Hardware limit or Driver issue?

zsl1005 · 10-07-09, 06:08 PM

I see the h.264 decoding limits about G98 at here:
http://www.nvnews.net/vbulletin/show...09&postcount=3

Code:

G84, G86, G92, G94, G96, GT200

These chips support the following VdpDecoderProfile values:

o VDP_DECODER_PROFILE_MPEG1, VDP_DECODER_PROFILE_MPEG2_SIMPLE,
VDP_DECODER_PROFILE_MPEG2_MAIN:

o Partial acceleration.

o Minimum width or height: 3 macroblocks (48 pixels).

o Maximum width: 128 macroblocks (2048 pixels).

o Maximum height: 170 macroblocks (2720 pixels).

o Maximum macroblocks: 8192


o VDP_DECODER_PROFILE_H264_MAIN, VDP_DECODER_PROFILE_H264_HIGH:

o Complete acceleration.

o Minimum width or height: 3 macroblocks (48 pixels).

o Maximum width: 128 macroblocks (2048 pixels).

o Maximum height: 170 macroblocks (2720 pixels).

o Maximum macroblocks: 8192




G98, MCP77, MCP78, MCP79, MCP7A

These chips support the following VdpDecoderProfile values:

o VDP_DECODER_PROFILE_MPEG1, VDP_DECODER_PROFILE_MPEG2_SIMPLE,
VDP_DECODER_PROFILE_MPEG2_MAIN:

o Complete acceleration.

o Minimum width or height: 3 macroblocks (48 pixels).

o Maximum width or height: 128 macroblocks (2048 pixels).

o Maximum macroblocks: 8192


o VDP_DECODER_PROFILE_H264_MAIN, VDP_DECODER_PROFILE_H264_HIGH:

o Complete acceleration.

o Minimum width or height: 3 macroblocks (48 pixels).

o Maximum width or height: 128 macroblocks (2048 pixels).

o Maximum macroblocks: 8192

o Unsupported widths: 49, 54, 59, 64, 113, 118, 123, 128 macroblocks
(784, 864, 944, 1024, 1808, 1888, 2048 pixels).


o VDP_DECODER_PROFILE_VC1_SIMPLE, VDP_DECODER_PROFILE_VC1_MAIN,
VDP_DECODER_PROFILE_VC1_ADVANCED:

o Complete acceleration.

o Minimum width or height: 3 macroblocks (48 pixels).

o Maximum width or height: 128 macroblocks (2048 pixels).

o Maximum macroblocks: 8192

and the WIKI tell me:

Code:

Feature Set B

    * Complete acceleration for MPEG-1, MPEG-2, VC-1/WMV9 and H.264

All feature set B hardware cannot decode H.264 for the following widths: 769-784, 849-864, 929-944, 1009-1024, 1793-1808, 1873-1888, 1953-1968, 2033-2048 pixels.

G98 with set B is newer than G84, G86....etc with set A, but its h.264 decoding ability is weaker than the old hardware. I have a laptop with 9300mgs, and I'm really confused by this problem, any one can tell me the reason? Hardware limit or Driver issue? By the way, there is no width limits about PureVideo on Windows platform.

cehoyos · 10-08-09, 01:59 AM

Quote:

Originally Posted by zsl1005

Hardware limit or Driver issue? By the way, there is no width limits about PureVideo on Windows platform.

I did not test myself, but Stephen Warren explained several times that the same limitations can be seen on Windows too (so it is a hardware limitation).

Carl Eugen