Play xvid with sigma em8471

[xuxingjian]

I am trying to using a sigma designes' em8471 mpeg-4 decoder chip to play a xvid a file. but i get some trouble.
If i use some tools such as Flaskmpg to encoding using xvid filter.
I get a avi file. I decode it by em8471 nomorly.
I modify the example file odivx_enc_dec.c to encode a
xvid file, when I decode it by em8471, I get some error.
When sence change in the movie, the screen splash quickly.
The same file encode by opendivx is decode by em8471 right.

what wrong?

[Fl0ppy]

i just a suggestion,are you tried to change the fourcc??pu tin to divx compatible mode, maybe works.:confused:

[xuxingjian]

But forcc only avaliable in filter encode mode.
:confused:

[Schultz]

If you installed Nic's or Koepi's builds you will have a avic program which will change the FourCC of the avi. just use that and change it to divx

[xuxingjian]

But I don't want to encode it as a avi file.

I see some discuss of secence chages I frame bug.
I hacked the code let it only code I frame at first.Others frame
are all of P frame.
Things get better.

But I can not visite the xivd.org to get new code which have chaned the bug. Who can mail me one?

my mail:
xuxingjian@netchina.com.cn

[-h]

This is strange, the output should be identical between flaskmpeg and odivx_enc_dec.c so I'm not sure where the problem is creeping in.

Is the build of xvid.dll that flaskmpeg is using built with the same core cvs as odivx_enc_dec.c? Perhaps this is a problem introduced by the altered VOL/VOP writing code, which I think happened pretty recently.

-h

[ChristianHJW]

AFAIK all MPEG4 decoder chips on the market do only 'simple profile' .. is XviD still compliant with that ? I thought its 'advanced simple profile' ?? Wrong ?

[Alexy]

see the web site they tell the suport on the chip
MPEG-4 advanced simple profile level 5*
problably is a problen on xvid

http://www.sigmadesigns.com/products/xcard_features_specifications.htm

Video Decoding:


--------------------------------------------------------------------------------

MPEG-4 advanced simple profile level 5*
MPEG-2 MP@ML
MPEG-1
720x576 maximum source resolution


* without 1/4 pixel and global motion compensation

[xuxingjian]

haha
I have correct this error.
Some bitstream defineed was diffrent with opendivx.
I hacked the xvid code and now the decoder is work.

[Alexy]

you cand send me the binari or post a link to test on my xcard :)

[xuxingjian]

This is the lib hacked by me.
you can link it with you program

[xuxingjian]

sorry.
I don't know how to attach my file
If you really want it, you can give me your email address.

[-h]

What part of the bitstream did you change? I'm guessing it was either the low_delay fix for B-frames (as agreed with ffmpeg), or the fbase/fincr fix.

Was there a bug that you fixed, or did you just revert to the older behaviour?

-h

[xuxingjian]

It is maybe not a bug.
I see the latest cvs xvid source have add the furture .But when i run the programe build by the latest source.It's crash at the init code. So i hacked the code by myself.
This is only for support em8471 chip.

[chemmajik]

So what kind of results are you getting? Have you tested any interlaced 640x480 or higher 720x480(576)resolutions?

[xuxingjian]

sorry, I only test 352x288.
Now i am doing another project,I will test it when i have time

[rui]

Ok, it's a little bit off topic but i just saw this at xbilt labs.
They describe the ATI's R300 specs, and in the end it says:

Hardware MPEG-1/2/4 and DVD decoding (hardware motion compensation and DCT/IDCT).

Here is the link: http://www.xbitlabs.com/news/story.html?id=1024462399

[HomR]

:cool:

http://www.myhard.com/20020617/ati_r300_5-a.jpg
http://www.myhard.com/20020617/ati_r300_6-a.jpg

:)