[vdr] Re: vdr2divx suggestions ? (poll)

[Steffen Barszus <st_barszus@gmx.de>]

On Thursday 31 October 2002 00:10, you wrote:
> [...]
>

First of all someone should definitly correct his line break

> > > For 16:9 this is already done in the vdr2divx scripts !
> > > Now tell me how this can be achieved for 4:3 streams ?
> > > In case we have a 4:3 stream with 480x576 resolution: Should we scale
> > > up to 784x576 ? Producing lot's of redundant information and giving the 
> > > codec too much data for the given bitrate !? Or should we scale down to 
> > > 480x360
> > > (also 4:3) and loose lots of details !??
> > > I prefer to keep the resolution of 480x576 and have the DVBs card
> > > rescale by replaying - thus keeping the original quality !
> > > However i understand that if you target on PC replay the scaling to
> > > 480x360 is an option - so i will add this aswell, later on !
> > >

Ok so we are both right, I just didn't catch the possibility to store it in 
wrong AR to rescale it later. And since avi is used it is a short sight 
solution, just my opinion ... your arguments are right too, just have to use 
vdr for replay ;o) 

For me it has to be scaled to correct AR anyway, so no decission on that 
topic, only if you choose a lower bitrate you have to scaling down. At last 
it is your turn, just my opinion. 

A better container than avi would be for sure the best thing 
OGM ? 
mpeg4ip ? <- supports AR
But seems to be no decission for this version of your upcoming tool.

> > > The main problem is the good (?) old (!) AVI format which has no field
> > > for aspect ratio !
> >

Agree

> > Mencoder can produce OggVorbis, I don't know, but maybe there is a
> > aspect-ratio. Could you live with an additional OggVorbis-option?
> >

To be correct , mencoder can't produce Ogg-vorbis, nor it does it with OGM. 
Ogg-Vorbis is audio-only in Ogg container. OGM is what you meant. Mplayer can 
play it flawlessly, at least in the last version. I think there are things 
like subtitle more then one audio-track and ogg-vorbis as audio track   
possible. Moritz Bunkus did a great work on improving this. He is also the 
one who wrote the ogm-tools. With that you can produce OGM , which is 
supperior to avi and can be read on windows as well as on linux, and offers 
the ability to use mode 2 ( like svcd) OGM-video-cds because of a better 
error detection than avi. Does not know how easy this is possible on linux. 

>
> Ehm - no problem for addition option - but i don't this mencoder can
> produce OGM (yet) and that is what we would need - oggVorbis is just an
> audio format ! OGM is the container to contain video, which could carry the
> aspect - but in fact doesnt if i remember right !

Don't know, maybe we could ask Moritz Bunkus about that.

> Where did you get the info that mencoder supports ogg ? Which commandline
> option !?
>

Isn't possible. Just have to use ogm-tools. But mplayer supports it, for 
replaying.

At least it seems to depend on personal opinion on how to convert. -cropdetect 
should be used for quality issues, 



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