[linux-dvb] Audio/Video Sync after remultiplexing

[Marcus O.C. Metzler <mocm@netcologne.de>]

Matthias Schniedermeyer writes:
 > #inlclude <hallo.h>
 > 
 > 
 > It seems to be normal that the "Audio"-Stream is "a bit" shorter, in a
 > given file, than the "Video"-Stream.
 > 
 > But how do i calculate the "Alignment". (How are my ASCII-Arts?)
 > 
 > e.x. 1: Audio "in the middle"
 >  ----------------------------------------------  (Audio)
 > ------------------------------------------------ (Video)
 > 
 > e.x. 2: Audio "at the beginning"
 > ----------------------------------------------   (Audio)
 > ------------------------------------------------ (Video)
 > 
 > e.x. 3: Audio "at the end"
 >   ---------------------------------------------- (Audio)
 > ------------------------------------------------ (Video)
 > 
 > When there is an offset at the beginning i have to insert "silence" to
 > adjust the alignment.
 > 
 > (I have experimented a bit with remultiplexing, and had results from
 > "perfect alignment" to "Off by about 200ms" (Mostly the audio is "to
 > late")
 > 
 > Does anyone know a tool/way to measure the "alignment" from the
 > "Source"-Stream so that i can reapply it to the remultiplexed stream.
 > 
 > 

Try the remux program in the av_pes2any package. It is not finished
yet, but it tells you the time differences between audio and video (
if the latest version is checked in the CVS). These diferences are
taken from the first sequence headers found for audio and video. I
will continue writing the remux program tomorrow, so be patient and it
will do the remuxing you are looking for (I hope). I get the offsets
from the PTS values which are off course lost after demuxing.

Marcus

---------------------------------------------------------------------
Dr. Marcus Metzler                             
mocm@netcologne.de                     http://www.metzlerbros.de
mocm@convergence.de                    http://www.convergence.de

Convergence Integrated Media GmbH          
Rosenthaler Str. 51                   
D-10178 Berlin                             
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