[MEncoder-users] High bitrate mpeg2 encoding problem

[Simon Oualid]

Many thanks for your answer.

> Are you sure your source has sufficient quality for 15 Mbps? (non-HD
> resolutions sure wouldn't be).
> And the output is unreadable with what?

My source is 30Mbps mpeg2 SD content (from a matrox capture card), and I
cannot play the output with mplayer (rc1), vlc (0.8.6c), neither Elecard
mpeg-2 DS filters. Each time I got the audio but no video output, I am
retrying with these new options.

I reencode this content before transfering it to match our 15Mbps bandwidth.
What bitrate would you advise for high quality SD content ?

> Not sure they create ps files without extra options.

I'll add these options (-of mpeg -mpegopts ...) once I'll get a proper
encoding (I am actually reencoding the content within mbd=2 and 2 pass
encoding since I do not need speed). What vrc_maxrate, vrc_minrate, and
vrc_bufsize do you  advise for mpeg-ps muxing ?

Here is where I am :

mencoder test-highbitrate.avs -o h:\output.avi -ovc lavc -lavcopts
vcodec=mpeg2video:vbitrate=15000000:mbd=2:vpass=1 -passlogfile pass.log -vf
harddup -oac lavc -lavcopts acodec=ac3:abitrate=192

Thank you again,

Simon


2007/9/3, Reimar Döffinger <Reimar.Doeffinger at stud.uni-karlsruhe.de>:
>
> Hello,
>
> Your report is lacking both mencoder version and output.
>
> On Mon, Sep 03, 2007 at 10:25:32AM +0200, Simon Oualid wrote:
> > What command line you recommand to encode high constant bitrate mpeg2
> > (15Mbps, 30Mbps).
> >
> > I am using -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=15000000 -vf
> > harddup but the output doesn't match the expected 15Mbps and is
> unreadable
> > (I got a 600 seconds movie and the outputted file size is 150Mb).
>
> Are you sure your source has sufficient quality for 15 Mbps? (non-HD
> resolutions sure wouldn't be).
> And the output is unreadable with what?
>
> > Here is my complete command line :
> >
> > mencoder test-highbitrate.avs -o output.avi -ovc lavc -lavcopts
> > vcodec=mpeg2video:vbitrate=15000000 -vf harddup -oac lavc -lavcopts
> > acodec=ac3:abitrate=192 -audiofile f:\026781#02.wav
>
> No mbd=2 and no two-pass. Both mean the quality will be horrible for the
> bit rate. Of course you can throw endless bitrate at it instead of doing
> a proper encode, but that is only good for marketing (or if you need
> speed of course)...
>
> > I tried to use a mpeg-ps container (with -of lavf or -of mpeg).
>
> Not sure they create ps files without extra options.
>
> Greetings,
> Reimar Döffinger
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