On Wednesday 29 March 2006 00:04, Vladimir Ivashchenko wrote:
> On Tue, 2006-03-28 at 23:01 +0200, Hans Verkuil wrote:
> > On Tuesday 28 March 2006 22:49, Vladimir Ivashchenko wrote:
> > > Hi,
> > >
> > > It seems that even though I set bitrate_mode to 1 (CBR) the
> > > content is still not CBR. If I check it with various tools (such
> > > as tcscan) they show different peak and average bitrates.
> > >
> > > Any ideas?
> >
> > I've seen that before. CBR may not work or only poorly. Could you
> > try with some different stream_type values? I've always wondered if
> > it might work with a specific stream type. Another point to look at
> > is the bitrate values. Try to experiment with different peak values
> > for example.
>
> I went through all stream_type values. The only value where CBR
> worked is 2 (MPEG1) and 11 (VCD). In case of MPEG1, it was encoding
> at the bitrate I specified (3 mbps), in case of VCD it switched to 1+
> mbps.
And if you select VBR for streams 2 and 11 it will also come out as VBR?
If so, then I suspect that they implemented CBR only for MPEG1 streams.
Hans
>
> However for my application I need to have CBR in MPEG2. Reason being
> is that I record this stream into Kasenna VOD server and for it to
> work properly stream should be CBR, and MPEG1 the quality is
> noticeably lower.
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