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• Audio is not playing properly in ffmpeg player

  23 septembre 2013, par user1241903

  I need to create a player which will decrypt the input on-fly and play the content.
  I have choosen ffmpeg libs (libav*) to create player and to start I have followed this link

  but audio is not playing properly,video is playing fine.
  I am using ubuntu 12.04LTS 64bit OS with the following ffmpeg version,

  admin@vz-X401A1:~$ ffmpeg 
  
  ffmpeg version 2.0 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Sep 11 2013 13:46:26 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=/home/admin/ffmpeg_build --extra-cflags=-I/home/admin/ffmpeg_build/include --extra-ldflags=-L/home/admin/ffmpeg_build/lib --bindir=/home/admin/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 43.100 / 52. 43.100
  
    libavcodec     55. 31.101 / 55. 31.101
  
    libavformat    55. 16.102 / 55. 16.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 84.100 /  3. 84.100
  
    libswscale      2.  5.100 /  2.  5.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
  
  
  
  Use -h to get full help or, even better, run 'man ffmpeg'
  
  admin@vz-X401A1:~$

  and downloaded tutorial07.c from this link

  still, with this also, sound is not playing properly.

  I need help to solve the following issues,

  1. How can I fix this audio issue(I have gone through similar question in StackOverflow and installed old ver. of ffmpeg, but issue still remains).

  2. And also suggest some steps or tutorial, how to implement on-fly decryption process (in C) and integrate this with the player.

• How to loop an audio track and mix it with another audio track using ffmpeg

  24 août 2023, par Sa Mei

  I want to loop an audio track and set loop interval.
After that mix it with another audio track using ffmpeg.
Of course, I hope this can be finished by one command line with ffmpeg.

  


  I don't know how to use filter to do it.

  


• FFmpeg : When I ignore audio 1 and transcode audio 2 to aac I get vorbis. Is this a bug in FFmpeg ? [closed]

  26 septembre 2024, par CA Opa

  I have videos with 2 audio tracks. I don't want to copy or transcode audio track 1. I only want to copy video, transcode audio track 2 and copy subtitles using FFmpeg. When I -map track 2 (-map 0:a:1) and transcode to aac the result I get is not aac but vorbis. What is wrong with my program code ?

  


  Here is my code :

  


  "ffmpeg.exe" -i "U:\infile.mkv" -map 0:v:0 -c:v:0 copy -map 0:a:1 -c:a:1 aac -ac:a:1 2 -b:a:1 192000 -map 0:s:0 -c:s copy "U:\Outfile.mkv"


  


  This is what happens :

  


    Stream #0:0(eng): Video: h264 (High), yuv420p(tv, bt709/unknown/unknown, progressive), 1278x720 [SAR 1:1 DAR 71:40], 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(rus): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default)
      Metadata:
        title           : Многоголосый закадровый, студия "Селена Интернешнл"
  Stream #0:2(eng): Audio: flac, 48000 Hz, stereo, s16
  Stream #0:3(eng): Subtitle: subrip (srt)
[out#0/matroska @ 000001b979895440] Codec AVOption b:a:1 (set bitrate (in bits/s)) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some decoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (flac (native) -> vorbis (libvorbis))
  Stream #0:3 -> #0:2 (copy)
Press [q] to stop, [?] for help
Output #0, matroska, to 'U:\Outfile.mkv':
  Metadata:
    encoder         : Lavf61.5.101
  Chapters:
    Chapter #0:0: start 0.000000, end 180.000000
      Metadata:
        title           : On a Cold Night...
  Stream #0:0(eng): Video: h264 (High) (H264 / 0x34363248), yuv420p(tv, bt709/unknown/unknown, progressive), 1278x720 [SAR 1:1 DAR 71:40], q=2-31, 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(eng): Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, fltp
      Metadata:
        encoder         : Lavc61.11.100 libvorbis
  Stream #0:2(eng): Subtitle: subrip
[out#0/matroska @ 000001b979895440] video:174005KiB audio:1635KiB subtitle:1KiB other streams:0KiB global headers:4KiB muxing overhead: 0.059971%


  


  If I transcode both audio tracks it succeeds.

  


  "ffmpeg.exe" -i "infile.mkv" -map 0:v:0 -c:v:0 copy -map 0:a:0 -c:a:0 aac -ac:a:0 2 -b:a:0 192000 -map 0:a:1 -c:a:1 aac -ac:a:1 2 -b:a:1 192000 -map 0:s:0 -c:s copy "Outfile.mkv"


  


  If I just transcoding track 1 it works. Why does it fail when I only map audio track 2 ?