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• 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 ?

• Reliability of using FFMPEG in IOS application ?

  20 juin 2014, par 2vision2

  What i am trying to do :

  Trying to develop an Enterprise level IOS application with FFMPEG for video Processing.

  What i have done so far :

  Created a Linux based sample program with FFMPEG and made it work. Learnt how to use FFMPEG. I have already found the build instructions to build the FFMPEG packages
  for IOS.

  What help i need :

  Does apple allow to place the FFMPEG based application in IOS Application Store ?

  As there is no official support from ffmpeg community for IOS, how reliable the "FFMPEG-IOS" is, as i don’t want to get into any problems in future especially when apple releases a new version of os or the problem of ffmpeg only with IOS ?

• avcodec/svq1 : fix interframe mean VLC symbols

  31 octobre 2022, par Peter Ross

  avcodec/svq1 : fix interframe mean VLC symbols
  Fixes ticket #128.
  The SVQ1 interframe mean VLC symbols -128 and 128 are incorrectly swapped
  
  in our SVQ1 implementation, resulting in visible artifacts for some videos.
  
  This patch unswaps the order of these two symbols.
  The most noticable example of the artiacts caused by this error can be observed in
  
  https://trac.ffmpeg.org/attachment/ticket/128/svq1_set.7z '352_288_k_50.mov'.
  
  The artifacts are not observed when using the reference decoder
  
  (QuickTime 7.7.9 x86 binary).
  As a result of this patch, the reference data for the fate-svq1 test
  
  ($SAMPLES/svq1/marymary-shackles.mov) must be modified. For this file, our
  
  decoder output is now bitwise identical to the reference decoder. I have
  
  tested patch with various other samples and they are all now bitwise identical.
  

  • [DH] libavcodec/svq1_vlc.h
  • [DH] tests/ref/fate/svq1