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• How can I automatically embed commit information into a subtitles file that I'm tracking ?

  23 février 2015, 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 ?

• flacdsp_lpc_template : add comment to explain the CONFIG_SMALL code

  14 février 2014, par James Darnley

  flacdsp_lpc_template : add comment to explain the CONFIG_SMALL code
  I found the optimisation of 2 samples per iteration obscured the
  
  underlying algorithm.  I had to write it out on paper and translate into
  
  a mathematical sum to see that the two samples are unconnected.  I hope
  
  that if anyone else is struggling to understand the code that this will
  
  be useful.
  Reviewed-by : Christophe Gisquet <christophe.gisquet@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/flacdsp_lpc_template.c

• tests/swscale : switch from MSE to SSIM

  25 février, par Niklas Haas

  tests/swscale : switch from MSE to SSIM
  And bias it towards Y. This is much better at ignoring errors due to differing
  
  dither patterns, and rewards algorithms that lower luma noise at the cost of
  
  higher chroma noise.
  The (0.8, 0.1, 0.1) weights for YCbCr are taken from the paper :
  
    "Understanding SSIM" by Jim Nilsson and Tomas Akenine-Möller
  
    (https://arxiv.org/abs/2006.13846)
  

  • [DH] libswscale/tests/swscale.c