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• Revision aa5b67add0 : Changes to adaptive inter rd thresholds. Values now carried over frame to frame

  23 août 2013, par Paul Wilkins

  Changed Paths :
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Changes to adaptive inter rd thresholds.

  Values now carried over frame to frame.
  Change to algorithm for decreasing threshold after
  a hit and to max threshold (now based on speed)

  Removed some old commented out code relating to
  VP8 adaptive thresholds.

  The impact of these changes tested on Akiyo (50 frames)
  and measured in terms of unit rd hits is as follows :

  Speed 0 84.36 -> 84.67
  Speed 1 29.48 -> 22.22
  Speed 2 11.76 -> 8.21
  Speed 3 12.32 -> 7.21

  Encode speed impact is broadly in line with these.

  Change-Id : I5b886efee3077a11553fa950d796fd6d00c8cb19

• Revision 4a101310e8 : Adapt mode based rd_threshold for similar block size The rd_thresholds are adap

  23 septembre 2014, par Yaowu Xu

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

  
   Modify /vp9/encoder/vp9_speed_features.c

  
  
  Adapt mode based rd_threshold for similar block size

  The rd_thresholds are adaptively changed based on best mode tested.
  It was only changed for the same block size, this commit makes the
  adaptation for similar block sizes too. The commit also made minor
  adjustment and code cleanups.

  The impact on encoding time for _ped :
  118089 ms -> 111927 ms

  The impact on compression :
  derf : -0.339%
  stdhd : -0.303%

  Change-Id : I8817fed1102350497f2ec631849e43f753878e5d

• FFMPEG reports different (wrong) video resolution compared to how it actually plays

  30 mars 2015, par Emiliano

  Quick question, i have a movie, which was cut and rendered with Sony Vegas from its original format to a .wmv file. Here comes the tricky part, movie when played, either with VLC or WMP, has a resolution of 656x480 ... BUT when i run a ffmpeg -i on it, it says it has a resolution of 600x480 ....

  I took the time of actually capturing a frame and croping it with photoshop and its 656 and not 600 like ffmpeg its reporting, why would this could be happening ? How could i fix the headers resolution ? Would that have any impact on video re-rendering ? As i said, VLC and WMP seems not to care about the incorrect headers and are playing it right, BUT, jwplayer seems to be using the header information, which i don’t blame him, its correct to do that, but why the video headers could be wrong ?

  ffmpeg -i trailer.wmv

  Input #0, asf, from ’trailer.wmv’ :
  Duration : 00:01:04.93, start : 3.000000, bitrate : 2144 kb/s
  Stream #0.0 : Audio : wmav2, 44100 Hz, mono, 32 kb/s
  Stream #0.1 : Video : wmv3, yuv420p, 600x480 [PAR 59:54 DAR 295:216], 2065 kb/
  s, 25.00 tb(r)

  And yeah, the PAR/DAR parameters are also wrong, but honestly, i don’t understand that technical shit, usually watch video and make sure it look good, any feedback would be appreciated :P

  Is there a way to change the container information with ffmpeg so applications that actually do use the container information don’t render video incorrectly ?