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• The FFmpeg-generated video mute after seeking it forward [closed]

  16 septembre 2022, par PersianMan

  The video mutes after seeking it forward. It was created with FFmpeg. When I play it normally (without seeking it), the audio played. I am a Linux user and test it with VLC media player and mpv.

  


  I generated it with this :

  


  ffmpeg  -i video.flv -i audio1.flv -i audio2.flv -i audio3.flv -i audio4.flv -i audio5.flv  -i audio6.flv  -i audio7.flv  -i audio8.flv  \
-filter_complex "\
[0:v]tpad=start_duration=29.429[v];\
[1:a]adelay=3654.0[a1];\
[2:a]adelay=53563.0[a2];\
[3:a]adelay=1148851.0[a3];\
[4:a]adelay=1313774.0[a4];\
[5:a]adelay=1373197.0[a5];\
[6:a]adelay=2061735.0[a6];\
[7:a]adelay=2736617.0[a7];\
[8:a]adelay=3387278.0[a8];\
[a1][a2][a3][a4][a5][a6][a7][a8]amix=inputs=8[a]"\
 -map "[v]"  -map "[a]"  -c:v libx264 -crf 23 -c:a mp3 -s 500x500 -shortest ./output.flv


  


  [1:a] and [5:a] is a main audio (other audio have small duration). If I seek after 1373197.0 ms, the video has been muted (when [5:a] must be played).

  


• How to batch generate EDL (edit decision list) files for a folder of videos with different run times

  22 janvier, par DnK

  How to batch generate EDL (edit decision list) files for a folder of videos with different run times ? I need to skip exact amount of seconds from the start and another amount of seconds from the end. All the videos have different runtimes I can make EDL files for skipping the intro but need a way to read the video runtime and skip the last 60 or 90 seconds.

  


  This is the format for the EDL I am using with kodi

  


  0:00:00   0:01:20.    3


  


  So if the video is 40 mins 30 seconds the EDL generated skipping 80 seconds from the start and 90 seconds from the end should be

  


  0:00:00   0:01:20.    3
0:39:00   0:40:30.    3


  


  More info about kodi EDL

  


  https://kodi.wiki/view/Edit_decision_list

  


• Is ffmpeg running in CPU or GPU ?

  14 juillet 2016, par Raghul Selvaraj

  It has been shown in the link

  https://dri.freedesktop.org/wiki/IntelPerformanceTuning/

  Step 2 : CPU vs GPU

  that if the CPU % is more than 90 then the app is running in CPU.

  While configuring ffmpeg, I enabled opencl. ffmpeg configurations are,

  ffmpeg version ebe0fa0 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
    configuration: --enable-gpl --enable-libx264 --enable-opencl --enable-nonfree --enable-libmfx --enable-libmp3lame --enable-libaacplus
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  But while running ffmpeg using the command

  ffmpeg -i /home/M.mp4 -c:v h264 -preset:v faster /home/out.avi

  the CPU% has been more than 90 (375%).

  In case of ImageMagick, if I enable opencl while configuring, then the app will run in GPU, i.e., the CPU% will be less than 90. I noticed that.

  But in case of ffmpeg, it is GPU accelerated one. Then, Why the CPU% is more than 90% ? Is the ffmpeg running in CPU or GPU ? If it is not, how can I make it to run in GPU ?