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• FFMPEG : Encoding MKV to Prores, resulting in asynchronous audio

  23 juin 2015, par Simon

  I don’t know if it’s the "best" way to do it, but for being able to use Bluray material in Avid, I’m converting M2TS files to Prores quicktimes.

  I’m using Another GUI with following parameters :

  -i "<fullsourcefilename>" -y
  
  
  
  -map 0:v
  
  -map 0:a:4
  
  
  
  -vcodec prores -profile:v 3
  
  -acodec pcm_s16le -ac 2
  
  
  
  "<outputpath><outputfilename>_prores.mov"
  
  </outputfilename></outputpath></fullsourcefilename>

  This works for M2TS files, but when doing the same for MKV ones, I still get the video and audio, but the audio is not synced with the picture anymore.

  Is this a known issue, or how to fix it ?
  I would need the most efficient/fastest way (so not too complicated, because it should be clear to users what to do).
  Thank you !

• Revision 0393e558a4 : Fix stack overrun in calculating segmentation map coding method. This caused sp

  16 août 2012, par Ronald S. Bultje

  Changed Paths : Modify /vp8/encoder/segmentation.c Fix stack overrun in calculating segmentation map coding method. This caused spurious crashes on encodes, frustratingly often only on high-definition material. Change-Id : Ia8c1dfc420d598ca92108bd9cc2df7450e8d10a2

• 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 ?