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• ffmpeg : Make output file duration that of the file with the longest length [closed]

  27 février 2024, par losercantcode

  I'm going crazy trying to figure this out.

  


  Essentially I'm trying to apply sidechain compression using ffmpeg (for the sake of speed and automation). a2.mp3 in this example is the full length track and a1.wav is a short 5 second, spoken-word clip. The code currently applies the sidechain compression well, but the output file is only that of the spoken-word clips length, so 5 seconds. Is it at all possible to make the output match that of a2.mp3's length instead ? Switching around the input order is not something that's possible as it'll apply the compression to the incorrect track.

  


  Essentially, i'm trying to make it so i'm just layering the spoken-word file on top of the audio track without having to pre-pad the file. I'd rather, if it's possible, this just happen with one block of code within the in one program. I'm interested to see if this is at all possible within ffmpeg.

  


  ffmpeg -i a2.mp3 -i a1.wav -filter_complex "[1:a]asplit=2[sc][mix];[0:a][sc]sidechaincompress=threshold=0.000976563:ratio=10:level_sc=0.015625:release=100:attack=10[compr];[compr][mix]amix=duration=longest[aout]" -map "[aout]" output.wav


  


  a1.wav is mon, a2.mp3 is stereo.

  


  Attempted to implement amix=duration=longest to no avail. Research similar problems on the Stack Exchange that gave unrelated answers.

  


• FFmpeg seems to be version conflict

  4 novembre 2014, par user3177342

  I am using git version of ffmpeg( renewed after old version succesful using) , when i try to compile my project i get

   /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:376: undefined reference to `swr_is_initialized'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:222: undefined reference to `swr_is_initialized'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_init_resample':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:163: undefined reference to `swr_init'
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:169: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_frame':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:236: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_flush_resample':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:117: undefined reference to `swr_convert'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_subpacket':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:408: undefined reference to `swr_close'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_flush':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:557: undefined reference to `swr_close'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_close':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:579: undefined reference to `swr_free'
  
  /usr/local/lib/libavcodec.a(opusdec.o): In function `opus_decode_init':
  
  /home/user/projects/ffmpleglast/ffmpeg/libavcodec/opusdec.c:629: undefined reference to `swr_alloc'

  Seems to be version conflict ? but how to delete wrong libs ? they seem to be todays build.

  ls -l /usr/local/lib
  
  -rw-r--r-- 1 root root  136509684 may   29 14:47 libavcodec.a
  
  -rw-r--r-- 1 root root    1853574 may   29 14:47 libavdevice.a
  
  -rw-r--r-- 1 root root    9689456 may   29 14:47 libavfilter.a
  
  -rw-r--r-- 1 root root   46282270 may   29 14:47 libavformat.a
  
  -rw-r--r-- 1 root root    2092250 may   29 14:47 libavutil.a
  
  -rw-r--r-- 1 root root      67942 may   12 11:29 libBasicUsageEnvironment.a
  
  -rw-r--r-- 1 root root    2200164 apr.  10 10:11 libfftw3.a
  
  -rwxr-xr-x 1 root root        872 apr.  10 10:11 libfftw3.la
  
  -rw-r--r-- 1 root root      94188 may   12 11:29 libgroupsock.a
  
  -rw-r--r-- 1 root root    2236084 may   12 11:29 libliveMedia.a
  
  -rw-r--r-- 1 root root     546506 may   29 14:47 libswresample.a
  
  -rw-r--r-- 1 root root    4813716 may   29 14:47 libswscale.a
  
  -rw-r--r-- 1 root root      14588 may   12 11:29 libUsageEnvironment.a

• Set minimal ts duration in ffmpeg command

  22 août 2017, par Ales

  We are using ffmpeg to convert mp4 video file to hls.
  When video is converted, it sometimes happens that last ts chunk is about 0.03s. And player stalls on this chunk for a while. Is there a special command in ffmpeg to set minimal ts duration ? Or other way to avoid such ts chunks ?
  In our command to set up ts duration we use : -segment_time  5