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• How to extract video with single audio channel from a ts video contain multiple audio channels in one aac audio stream ?

  11 avril 2014, par StackOverFlowMeteor

  I have a video file named "Video.ts" that contain 4 audio languages (English, Chinese, xxx, xxx).
  I want to output a video file, say "Video1.ts" (or even converted to "Video1.MP4" directly..) that contain the original video with English audio in mono ONLY.

  The ffmpeg shown the original aac audio channels were in the one stream "0:1"
  Can anyone show me the ffmpeg command line to do it ? Thanks a lot !

  C:\ffmpeg_test>ffmpeg.exe -i Video.ts
  
  
  
  Input #0, mpegts, from 'Video.ts':
  
    Duration: 00:01:11.55, start: 1.000000, bitrate: 1866 kb/s
  
    Program 1
  
  
  
  Stream #0:0[0x281]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv,
  
   bt470bg), 640x360 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  
  
  Stream #0:1[0x201]: Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, 4.0, fltp
  
  , 120 kb/s

• how can i insert an empty subtitle

  22 avril 2020, par Ginso

  i have a bunch of mp4 files and i would like to convert them to mkv, so that the automatic selection auf audio and subtitle track of vlc works.
the thing is some of them have 4 subtitles (first german and english only for foreign languages and then german and english for all) and some of them only 2 (because in those episodes there are no foreign languages). Can i insert 2 empty subtitle tracks before them so that i can set my vlc to select the first or second subtitle when i watch them ?

  



  i convert the episodes with 4 subtitles like this :

  



  ffmpeg -i in.mp4 -map 0:0 -map 0:1 -map 0:2 -map 0:3 -map 0:4 -map 0:5 -map 0:6 out.mkv

  



  0:0 is of course the video

  



  0:1 and 0:2 are audio tracks

  



  the rest are the subtitles

  



  BTW : is there a language code for forced subtitles ? -metadata:s:s:1 language=?

  


• How to create HLS video with subtitle using ffmpeg ?

  13 octobre 2022, par kakashi333

  I need to convert mp4 video and subtitles and convert it to m3u8.

  


     ffmpeg -i video.mp4 -i subtitle0.vtt -i subtitle1.vtt -c copy -c:s webvtt -c:s webvtt
    -map 0:v -map 0:a -map 1 -map 2 
    -c:v libx264 -crf 22 -c:a aac -ar 48000 
    -filter:v:0 scale=w=480:h=360  -maxrate:v:0 600k -b:a:0 500k 
    -map "1:0" "-metadata:s:s:1" "language=heb" "-metadata:s:s:1" "handler_name=Hebrew"  "-metadata:s:s:1" "title=Hebrew" 
    -map "2:0" "-metadata:s:s:2" "language=eng" "-metadata:s:s:2" "handler_name=English" "-metadata:s:s:2" "title=English" 
    -var_stream_map v:0,a:0 stream_%v.m3u8
    -preset fast -hls_list_size 10 -threads 0 -f hls 
    -hls_time 3 -hls_flags independent_segments 
    -hls_segment_filename res/data%06d.ts
    -master_pl_name livestream.m3u8
    -y livestream-%v.m3u8


  


  I've tried a lot of variants but all not working.
This is the error from the last one

  


  At least one output file must be specified