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• Revision 0d8723f8d5 : Make "good" quality 2-pass vpxenc encoding default Currently, the best quality

  19 août 2013, par Deb Mukherjee

  Changed Paths :
   Modify /test/encode_test_driver.cc

  
   Modify /test/error_resilience_test.cc

  
   Modify /vp9/vp9_cx_iface.c

  
   Modify /vpxenc.c

  
  
  Make "good" quality 2-pass vpxenc encoding default

  Currently, the best quality mode in VP9 is not very well developed,
  and unnecessarily makes the encode too slow. Hence the command line
  default is changed to "good" quality. Also, the number of passes
  default is changed to 2 passes as well, since 1-pass encoding is
  not very efficient in VP9.

  Besides, a number of VP9 defaults are set to the currently
  recommended settings. With these changes, vpxenc
  run with —codec=vp9 —kf-max-dist=9999 —cpu-used=0 should
  work about the same as our borg results.
  Note when the —cpu-used=0 option is dropped there will be a slight
  difference in the output, because of a difference in the cpu-used
  value for the first pass. Specifically, the default when unspecified
  is to use cpu_used=1 for the first pass and cpu_used=0 for the
  second pass. But when specified, both passes will use the cpu-used
  value specified.

  Note that this also changes the default for VP8 as being "good"
  but other options stay unchanged.

  Change-Id : Ib23c1a05ae2f36ee076c0e34403efbda518c5066

• avdevice/sdl2 : add option to set window position

  1er octobre 2018, par Dave Rice

  avdevice/sdl2 : add option to set window position
  Allows arrangement of multiple windows such as :
  
  ffmpeg -re -f lavfi -i mandelbrot -f sdl -window_x 1 -window_y 1 mandelbrot -vf waveform,format=yuv420p -f sdl -window_x 641 -window_y 1 waveform -vf vectorscope,format=yuv420p -f sdl -window_x 1 -window_y 481 vectorscop
  Some changes by Marton Balint :
  
   allow negative position (partially or fully out-of-screen positions seem to
  
    be sanitized automatically by SDL (or my WM ?), so no special handling is
  
    needed)
  
   only show window after the position is set
  
   do not use resizable and borderless flags at the same time, that caused
  
    issues in ffplay
  
   add docs
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] doc/outdevs.texi
  • [DH] libavdevice/sdl2.c
  • [DH] libavdevice/version.h

• Is it good to use minterpolate in FFmpeg for reducing blurred frames

  30 mars 2022, par Udi

  I'm using FFMPEG to slice png files from videos.

  


  I'm slicing the videos in fps between 1-3 depending on some video metadata.
I can see that when the subjects in the video moving fast or the camera are not steady I will get blurred frames. I try to research how I can solve it (The quality of these frames is my main goal) and I tackled the minterpolate option.

  


  I think that if I will use the blend option that will mean the 3 frames to 1 the "noise" of the blurred subjects will reduce.

  


  So my current command now is like this :

  


  ./ffmpeg -i "/home/dev/ffmpeg/test/input/@3.mp4" -vf minterpolate=fps=1:mi_mode=blend,mpdecimate=hi=11456:lo=6720:frac=0.5 -vsync 0  "/home/dev/ffmpeg/test/output/3/(#%04d).png"


  


  Am I right ? Do you think of a better way to use FFMPEG to solve my problem ?