[Mplayer-cvslog] CVS: main/DOCS/tech mpcf.txt,1.7,1.8

[Andreas Hess]

On Fri, Feb 07, 2003 at 01:35:23PM +0100, Michael Niedermayer wrote:
> On Friday 07 February 2003 12:39, Andreas Hess wrote:
> > What about VLFH (variable length frame headers ;-))? I think often
> > there will be a long stream of frames with nearly the same header,
> > where for example just the lsb_timestamp changes. So you can use a
> > mask (something like 00010) to distinguish that a particular frame
> > header consists of nothing more than the lsb_timestamp.
> yes, but there isnt that much in the frame header, its just 
> the pointers to the next/prev frames
> 8bit flags (the zero bit is here too)
> stream id (normally 1byte)
> lsb_timestamp (normally 1byte)
> the msb_timestamp & checksum are only coded for some frames so they dont count

Ok, but after reading your spec about MPCF the definition of and the
difference between checksum and frame_checksum isn't clear. You say
that frame_checksum depends on checksum_flag, but in the definition
of frame you use checksum, when checksum_flag is set.

And what about no checksum at all in plain frames, allowing the
checksum (or frame_checksum) just in keyframes, and there the
checksum is the checksum (or frame_checksum) over all previous
frames.