[FFmpeg-devel] [RFC] special "broken DV" demuxer

Michael Niedermayer michaelni
Tue Mar 10 15:52:56 CET 2009

On Tue, Mar 10, 2009 at 09:18:56AM +0100, Reimar D?ffinger wrote:
> On Mon, Mar 09, 2009 at 04:40:13PM -0700, Roman V Shaposhnik wrote:
> > On Sun, 2009-03-08 at 18:28 +0100, Reimar D?ffinger wrote:
> > > in our samples there is one horribly broken DV file:
> > > http://samples.mplayerhq.hu/V-codecs/DVSD/pond.dv
> > > As far as I can tell (with my limited understanding of the DV format)
> > > this is basically some DV headers "randomly" placed and then
> > > the data essential to decoding DV written over it.
> > 
> > Huh? pond.dv used to be a perfectly good DV sample.
> My judgement is limited since I never read the DV spec, but I find it
> hard to believe that a file without header, audio or video sections,
> half of the bits marked as "reserved, must be 1" in our encoder set to 0
> etc. qualifies as "perfectly good".

Ive not checkd the spec but in general i interpret "reserved" as
* encoder must set it to the value the specific spec says
* decoder must not depend on its value
* future specs may use reserved values differently and thus future
  encoders may set them to different values.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Concerning the gods, I have no means of knowing whether they exist or not
or of what sort they may be, because of the obscurity of the subject, and
the brevity of human life -- Protagoras
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
URL: <http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/attachments/20090310/efbffd43/attachment.pgp>

More information about the ffmpeg-devel mailing list