[MEncoder-users] Any recent changes that could affect MPEG 2 muxing?

[L. Lee]

On 3/25/11 1:26 AM, "Laine Lee" <llee040 at sbcglobal.net> wrote:

> On 3/23/11 3:29 PM, "Reimar Döffinger" <Reimar.Doeffinger at gmx.de> wrote:
> 
>> On Wed, Mar 23, 2011 at 12:58:24AM -0500, L. Lee wrote:
>>> If I execute a mux command to adjust A/V sync in an MPEG 2 stream such as
>>> mencoder [inputfile.mpg] -ovc copy -oac copy -ofps 24000/1001 -of mpeg
>>> -mpegopts format=dvd:tsaf:adelay=-200:muxrate=40000 -o [outputfile.mpg]
>>> using MEncoder svn r32924 (as well as quite a few previous versions),
>>> everything works well.
>>> 
>>> If, however, I execute that command using r33094, the audio tempo appears to
>>> be increased greatly, demolishing sync, and the command progress output
>>> includes many duplicate frame notifications. The visual output remains
>>> unaffected.
>>> 
>>> Has something changed that can be accommodated by adjusting any of the above
>>> command options? The source video is 24 fps with 6-channel audio (AC3).
>>> Thanks.
>> 
>> Mencoder A/V sync code was changed, though I think it should not affect
>> the copy case.
>> However I think you should always use -mc 0 -noskip if you copy both
>> audio and video, and using -ofps probably is a bad idea as well.
> 
> 
> Thanks, I tried all of your suggestions, but the problem remains, with
> today's SVN as well as with r33094. But, since giving the entire matter some
> more thought, I am not at all sure that I have used the mpeg 2 mux function
> since building mplayer/mencoder on my system began requiring an internal git
> instance of ffmpeg.
> 
> I can get the latest version of ffmpeg using svn checkout, but when I point
> the mplayer build configuration toward it, I get this message:
> 
> "You have an outdated FFmpeg SVN checkout in ffmpeg/, please (re)move or
> replace it"
> 
> So I wonder if that might be related to my problem. Can you recommend a
> build option that would allow me to specify existing ffmpeg source rather
> than the one furnished using the mplayer/mencoder git method (which is at
> least somewhat different)?

I got it. I'm using Mac OS X 10.6.7. I compiled r33113 using "./configure
--cc=gcc-4.2 --disable-live" (Thanks, Carl Eugen Hoyos!) and I added
"-demuxer lavf" to the command line suggested by Reimar Döffinger. Thanks.

Laine Lee