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• Make an Alpha Mask video from PNG files

  15 juin 2019, par Archimedes Trajano

  For RenPy it uses the notion of an Alpha Mask video https://www.renpy.org/doc/html/movie.html#movie-displayables-and-movie-sprites

  I can convert the a bunch of PNGs with alpha channel to http://wiki.webmproject.org/howtos/convert-png-frames-to-webm-video I was wondering how to do the same sort of thing without creating another set of PNG files with just the alpha frame.

  I’ll be okay with something that uses imagemagik in the middle if needed.

• what is the best way to append a video file to multiple video files using batch file [on hold]

  5 avril 2017, par JAGGADAKU

  i am beginner with computer programming and i have knowledge of c/c++

  from [https://trac.ffmpeg.org/wiki/Concatenate][1] i have learned that how to merge video files using ffmpeg

  To list all video files containing in a folder

  (for %%i in (*.mp4) do @echo %%i) > mylist.txt

  to concatenate files

  ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

  This merges all files of a list to one single file.
  but How do i append one video file(main.mp4) at the starting of all the video files listed in mylist.txt ?

  can someone help me ?

  Hello there

  i have tried following code i don’t know what’s wrong with it but it is not `

  @echo off
  
  (for %%i in (*.mp4) do @echo %%i) > mylist.txt
  
  
  
  for /F "tokens=*" %%A in (mylist.txt) do (
  
      echo %%A
  
      ffmpeg -i "concat:main.mp4|%%A" -c copy  %%Aoutput.mp4
  
  
  
  )
  
  `

• Is ffmpeg running in CPU or GPU ?

  25 mai 2021, 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 ?