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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 ?

  


• Start service with start-stop-daemon on Ubuntu 16.04 with timeout

  26 février 2018, par Topper

  I have /etc/init.d/stream proces with start/stop/restart options.
  It’s run ffmpeg with daemon options taken from /etc/default/stream DAEMON_OPTIONS.
  Start at background (-b) crate pid (/var/run/stream/stream.pid) etc.

  How could I add timeout 60 seconds to be sure that stream will be forcebly stopped if exceed 60 sek. timeout ?

  Can’t run "—exec timeout 60 ffmpeg" because service runs only timeout command.

  I’m I missing something or try to use wrong command ?

• how to overlay 2 videos to main video and also set delay for the videos ? [duplicate]

  23 février 2021, par Siva Kumar

  i'm new to ffmpeg and still learning. I want to add a overlay of 2 videos to my main video. one is a logo/text animation video and the other is a like,subscribe etc button video. And i want them to show on a specific time i set them but have no idea how to do this.

  


  Also i want to position them to where i want them to appear and size as well. Can someone guide me on this. I read some articles but not sure how to get it done or what number i should change etc.
ffmpeg. One link showed something like this but i don't think this will work for my situation and on what i want to do like i can't set the time delay whwen to start and add another video. In total there is 3 videos. main and 2 videos or option to add another one. Thanks alot

  


  ffmpeg -i bg.avi -itsoffset 2 -i over.avi -filter_complex overlay out.avi