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• Revision 53ff43adc3 : Prunes out full-rd computation based on modeled rd Adds a speed feature to elim

  9 juillet 2013, par Deb Mukherjee

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Prunes out full-rd computation based on modeled rd

  Adds a speed feature to eliminate full-rd computation if the modeled
  rd or rd based on a different parameter in the same mode is already
  a lot larger than the best rd yet.

  Specifically, only search the sharp and smooth filters if the modeled
  rd cost based on the regular filter is within a certain factor of the
  best rd cost so far. Also, skip full-rd computation of non splitmv
  inter modes if the modeled rd cost based on pred error is within the
  same factor of the best rd cost so far.

  Also adds some enhancements in the rd search for splitmv mode to
  speed things up by early breakouts. Negligible impact on performance.

  Resuts on derfraw300 :
  psnr : -0.013% with the splitmv enhancements, -0.24% with the rd
  breakout feature on.
  speedup : 6% with splitmv enhancements, 20% with also residual breakout
  (tested on football sequence at 600 Kbps)

  Change-Id : I37abc308ea9f110c1679ce649b6a7e73ab1ad5fc

• ffmpeg speed up video - Windows

  11 avril 2016, par Flash Thunder

  In manual it says :

  ffmpeg -i input.mkv -filter:v 'setpts=0.5*PTS' output.mkv

  But when I run :

  ffmpeg -i input.mp4 -filter:v 'setpts=0.5*PTS' speedup.mp4

  I get an error :

  [AVFilterGraph @ 0000000002500600] No such filter: 'setpts=0.5*PTS'
  
  Error opening filters!

  Not sure if it means that filter can’t be opened at all or simply this filter is not available.

  How do I run it correctly ? Or maybe my release does not support it, then where can I get the release that would work right ? Win32/x64 binary

• Revision faff6ed0fb : Skip duplicate block encoding in the rd loop This speed feature allows the enco

  9 juillet 2013, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_block.h

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encodeintra.c

  
   Modify /vp9/encoder/vp9_encodemb.c

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_rdopt.h

  
  
  Skip duplicate block encoding in the rd loop

  This speed feature allows the encoder to largely remove the spatial
  dependency between blocks inside a 64x64 superblock, thereby removing
  the need to repeatedly encode superblocks per partition type in the
  rate-distortion optimization loop.

  A major challenge lies in the intra modes tested in the rate-distortion
  optimization loop. The subsequent blocks do not have access to the
  reconstructed boundary pixels without the intermediate coding steps.
  This was resolved by using the original pixels for intra prediction
  in the rd loop, followed by an appropriately designed distortion
  modeling on the quantization parameters. Experiments also suggested
  that the performance impact is more discernible at lower bit-rate/psnr
  settings. Hence a quantizer dependent threshold is applied to deactivate
  skip of block coding.

  For bus_cif at 2000 kbps,
  speed 0 : runtime 269854ms -> 237774ms (12% speed-up) at 0.05dB
  performance loss.

  speed 1 : runtime 65312ms -> 61536ms, (7% speed-up) at 0.04dB
  performance loss.

  This operation is currently turned on in settings of speed 1.

  Change-Id : Ib689741dfff8dd38365d8c1b92860a3e176f56ec