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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 !

• Merge commit ’04763c6f87690b31cfcd0d324cf36a451531dcd0’

  18 mars 2017, par Clément Bœsch

  Merge commit ’04763c6f87690b31cfcd0d324cf36a451531dcd0’
  * commit ’04763c6f87690b31cfcd0d324cf36a451531dcd0’ :
  
    h264_direct : use the reference mask from the actual reference
  This commit is a noop, see d8151a7e944aea52d167571badc247c8d9972847
  Merged-by : Clément Bœsch <u@pkh.me>
  

• ffmpeg - prop flicker removal works but ffmpeg insists on changing framerate [closed]

  28 avril 2023, par Mutley Eugenius

  I have been researching how to use FFmpeg to do some fantastic wizardry on my cockpit videos to remove the dramatically distracting propeller, but after many hours now I cannot seem to find a way to get the program to stop stripping more than half the frames. The source video file is 1920 x 1080 @ 60fps and I believe I have my offset right (1/60= 0.0166) but the output video is always coming out at 25 fps. Can't see what element in the code is telling it to do that, or how to change it.

  


  Here's my file :

  


  https://drive.google.com/file/d/1VPttH4PHgUr0uzmsbl4Bcyg5_gAixblA/view?usp=sharing

  


  Here's my code :

  


  ffmpeg -i G:\PropFlicker.mp4 -itsoffset 0.01666 -i G:\PropFlicker.mp4 -filter_complex color=0x202020:s=1920x1080:d=24[mask];[mask][0][1]maskedmax=[out] -map [out] -crf 10 G:\PropNoFlicker.mp4


  


  I have tried adding -r 60 which gives me a 60 fps output file, but the video is still being processed at 25 and it just adds in duplicated frames after processing to pad it out to 60. The rendering shows more dropped frames than rendered frames by about a 3 to 2 ratio which matches frame drops from 60 to 25. I lose my shot fluidity and I get flickery artifacts

  


  What am I missing to get the flicker removal processing done at 60 fps and the output file rendered at 60 fps with the original smoothness ?

  


  I'm also not sure what the :d=24 is doing. I tried d=60, but it made no difference.

  


  I copied original code that I found in this link :

  


  text