Re: [VCDImager Bugs/Devel] Svcd : DIVIDO perfect !!!!! (fwd)

[Jens B. Jorgensen]

Herbert Valerio Riedel wrote:

> welcome back! :-)
>
> On Sat, 20 Jan 2001, Andrew Stevens wrote:
> > On Friday 05 January 2001 18:23, you wrote:
> >> ....just wanted to let you know....
> > Hi Herbert,
>
> > O.k. next stage for mpeg2enc is to produce SVCD streams.  What is the state
> > of play with vcdimager.   Does it suffice to generate a plain SVCD compliant
> > MPEG-2 program stream (I have the parameters I need from the guy who offered
> > to look stuff up).   Or do you also need a file with indexing information?
>
> no indexing information required...
> ...just valid mpeg streams with the usual 2324 byte blocksize :-)
>
> ...btw, (vcdimager doesn't need/use it yet, but the svcd standard may
> require it), there ought to be scan/indexing information in mpeg "user
> data" blocks...

As Herbert suggests, SVCD's use User Data blocks in the MPEG2 stream to 
implement "trick play" features, i.e. jumping forwards and backwords. I don't 
have the standard in front of me at the moment but basically a User Data block 
is included at the end of each I frame indicating the sector offsets of some 
incremental points in time (don't remeber exact amount in seconds, one is 5 
seconds) of I frames forwards and backwards in time. These blocks are not 
mandatory.

> > Also do you have any reference SVCD program streams I could download
> > someplace so I can compare mpeg2enc's efforts with a "known good and 
> > working"
> > stream?
>
> sure... (will send you a separate mail for that)
>
> --
> Herbert Valerio Riedel      /     Finger address@hidden for GnuPG Public Key
> GnuPG Key Fingerprint: AC2A CD57 A5C8 A1CB 0A18  DA95 CB0B DB23 60B6 16F5

--
Jens B. Jorgensen
address@hidden



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