[MPlayer-advusers] ID_DEMUXER=nuv + ID_VIDEO_FORMAT=RJPG --> no picture ?!

[Reimar Döffinger]

Hello,
On Mon, May 28, 2007 at 01:38:55AM +0200, tormen at gmx.net wrote:
> As I don't know what a "quantizer" is, I wanted to ask:
> 
> So there is missing some information normaly stored in (the header? of) 
> a .nuv file here?

Yes, in the section that starts with "DR". That section actually even is
in that file, but it contains only 0, so that any data in the file is
multiplied with 0 before it gets displayed - resulting in the green
frame. Unfortunately that does not seem to be the only problem.

> Are the missing quantizers part of the .nuv container format or part of 
> the RJPG video compression?

Not sure what exactly you mean.

> And is this information that is missing just one number (a quantizer) or
> many numbers?

2 * 64 numbers.

> And these quantizer were also not part of the nuvinfo output I appended 
> to my first posting?
> (like rtjpeg_quality:  170 or seektable_offset, height, width or 
> aspect)

No, but they probably can be derived from the quality setting, I
currently know neither the formula nor where the appropriate place to
put this is.

> If you or someone could give me (short) answers on this questions
> I would be hoping to have better chances to get this changed/fixed from 
> the mythtv side.

I first assumed the values are supposed to be derived from the quality
setting to save the space for 2*64 ints in the file, but that space is
still wasted in that file.
You could also ask them if they happen to have a specification around...

> I know that I can't expect anything here.

I didn't say I wouldn't fix it, I just don't know yet exactly when and
how.

Greetings,
Reimar Döffinger