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• 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=

  


  


• Anomalie #4529 : Graphes qui ne remplissent pas la page sur exec=stats_visites

  12 mars 2021

  Il a l’air bien Echarts, mais je ne pense pas qu’on ait besoin du PHP nécessairement.

  Dans l’histoire de cette page, il y avait l’idée d’avoir toujours accès aux données sous forme écrites (tables html).
  Je préfèrerais partir sur d3js pour ma part, simplement parce que certaines connaissances pourraient nous aider dessus. J’ai vaguement l’impression que d3 peut facilement analyser le html (ici nos tables) et en extraire des données pertinentes.

  Ceci dit (propos de Fil mal retranscrites de mémoire de ma tête) il y aurait des données à analyser et à rendre plus intéressantes visuellement sur cette page (quel article du site buzz en ce moment, ou la semaine dernière ? et d’où en venaient les gens) (et plein de choses forcément que j’ai oublié).