Recherche avancée

Sur d’autres sites (9151)

• Revision ba70f16011 : Add early termination in transform size search In the full-rd transform size se

  12 août 2014, par Yunqing Wang

  Changed Paths :
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_speed_features.c

  
   Modify /vp9/encoder/vp9_speed_features.h

  
  
  Add early termination in transform size search

  In the full-rd transform size search, we go through all transform
  sizes to choose the one with best rd score. In this patch, an
  early termination is added to stop the search once we see that the
  smaller size won’t give better rd score than the larger size. Also,
  the search starts from largest transform size, then goes down to
  smallest size.

  A speed feature tx_size_search_breakout is added, which is turned off
  at speed 0, and on for other speeds. The transform size search is
  turned on at speed 1.

  Borg test results :
  1. At speed 1,
  derf set : psnr gain : 0.618%, ssim gain : 0.377% ;
  stdhd set : psnr gain : 0.594%, ssim gain : 0.162% ;
  No noticeable speed change.
  3. At speed 2,
  derf set : psnr loss : 0.157%, ssim loss : 0.175% ;
  stdhd set : psnr loss : 0.090%, ssim loss : 0.101% ;
  speed gain : 4%.

  Change-Id : I22535cd2017b5e54f2a62bb6a38231aea4268b3f

• Revision af8d4054d6 : Revert "skip un-neccessary motion search in the first pass" This patch appears

  13 juin 2014, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_firstpass.c

  
  
  Revert "skip un-neccessary motion search in the first pass"

  This patch appears to have introduced non-determinism and/or
  mismatch from debug vs release.

  This reverts commit 5daef90efc4613efd7e7ee80ba4e1ecf9a57a966.

  Change-Id : I80081e55cfeaaa821b510b58a4e6e6328003c7da

• How to get frame number of Blackdetect result ?

  16 janvier 2023, par JustNoobish619

  I am attempting to get the frame number of a black detect result. For instance, on Blackdetect I get two results that display a start time, end time and duration, how do I get the frame number of the start time ?

  


  FPS is 59.94

  


  Here's my command I'm working with to get my blackdetect :

  


  ffmpeg –i e1.mp4 –vf “blackdetect=d=0:pix_th=0.40,” –an –f null -


  


  It results in (the start time value is the frame's timestamp (ffmpeg wiki says))

  


  [blackdetect @ 000001f4d022c900] black_start:1.06773 black_end:1.08442 black_duration:0.0166833
[blackdetect @ 000001f4d022c900] black_start:1.41808 black_end:1.43477 black_duration:0.0166833


  


  When I append -n to it to hopefully display the frame number however, it spits out 3 entries of random frame numbers that aren't even remotely close to the blackdetect frame number really is

  


  ffmpeg –i e1.mov –vf “blackdetect=d=0:pix_th=0.40” -n –an –f null - 2>showinfo.log


  


  How can I get the frame number of the start time of blackdetect ?