. Is there a way to do this ?
Or the alternative should be : Is there a reason why the metadata of this file is missmapped ? If so is there a way to detect it, to then do something about it ? or have it fixed ?

    


  • I cant give names to subtitle tracks with ffmpeg

    11 mai 2023, par Keles

    Im using this command to add 2 audio tracks (mixed with original audio) and 2 subtitles tracks to the original video :

    


    


    ffmpeg -i input_video.mp4 -i audio_track_1.wav -i audio_track_2.wav -i
srt_file_es.srt -i srt_file_en.srt -filter_complex
"[0:a][1:a]amerge=inputs=2[a1] ;[0:a][2:a]amerge=inputs=2[a2]" -map 0:v
-map "[a1]" -metadata:s:a:0 language=spa -metadata:s:a:0 title="Spanish" -map "[a2]" -metadata:s:a:1 language=eng
-metadata:s:a:1 title="English" -c:v copy -c:a aac -ac 2 -b:a 96k -c:s mov_text -metadata:s:s:0 language=spa -metadata:s:s:0 title="Spanish"
-metadata:s:s:1 language=eng -metadata:s:s:1 title="English" output_video.mp4

    


    


    Everything works fine but the subtitles names are "Track 1" and "Track 2". The following part is not working :

    


    


    metadata:s:s:0 title=

    


    


  • can't install ffmpeg in ubuntu

    5 février 2013, par john

    I tried to install ffmpeg in ubundu.using the command sudo apt-get install ffmpeg

    But i can't install it.It Shows an error.Following is the out put when i tried to install ffmpeg.

    wds@wds:~$ sudo apt-get install ffmpeg
    
[sudo] password for wds: 
    
Reading package lists... Done
    
Building dependency tree       
    
Reading state information... Done
    
The following extra packages will be installed:
    
  libavfilter1
    
The following NEW packages will be installed:
    
  ffmpeg libavfilter1
    
0 upgraded, 2 newly installed, 0 to remove and 3 not upgraded.
    
Need to get 357kB of archives.
    
After this operation, 1,282kB of additional disk space will be used.
    
Do you want to continue [Y/n]? y
    
WARNING: The following packages cannot be authenticated!
    
  libavfilter1 ffmpeg
    
Install these packages without verification [y/N]? y
    
Err http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main libavfilter1 i386 4:0.6-2ubuntu6.3
    
  404  Not Found [IP: 91.189.91.15 80]
    
Err http://security.ubuntu.com/ubuntu/ maverick-security/main libavfilter1 i386 4:0.6-2ubuntu6.3
    
  404  Not Found [IP: 91.189.92.200 80]
    
Err http://security.ubuntu.com/ubuntu/ maverick-security/main ffmpeg i386 4:0.6-2ubuntu6.3
    
  404  Not Found [IP: 91.189.92.200 80]
    
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/f/ffmpeg/libavfilter1_0.6-2ubuntu6.3_i386.deb  404  Not Found [IP: 91.189.92.200 80]
    
Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/f/ffmpeg/ffmpeg_0.6-2ubuntu6.3_i386.deb  404  Not Found [IP: 91.189.92.200 80]
    
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
    
wds@wds:~$

    It shows a 404 error.when installing.

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