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• Enable QSV for FFmpeg with directshow input and JPEG image sequence output

  10 mars 2020, par clic

  I’m using FFmpeg with Directshow input. The output is a series of single JPEG images. FFmpeg itself maps the stream to mjpeg and uses image2 for the output.

  Is it possible to increase performance by using the Intel QuickSync Video (QSV) hardware acceleration for this process ? The FFmpeg QuickSync Wiki actually lists JPEG encoding since Braswell.

  This is what I tried so far :

  ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -f dshow -video_size 3840x2160 -framerate 25 -i "video=My Webcam" -vf hwupload=extra_hw_frames=64,format=qsv -vcodec mjpeg_qsv "C:\out\%d.jpg"

  The command works, images are generated - but the GPU load seems to be the same as without any qsv options..?

  Thanks !

• FFMpeg how to add advance filters to Video

  25 décembre 2016, par sector11

  How to add advance filters like Snow rain to video using ffmpeg library.
  I have visited : https://ffmpeg.org/ffmpeg-all.html and https://trac.ffmpeg.org/wiki/FilteringGuide but cannot come to any conclusion reading these references.

• yasm is installed in my system but in some other folder

  22 octobre 2014, par janpal

  I am trying to install ffmpeg and x264. For this to install I have followed the instructions given in "https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide". I have installed yasm and checked by using the command yasm —version it showing the successfully installed version. But when I try to install ffmpeg its throwing an error like yasm not found. I have referred some sites its intend me to check the path. yasm default path is /usr/local/bin but in my system its showing as /home/janpal/bin/yasm. I tried it as a root user also. Can somebody help me to install this in the correct path. I am using ubuntu 10.04