Re: [VCDImager Bugs/Devel] 16:9 playback

[Anthony J. Ciani]

On 16 Jan 2002, Herbert Valerio Riedel wrote:
> On Wed, 2002-01-16 at 00:44, Anthony J. Ciani wrote:
> >     I have made some SVCDs with vcdimager which should play
> > back 16:9, and have found that they do not, even on DVD players that have
> > been reported to play back 16:9 SVCDs in a letterboxed manner.  The mpeg
> > streams properly indicate that they are 16:9 (Mplayer and other software
> > players play the streams 16:9).  I have not used other SVCD creation
> > software, and so cannot say that this is a problem with VCDimager, but I
> > am wondering if you might know what is happening?
> what does happen, if you play them?

They are played 4:3, distorted and unclipped.  For reference, the players
that I have played them on are a Philips DV711 and a Pioneer DVD333, both
set for 4:3 letterbox (and they do for DVD, which I believe is flaged in 
the same manner), and both reported to play 16:9 SVCD letterboxed.

> btw, there's nothing vcdimager can do, since the 16:9 attribute needs no
> special treatment according to the specs; the player should figure it
> out by itself when reading the mpeg stream...

Hmm, I kind of thought that... but it obviously isn't reading it from the
stream.  My first thought was that there might be some needed information
missing in the descriptions in the first track.  


It could also be that mplex screws up somewhere in writing the system
stream, and the software players intelligently read around the screw-up,
but I looked at mplex source and don't think this is happening, nor do I
know how it could happen since the aspect is contained in the sequence
header, which mplex just copies.