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• (FFmpeg) VP9 Vaapi encoding to a .mp4 or .webm container from given official ffmpeg example

  13 mai 2021, par User800222

  I'm trying to implement vp9 hardware acceleration encoding process. I followed ffmpeg offical github's example (Here -> vaapi_encode.c).

  



  But given example only save a .yuv file to .h264 file, I would like to save the frames to either .mp4 or .webm container. And having the ability to control the quality, and etc.

  



  I'm not reading frames from a file, I'm collecting frames from a live feed. When having full 5 secs of frames from the live feed, encode those frames using vp9_vaapi to a 5 secs .mp4 file.

  



  I'm able to save all the 5 secs frames from my live feed to a .mp4 or .webm file, but they couldn't be played correctly (more precisely : keep loading, and I open).

  



  The result from the official site's example :

  



  

  



  The cpu encoded vp9 .mp4 file result :

  



  

  



  Edit :
Result


  


• how do I echo only white space and no newline

  3 décembre 2016, par Dan Sherman

  I’m working on a simple batch script that loops over files in a directory and process them with ffmpeg. for readability purposes, I want to indent the ffmpeg output 4 spaces, but I cannot come up with a way that works.

  @echo off
  
  
  
  for %%a in (%~dp0rawVideo\*.MP4) do (
  
  
  
      if exist %~dp0rawAudio\%%~na.wav (
  
          echo Already Processed :
  
          echo     %%a
  
      ) else (
  
          echo Processing :
  
          echo     %%a
  
          echo|set /p leadingSpace="#   "   
  
          ffmpeg -c:v h264 -threads 24 -i %%a -map_channel 0.1.0 -map_channel -1 -y -v quiet -stats %~dp0rawAudio\%%~na.wav
  
      )
  
  
  
      echo(
  
  )
  
  pause

  If I just do this i get nothing, because I’ve read windows strips leading white spaces.

  echo|set /p leadingSpace="    " 

  I tried what I think is the backspace trick as well, but it didn’t work. Is there no way of doing this ?

• SDL/ffmpeg on iOS showing only blank or white screen

  3 avril 2018, par Law Gimenez

  I am following this ffmpeg/SDL tutorial using Swift and using the URL path as let urlPath = "rtsp://184.72.239.149/vod/mp4:BigBuckBunny_175k.mov" but it is only showing white or blank and it does not show anything. I want to show a window as what other tutorials say.

  I logged all the flow and there is no error. I have very little experience on SDL, let me know if some part of the code is not working.