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• How can I extract "GROUP-ID", "LANGUAGE" and "INSTREAM-ID" from ts using ffmpeg

  21 novembre 2020, par user1163234

  I am trying to get the captions from a segment from a live feed. I am running the command

  


  ffmpeg -i seg-1077853030-v1-a1.ts

  


  Output

  


  `Input #0, mpegts, from 'seg-109853030-v1-a1.ts' :
Duration : 00:00:06.01, start : 57867.901133, bitrate : 2649 kb/s
Program 1

  


  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 98 kb/s
Stream #0:2[0x102]: Data: timed_id3 (ID3  / 0x20334449)`


  


  My question is what command should I run to print out the caption file with the track metadata including label and language.

  


• Ffmpeg : alternating audio languages in resulting movie for language learning

  20 novembre 2020, par almachuar
  

  1. Need to convert multiple-(audio)-language-video to single-audio-stream-video where 2 languages alternate repeatedly.
(10sec Lang2) + (15sec Lang3) + (10sec Lang2) + (15sec Lang3) + ... and so on till the end.
I assume it should be done with piping in and changing audio streams. (I've read ffmpeg piping documentation but didn't quite understand it).

  


  


  I've done audio switching task (with scripting on Windows) by lively changing audio languages in video player but need better and crossplatform solution for little kid - preprepared video.

  


  

  2. If possible, to adjust loudness of one of the input audio streams to the other.

  


  


  P.S. Think it would be useful for many married (programmers) to show little kids bilingual cartoons. (To prepare for language learning). By balancing 10/15 sec you may retain kid's attention — the older they grow the more native language they demand.

  


  Irrelevant, just for what's my experience :
  
%ffmpeg% -y -f concat -safe 0 -i %playlist% -i %picture% -map:v 0 -map:v 1 -c:v copy -disposition:v:0 attached_pic -ac 1 -af aresample=resampler=soxr -ar 16000 -%title% -%album% -%artist% %lyrics% -c:a aac -q:a 1 %output%

  


• FFMPEG : how to select audio stream without language metadata

  2 décembre 2020, par riofly

  I have some source Video files with one or more audio streams inside.
  
I would to encode each source file with Italian language. Then I can do it.

  


  ffmpeg -i source-file.avi -c:v ... -c:a ... -map 0:a:m:language:ita ...


  


  But some source file has audio stream without Language metadata.
  
I look that it is possible to set Language metadata with "und" special value. Then I try to select the audio stream with this command :

  


  ffmpeg -i source-file.avi -c:v ... -c:a ... -map 0:a:m:language:ita? -map 0:a:m:language:und? ...


  


  (the " ?" char say to ffmpeg that he do not fire exception if the audio stream do not exists).
  
Unfortunatelly this command do not works... It seems that ffmpeg search the "und" language instead of search a audio stream "without" language.

  


  Video MetaData

  


  This is the video MetaData where audio stream do not have language value :

  


  Input #0, matroska,webm, from 'D:\My-Video.mkv':
  Metadata:
    title           : My-Video
    encoder         : libebml v1.3.3 + libmatroska v1.4.4
    creation_time   : 2016-01-20T16:02:03.000000Z
  Duration: 01:15:28.93, start: 0.000000, bitrate: 2775 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 50 tbc (default)
    Metadata:
      BPS             : 2387529
      BPS-eng         : 2387529
      DURATION        : 01:15:28.920000000
      DURATION-eng    : 01:15:28.920000000
      NUMBER_OF_FRAMES: 113223
      NUMBER_OF_FRAMES-eng: 113223
      NUMBER_OF_BYTES : 1351616420
      NUMBER_OF_BYTES-eng: 1351616420
      _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-20 16:02:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-20 16:02:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
    Metadata:
      BPS             : 384000
      BPS-eng         : 384000
      DURATION        : 01:15:28.928000000
      DURATION-eng    : 01:15:28.928000000
      NUMBER_OF_FRAMES: 141529
      NUMBER_OF_FRAMES-eng: 141529
      NUMBER_OF_BYTES : 217388544
      NUMBER_OF_BYTES-eng: 217388544
      _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-20 16:02:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-20 16:02:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(ita): Subtitle: dvd_subtitle, 720x576 (default)
    Metadata:
      BPS             : 2218
      BPS-eng         : 2218
      DURATION        : 01:09:57.232000000
      DURATION-eng    : 01:09:57.232000000
      NUMBER_OF_FRAMES: 965
      NUMBER_OF_FRAMES-eng: 965
      NUMBER_OF_BYTES : 1163769
      NUMBER_OF_BYTES-eng: 1163769
      _STATISTICS_WRITING_APP: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.7.0 ('All of the above') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-20 16:02:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-20 16:02:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES


  


  Can someone help me ?
  
Thanks !