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

[Anthony Castillon]

Thanks for the reply, Dominik.
 
I actually stumbled into mencoder while looking for a solution to concatenate multiple wmv files into a single wmv file. 
 
I simplified my command to remove the -lavcopts argument:
mencoder -ovc copy -oac copy -o <output file path> <list of files to merge>
 
However, I'm still not getting any audio in the merged output.
 
I read about ffmpeg too.  However, I read somewhere that you have to encode the input files to mpg and concatenate them, then reencode the concatenated file to wmv.  Is this true?  
 
Anthony
 


----- Original Message ----
From: Dominik 'Rathann' Mierzejewski <dominik at rangers.eu.org>
To: MPlayer-users at mplayerhq.hu
Sent: Thursday, October 9, 2008 1:58:12 PM
Subject: Re: [MPlayer-users] Stitched video file has no audio and no timecode

On Thursday, 09 October 2008 at 17:18, Anthony Castillon wrote:
> I'm using mencoder to stitch together multiple .wmv files and output
> to a single .wmv file.  I'm pretty much successful in doing so using
> the following command
> 
> mencoder -ovc copy -oac copy -lavcopts vcodec=msmpeg4v2 -of lavf -o <output file path>  <list of files to merge>

-lavcopts has no effect if you're using -ovc copy.

> I have two problems, however, with the stitched file:
> 1.  It does not have any audio even though the individual files have sound
> 2.  It does not show the timecode even though each input file has timecode
> (i.e. when I play the individual files in WMP 10, I can see the running
> timecode; this does not happen with the merged 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 (but timecode was still missing).  However, when I asked our broadcast
> group to send me sample .wmv files to test stitching with, the merged file
> did not have audio.
> 
> Does that mean they have an audio codec which I do not have?

No. Audio codecs are irrelevant if you're using -oac copy, as long
as MEncoder supports muxing that codec.

> If so, how come I can play the individual .wmv files in my machine without
> audio problems but I'm having the problem with the merged file.
> 
> How can I get the timecode from the individual files to be picked up in the
> merged file?
> 
> I'd really appreciate any inputs.

Well, MEncoder supports AVI and MPEG output best. Anything else works by pure
luck. Thus, I suggest using FFmpeg if you don't need to use any of MEncoder's
filters.

Regards,
R.

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