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• lavc/libopenh264enc : add bit rate control select support

  29 avril 2020, par Linjie Fu

  lavc/libopenh264enc : add bit rate control select support
  RC_BITRATE_MODE :
  
      set BITS_EXCEEDED to iCurrentBitsLevel and allows QP adjust
  
      in RcCalculatePictureQp().
  RC_BUFFERBASED_MODE :
  
      use buffer status to adjust the video quality.
  RC_TIMESTAMP_MODE :
  
      bit rate control based on timestamp, introduced in release 1.4.
  Default to use RC_QUALITY_MODE.
  Signed-off-by : Linjie Fu <linjie.fu@intel.com>
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/libopenh264enc.c

• What determine number of cpu core usage of filter select=gt(scene,0.1) ?

  15 décembre 2022, par kocoten1992

  I've notice that when using filter gt(scene,0.1), for example :

  


  ffmpeg -i big_buck_bunny.mkv -filter:v "select='gt(scene,0.1)',showinfo" -f null -

  


  Depends on the video, number of cpu cores usage varies extremely (sometimes it 3 cores usage - other time 12 cores usage in different video).

  


  Would like to ask what determine that logic ?

  


  I try to read ffmpeg source code but not familiar with it, a general explanation would be enough, but much appreciate if you point out the line/directory determine that logic in https://github.com/FFmpeg/FFmpeg.

  


  (Also not asking how to reduce cpu usage, interested in the logic determine that).

  


• How to execute this ffmpeg command for multiple videos in a folder and rename them on Linux terminal [duplicate]

  3 février 2023, par average_grad_student

  I'm trying to change the framerate of my video to 15fps and I need to do that for 100+ videos that are in the same folder

  


  For processing a single video I use the following command-
ffmpeg -i input.mp4 -filter:v fps=fps=15 processed/input_15fpst.mp4

  


  How do I do this for multiple videos in the folder and add a suffix _15fps to them ? I'm not very familiar with Linux programming

  


  Thank you so much !

  


  I tried doing this-
  
for f in *.MP4; do ffmpeg -i "$f" -filter:v fps=fps=15 process/"$f"; done

  


  But I want to rename the file as well, how do I change my loop ?