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• FFMPEG amix filter causes main audio stream to cut out

  21 janvier 2019, par user3600107

  So I have a video called 1.mkv and would like to mix in a variety of different audio clips at certain points. To do this I’m using the -filter_complex option. However, I’m running into some problems because when ffmpeg tries to mix in the first audio stream the audio works for a short while when the clip is playing and then all audio cuts out. I’m running ffmpeg version 2.8.15-0(which is up to date with my distro). Another "weird" thing about the video output is that in xplayer the video will freeze after the audio cuts out, and will work if you skip far enough ahead in the video(not sure if this is helpful but it might give some extra clues).

  Full command :

  ffmpeg -i "1.mkv" -i "5.wav" -i "2.wav" -i "3.wav" -i "6.wav" -i "7.wav" -i "4.wav" -i "9.wav" -i "8.wav" -i "10.wav" -filter_complex "[0:0]setdar=4/3[v0];
  
  
  
  [2:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=20000|20000,volume=0.5[ad2];
  
  
  
  [4:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=900000|900000,volume=0.5[ad4];
  
  
  
  [3:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=300000|300000,volume=0.5[ad3];
  
  
  
  [1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=720000|720000,volume=0.5[ad1];
  
  
  
  [7:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=1140000|1140000,volume=0.5[ad7];
  
  
  
  [9:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=1260000|1260000,volume=0.5[ad9];
  
  
  
  [8:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=1020000|1020000,volume=0.5[ad8];
  
  
  
  [5:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=960000|960000,volume=0.5[ad5];
  
  
  
  [6:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=480000|480000,volume=0.5[ad6];
  
  [0:1]volume=1[ad0];
  
  [ad0][ad2][ad4][ad3][ad1][ad7][ad9][ad8][ad5][ad6]amix=inputs=10:duration=first:dropout_transition=0,dynaudnorm[a0]" -map "[v0]" -map "[a0]" -c:v libx264 -ar 44100  -c:a libmp3lame -preset ultrafast -crf 17 -b:v 1M out2.flv

  partial command

  ffmpeg -i "1.mkv" -i "2.wav" -filter_complex "[0:0]setdar=4/3[v0];
  
  [1:a]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,adelay=20000|20000,volume=0.5[ad2];
  
  [0:1]volume=1[ad0];
  
  [ad0][ad2]amix=inputs=2:duration=first:dropout_transition=0,dynaudnorm[a0]" -map "[v0]" -map "[a0]" -c:v libx264 -ar 44100  -c:a libmp3lame -preset ultrafast -crf 17 -b:v 1M out2.flv

• How to overlay two audio with ffmpeg ?

  20 février 2019, par Mai Lê Nhật Huy

  Im trying mix two audio with these codes :

  for %a in ("audio\*.mp3") do ffmpeg -y -i "%a" -i "background\back.mp3" -filter_complex "[0:0]volume=1[a];[1:0]volume=0.1[b];[a][b]amix=inputs=2:duration=first" "source\%~na.mp3"

  my "back.mp3" is short and i need it repeats until the first mp3 file ends.

  How can i do that ?

• What 0a0a0a0a mean here ?

  25 juillet 2022, par sadasdsadsdadsaasd

  For a quick context :
I'm trying to run ffmpeg on aarch64 android, and have the following error :

  


  


  CANNOT LINK EXECUTABLE "/path/to/ffmpeg" :
"/path/to/libary/libc++_shared.so" has bad ELF magic : 0a0a0a0a

  


  


  But to me it seems that it has right ELF magic.

  


  First 16 bytes of libc++_shared.so

  


  


  0000000 177 E L F 002 001 001 \0 \0 \0 \0 \0 \0 \0 \0
\0 0000020

  


  


  or with readelf :

  


  


  Magic : 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00

  


  


  What am I missing in your opinion ?
What does 0a0a0a0a mean ? If I can interpret the error message I might find a solution. Thx