Re: [VCDImager] SVCD Total bitrate?

[Wiljo Heinen]

> What is the total muxed bitrate (audio+video) for a compliant svcd?
>
> I always thought it is 2723.4375 kb/s (2,788,800 bps)
> ((2,788,800 bps = (/1024) 2723.4375 kb/sec total max. ))

The max sector rate is 150 sectors/sec.
So max total bitrate is 150 sect./sec x 2324 Bytes/sect. * 8 bits/Byte =
2,788,800 bps

So your number is right, regarding the total bitrate...
... whis is is (1)audio + (2)video + (3)muxing-overhead + (4)possible
padding

>
> Thats right isn't it?  Because i read different things everywhere :)
>

That is because the definition of what "muxed bitrate (audio+video)" means,
differs from Site to Site ;-)

Nevertheless you can not just subtract the audio bitrate from 2,788,800 to
get the maximum available video bitrate...
having for example 192 kbps audio leaves less than 2,596 kbps for video,
because you have to take (3) and (4) into account:

(3) Minimum muxing headers (MPEG PES + PACK headers) PLUS if one adheres
striktly to the SVCD-Standard
     there should be SVCD-Scan-offsets for every I-Frame. Both eat space on
the disk

(4) according to the SVCD-Standard, video access points (that is essentialy
video sequence headers) must start at a sector
     boundary. therefore one might have to pad the last sector, eating even
more space.

regards

    wiljo