[M4IF Technotes] Re: Downloadable standard MPEG test sequences

[Ralph Sperschneider]

Ralph Sperschneider wrote:
> 
> Olivier Amato wrote:
> >
> > Ben,
> >
> > > So, there really isn't a .yuv file format, then?  Just a bunch of
> > > mutually incompatible formats with the same extension, and no
> > > programmatically way to discriminate between them.
> >
> > .yuv files are generally provided in the 4:2:0 color space and are plane
> > oriented ( for each frame, all Y samples, then all U samples and finally all
> > V samples ). There is no header ( so, no way to guess picture's width /
> > height and frame rate ), only raw data with Y, U and V components of each
> > frame stored consecutively. Each sequence is generally provided in 2 formats
> > ( CIF and QCIF ) and sometimes you can find .cif and .qcif files' extensions
> > to differentiate them ...
> > But this is not always the case, sometimes .yuv files are stored in the
> > 4:2:2 color space and each frame is organized by pixel, with each component
> > stored consecutively ( as VQEG sequences for instance ).
> >
> > >     Well, in that case we should convert them all the the 2vuy QuickTime
> > > files or whatever and make THAT the de facto standard.  The file format
> > for
> > > those is fully public, and obviously familiar to MPEG-4 folks.  And it
> > would
> > > remove ambiguity and vastly increase the number of tools that can use the
> > > standard test sequences.
> >
> > I totally agree, it would be much easier to get a real file format for video
> > test sequences ...
> >
> > Olivier
> 
> Olivier, all,
> 
> assuming you are talking mainly about MPEG-4 video test sequences: Is there anything that restricts the video community to use the MPEG-4 file format?

Sorry for this misleading comment. The file format is of course not intended to store _uncompressed_ video data ;-)
Best regards,
Ralph
-- 
Dipl.-Ing. Ralph Sperschneider  | Phone: +49 9131 776 344
FhG IIS-A                       | Fax:   +49 9131 776 398
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