[M4IF Technotes] Help with MPEG-4 Visual/Natural reference software

Larry Pearlstein lpearlst ati.com
Thu Oct 4 12:04:10 EDT 2001


Hi,
I've been playing with the MPEG-4 Visual Reference Software, FDIS version
1.0, Natural, decoder software from both Microsoft and MoMuSys.  I've built
and run both under Visual C++ under WinNT.
I have decoded the reference bitstream vcon-ge1.cmp, which contains the
ping-pong sequence.
The VideoObjectLayer header specifies a rectangular format of 720 x 576.
I trace both decoders, and I see the 720 x 576 dimension at the dump
routine.  But when I examine the output files (planar 4:2:0 YUV, with
multiple frames concatenated in one file) I find that both Microsoft and
MoMuSys seem to produce pictures formatted at 720 x 480.  Any ideas why this
might be happening?
Also, I have tried to subscribe to the MoMuSys reflector, but the EMAIL
address seems bad.  Is there still an active MoMuSys reflector?
				Thanks,
				Larry
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