> From [EMAIL PROTECTED] Thu Sep 4 10:45:39 2003
>
> > Based on the values I used to encode the mpeg2 files I've been
> > testing with "dvdview", it seems that the reported value of bitrate
> > is always 2.5 times the value I encoded at. So if I set the
> > max bitrate at 10000, the reported value is 25000. Which means,
> > I can easily figure out the actual value, but I'm still very
> > curious as to why the number is multiplied.
> Usually the bitrate reported by a mpegplayer is the maximal bitrate. Set
> somewere in the header.
Which now leaves me with two questions:
1) why is the value 2.5 times what I set as the maximum rate?
2) why would the bitrate (and other values which really didn't
change much) either a) be stored in the mpeg-2 file
every 15 frames or so, or b) why would dvdview printout
the SequenceHeader every fifteen frames, if it was only
stored at the beginning of the mpeg-2 file?
> > And, I'd also like to know what some of the other values reported
> > with each SequenceHeader are:
> > VBV buf.size -- generally reported as 112, except from
> > an mpeg-1 trailer I downloaded, which reported 3.
> > aspect code -- always seems to be 2 for mpeg2enc output
> > (including an SVCD), and 1 for an mpeg-1 file
> > I have.
> > constrained -- no idea. It was always false except the
> > mpeg-1 trailer.
> > profile -- don't know, but possible values are: Simple,
> > Main, SNR, Spatial and High.
> > level -- don't know, but possible values are: Low, Main,
> > High and High1440.
> I guess that the aspect code is directly compareabel with the mpeg2enc
> -a display aspect ratio codes. And 2 would mean 4:3.
> The level/profile option look like it has something to do with HD-TV.
> I have no idea about the other values.
Okay, thanks for the help.
> Berni the Chaos of Woodquarter
Bill
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