[NUT-devel] NUT samples / NUT muxer?

[Oded Shimon]

On Mon, Mar 27, 2006 at 08:58:22AM +0100, M??ns Rullg??rd wrote:
> 
> Oded Shimon said:
> > On Mon, Mar 27, 2006 at 08:06:46AM +0100, M?ns Rullg?rd wrote:
> >> Rich Felker <dalias at aerifal.cx> writes:
> >>
> >> > On Sun, Mar 26, 2006 at 11:57:48PM +0100, M?ns Rullg?rd wrote:
> >> >> Hi all,
> >> >>
> >> >> I thought it would be a good test of the NUT spec to see if I, not
> >> >> having followed the design discussions at all, could implement a
> >> >> demuxer (and later a muxer) only reading the spec.  To test whether I
> >> >> got it right, I'd need some samples or a way of creating some.  The
> >> >> muxer in the libnut repo tells me it creates broken files, and the
> >> >> lavf implementation is badly outdated.  Is there anything that does
> >> >> create proper NUT files?
> >> >
> >> > The muxer in the libnut repo is correct, to the best of our knowledge.
> >
> > Speaking of which, that's why it would be good if ffnut was synced, so we
> > can check that libnut is nicely compliant...
> 
> As I said, I started implementing a (de)muxer from scratch.

Ah, yes, it's even still quoted in this mail. :) BTW, you should read:
http://wiki.multimedia.cx/index.php?title=NUT

It has a detailed explanation for keyframe exact seeking in NUT...

Your de/muxer from scratch is gonna be in lavf?..

> >> OK, so what's with this:
> >>
> >> $ ./nutmerge
> >> ==============================================================
> >> PLEASE NOTE THAT NUTMERGE FOR NOW CREATES _INVALID_ NUT FILES.
> >> DO NOT USE THESE FILES FOR ANYTHING BUT TESTING LIBNUT.
> >> ==============================================================
> >> bleh, more params you fool...
> >
> > read README
> 
> I did:
> DO NOT USE NUTMERGE FOR _ANYTHING_ EXCEPT TESTING!!
> IT CREATES COMPLETELY INVALID BROKEN FILES, WHICH JUST "HAPPEN" TO WORK!
> 
> So you're saying the files are OK after all, at least for some inputs?

Well, in a very hackish way, nutmerge actually DOES generate valid files in 
the case of MPEG-4 ASP with vbr MP3 in AVI, and Vorbis in Ogg. But it's 
bad hack and could easily fail in some cases. (like, doesn't handle zero 
byte frames from mencoder)

- ods15