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• Converting avi to mp4 : audio is out of sync

  17 octobre 2011, par M.S

  I'm using ffmpeg to convert a video from avi to mp4.
  The audio / video in the output mp4 are out of sync. I researched and found the following link, which suggests that this is an issue with newer builds of ffmpeg :

  http://forum.videohelp.com/threads/320342-Audio-out-of-sync-problem-with-FFMPEG-encoding-MP4-%28h-264-AAC%29?p=1983858&viewfull=1#post1983858

  I tried build 18715 as suggested and indeed the a/v is in sync. I thought I'd just use this build, but I then realized that the output file size is much larger (about a third more). Any idea why ? Bandwidth is currently a major concern in my application.

  I'm trying to either solve the sync problem with the latest build or figure out how to reduce the size of the file with the older build. Any suggestions ?

  EDIT :
  The command I use for the conversion :

  ffmpeg -i test.avi -vb 100k -ab 48k -r 20 test.mp4

  This is a very low res and quite static video and the low bitrate is adequate (and isn't a cause for any problem when not using mp4).

• Could I use openframeworks and upd play the video in other computer ?

  7 novembre 2014, par cindywmiao

  I want to use openframework, udp connection and FFMPEG encode and decode to play the video from the other computer.

  I could not find how to turn the byte[] into one frame with FFMPEG decode. Is there some example/demo ?
  I found two demos from Internet. http://forum.openframeworks.cc/t/export-audio-and-or-video-using-ffmpeg/5123 This one is only the example for mac, but I use visual studio.

  Then, http://www.morethantechnical.com/2013/04/11/simplified-ffmpeg-video-writer-also-for-openframework-w-code/, this one does not work. It shows my the error :

  The program can't start because avcodec-56.dll is missing from your computer. 
  
  Try reinstalling the program to fix this problem.

  Could someone give me a clue how to do it ?

• Anomalie #3526 : 3.1, #URL_FORUM inconsistant

  14 août 2015, par b b

  Quel type d’urls tu utilises ? Pour info, forum.spip.net est en 3.1 alpha et je n’y observe pas le bug (peut-être parce qu’il utilise des urls persos).