[Ffmpeg-devel] Re: ffmpeg "wide" atom

Michael Niedermayer michaelni
Tue Aug 22 22:39:27 CEST 2006


On Mon, Aug 21, 2006 at 02:48:52PM +0200, Baptiste Coudurier wrote:
> Hi
> Richard S. wrote:
> > hannes schrieb:
> >> i'd just like to tell you that not all mp4 players support the wide atom (e.g.
> >> PV Player, Nintendo Play-Yan).
> >> is there a workaround? or can this part of the code be modified?
> >> thanks
> >> hannes
> >>
> >>
> >>   
> > I couldn't find anything about the "wide" atom/box in the MPEG 4 spec,
> > it seems only be  mentioned in the QuickTime File Format.
> > 
> I didn't find anything either. Attached patch always write 64 bit mdat
> atom instead of using 'wide' atom.

maybe mp4 doesnt mention "wide" but it should IMHO mention someting like
"unknown atoms must be ignored" without that iso could never add a new
atom without breaking all existing demuxers, that seems unlikely to me

furthermore always writing a 64bit mdat will break demuxers which dont
understand it

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In the past you could go to a library and read, borrow or copy any book
Today you'd get arrested for mere telling someone where the library is

More information about the ffmpeg-devel mailing list