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• 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

• Adding text to movie using ffmpeg

  23 août 2014, par microspace

  I use git to track *.ass subtitle files.
  Here is example of *.ass file :

  [Script Info]
  
  ; Script generated by Aegisub 3.1.2
  
  ; http://www.aegisub.org/
  
  Title: Default Aegisub file
  
  ScriptType: v4.00+
  
  
  
  [V4+ Styles]
  
  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour,    BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
  
  Style: Default,Arial,20,&H00FFFFFF,&H000000FF,&H00000000,&H00000000,0,0,0,0,100,100,0,0,1,2,2,2,10,10,10,1
  
  Style: titr,DejaVu     
  
  
  
  Sans,20,&H007DDBFA,&H000000FF,&H00000000,&HFF000000,0,0,0,0,100,100,0,0,1,2,2,1,10,10,10,1
  
  
  
  [Events]
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
  
  Dialogue: 0,0:00:00.46,0:00:11.22,Default,,0,0,0,,Если это можно было бы
  
  Dialogue: 0,0:00:03.44,0:00:08.96,titr,,0,0,0,,{\pos(20,240)\fad(600,600)}бывший министр

  After commit I burn subtitles into video :

  ffmpeg -i video.avi -vf "ass=subtitle.ass" out.avi

  My goal is to show commit date for 10 second at the start of movie. This should be done automatically.

  1) It can be easily done with by modifying subtitle.ass itself, but I can’t do it after commit and there are other reasons.

  2) It can be done by ffmpeg from command line : How to use ffmpeg to add a text to avi video ?

  Problem is that in this case text will be shown for the whole lenght of movie.

  3) I can copy *.ass file to temporary directory, insert date, render and delete *.ass file.

  Is there a simpler way ?

• gifs not loops in ffmpeg movie filter

  28 août 2014, par user2925649

  I have a gif that loops infinite(loop.gif). I want to overlay this gif to top left corner of video.mpg. So I am using this code to make this :

  ffmpeg -i video.mpg -vf "movie=loop.gif [logo]; [in][logo] overlay=10:10 [out]" -vcodec mpeg2video out.mpg

  The problem is ; gif loops only 1 time and last frame of the gif showing until end of video.mpg.

  How can I loop this gif continuously ?