[MPlayer-users] Recoding to VCD Using MEncoder Only

[Carlos Mazieri]

Em Seg 10 Mai 2004 13:28, Nico Sabbi escreveu:
> Gordan Bobic wrote:
> >On Monday 10 May 2004 17:03, Nico Sabbi wrote:
> >>>>>Is there any reason why this cannot be done? I presume that it
> >>>>>cannot be done, since I have found the mencvcd script in the TOOLS
> >>>>>directory which seems to use an exceedingly long winded way of
> >>>>>recoding files into VCD format, using mjpegtools.
> >>>>>
> >>>>>I think I have managed to get the mencoder setup almost right to
> >>>>>achieve the same thing without the clutter of all the other
> >>>>>seemingly inferior tools and overheads of doing the same job
> >>>>>several times, but I am stuck in one last tiny detail.
> >>>>>
> >>>>>Here is the script I use:
> >>>>>
> >>>>>#!/bin/bash
> >>>>>mencoder	-oac lavc	\
> >>>>>		-ovc lavc	\
> >>>>>		-ofps 25	\
> >>>>>		-of mpeg	\
> >>>>>		-lavcopts
> >>>>>vcodec=mpeg1video:acodec=mp2:vbitrate=1150:abitrate=224:vrc_buf_si
> >>>>>ze =327:vrc_maxrate=1150
> >>>>
> >>>>you missed keyint=12, but generally dvd players tolerate much
> >>>>longer values;
> >>>
> >>>Ah, OK. Is 12 really what the spec for VCD says? That sounds rather
> >>>small...
> >>
> >>yes it's tiny, and if I remember correctly it's the value stated in
> >>the specs, but following the standard at the letter with modern
> >>players is quite useless.
> >>In my opinion you can safely use a larger value.
> >
> >OK, thanks. I'll up that to around 125, and see if it works on a few DVD
> >players...
> >
> >>>>2 passes and mbd=2 are reccomended
> >>>
> >>>OK, I'll try it with mbd=2 and see if it looks better...
> >>>
> >>>>>\
> >>>>>		-vf scale=352:288,dsize=4/3	\
> >>>>>		-af resample=44100:0:2	\
> >>>>>		$1 -o $2
> >>>>>
> >>>>>This seems to work really well, except for one small problem - the
> >>>>>"-af resample=44100:0:2" part doesn't seem to do what the
> >>>>>documentation says it should (or maybe I am reading it wrong).
> >>>>
> >>>>-srate 44100 usually works well
> >>>
> >>>Ah, excellent, thanks, that did the trick. :-)
> >>>
> >>>>>I have videos encoded with varying frequencies other than 44100
> >>>>>(e.g. 22050, 48000), and I have to make this into 44100 to make it
> >>>>>VCD compliant. However, the files encoded using the above script
> >>>>>still have the same audio frequency (confirmed using "mplayer
> >>>>>-identify") as the source file. The video seems to be in the
> >>>>>correct format, but the audio is not.
> >>>>>
> >>>>>What I am I doing wrong? I would really like to avoid using the
> >>>>>mjpegtools script if at all possible because it takes much longer.
> >>>
> >>>One last problem - the "dsize=4/3" (or "dsize=1.333333") parameter
> >>>doesn't seem to set the aspect ratio in the resulting file. I know
> >>>that this is being really pedantic, but I have heard that VCD MPEG
> >>>video should have it. Can anybody confirm or deny this, and if it
> >>>is required, how do I make it stick on the encoded file?
> >>
> >>dsize is useless, instead add to lavcopts ...:aspect=4/3:...
> >
> >Thanks, that did the trick. It all seems to be working now, and it is
> >considerably more elegant than the mjpeg tools solution with stripping
> >out the audio and video separately, transcoding them, and only then
> >recombining them. :-)
>
> almost :) you had better install libdvb from www.metzlerbros.de and run
>
> dvb-mplex -t XVCD -o dest.mpg orig.mpg




Will these mpg files: dest.mpg  and orig.mpg be  situable for TV-Out  ? 
I mean, using this script for recording VCD using mencoder.
Could anyone answer me.