On Wed, 15 Sep 2004, Gernot Ziegler wrote:
> Hej Moshe !
>
> Do you encode the MPEG video only stream yourself, or do you use the
> HDTV code stream that was transmitted ? (put differently: is mpeg2enc
If he is doing the same thing that I do then the HDTV stream was
captured as an MPEG-TS (Transport Stream) from an HDTV receiver
and then demuxed (using ProjectX or other utility) into the
elementary video (.m2v) and audio (.dts). The HDTV broadcasts I
receive use AC3 audio rather than DTS though.
> busy to promise any testing ... maybe someone on mjpeg-users can help you
> nail down the problem ? :-)
The problem was obvious (well, at least to me ;)) and you were on
the correct path when you mentioned:
> > I suspect that you are overloading the SVCD output profile when using a 14
> > MBit stream ... how did you encode the MPEG2 video stream ? - maybe -f 3
> > or a manual -r settings helps ?
> > E:\temp>mplex -r 0 -l 180 -f 5 -o tt.mpg tt-xport1.m2v tt.dts.fixed.dts
"-f 5" is completely incorrect. That sets parameters suitable for
a ~2.5Mb/s video stream and of course those are wildly off for a 14Mb/s
stream.
> > INFO: [???] Selecting SVCD output profile
Yep.
> > > Hey Gents, I have been using the latest version of Mplex to mux high
> > > definition resolution video with DTS audio. Unfortunately, it looks like a
The latest version of mplex (from CVS) is:
mjpegtools mplex-2 version 1.7.0 (2.2.3)
In order to multiplex HD streams it is necessary to increase the
video buffer size way beyond the 220KB used for SVCD and DVD. That's
the real key to muxing high rate streams. I have seen the value
488KB mentioned in references about HDTV so something like this:
mplex -f 3 -b 488 -r 15000 -o output.mpg input.m2v input.ac3 (or .dts)
should do the job. Increase the -r value as needed (up to the HDTV
maximum of 19800). Perhaps "-r 0" would work - I've never used it,
preferring instead to set the value myself.
Cheers,
Steven Schultz
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