[MPlayer-users] Stitched video file has no audio and no timecode

[Anthony Castillon]

I'm assuming the files created by our broadcast team were created using the same audio codec; I'm trying to get additional information from them though.

What would be the reason why the audio in the individual files play properly in WMP 10 but not the audio in the merged file?  I'm just thinking this might be due to differences in audio codec among the input files?  Are there other reasons?

I have very basic knowledge of codec stuff since I'm just picking up the knowledge now for the project I'm doing at work.  I just want to have a better grasp of what I need to do.

Thanks.
Anthony

----- Original Message ----
From: Oliver Seitz <info at vtnd.de>
To: "MPlayer usage questions, feature requests, bug reports" <mplayer-users at mplayerhq.hu>
Sent: Thursday, October 9, 2008 2:06:48 PM
Subject: Re: [MPlayer-users] Stitched video file has no audio and no timecode

> mencoder -ovc copy -oac copy -lavcopts vcodec=msmpeg4v2 -of lavf  
> -o <output file path>  <list of files to merge>

Err... You say -ovc, that is, don't change the video codec, and specify
-lavcopts vcodec=msmpeg4v2, that is change video codec to msmpeg.
Hard job to do, ins't it, changing the codec without changing it.

> 1.  It does not have any audio even though the individual files have  
> sound

Have you tried two files that use the same audio codec? I could imagine
that sound might be hard to play when it starts as stereo mp3 and changes
to ac3-surround midway in the file.

> For the first problem, I previously tested it with .wmv files that I  
> encoded in our encoding workstation and the merged file had no problem  
> with the audio.

Presumably they all had the same audio codec.

when using -ovc copy -oac copy to concatenate files, make sure they have  
identical
codecs in the first place. Or re-encode them.

Greets,

Kiste
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