DVD/DIVX player - some XVID files plays, some not

[Jeremiah58]

Hi,

I've bought my first DVD player which supports DIVX and MPEG4.
It's Smartvision model 935. The first day I bought it, I upgraded the firmware because of a better subtitle support for my native language. It seems that it has Mediatek chip inside, which is probably a good thing.

Darn thing plays all version of DIVX very good and smooth with excellent support for subtitles in srt, sub, ssa...
But there is a problem with some XVID files. While it plays the most XVID's, some XVID's plays slow and "jumpy". I've checked those files with AVIcodec and I can not see anything different from other XVID's which play fine.
I would like to know why this problem occurs and is this a case with other similar players? Thank you.
By the way, I burn those avi files and their subtitle files on Verbatim DVD discs.

[steveryan]

Sounds like packed bitstream, use MPEG4Modifier to unpack.

[jagabo]

http://www.jarnot.com/twiki/bin/view/Public/DVP642LisaBsAVIGuide

[Jeremiah58]

Hm, strange.
I was just about to tell you that I've already tried that, but MPEG4Modifier refused to open those files, when I decided to try again and now it does open those files.
I'm going to try that and I'll report back.
Thank you steveryan.

[Jeremiah58]

OK I used MPEG4Modifier to open the sample file and to unpack bitstream. After that I burned the resulting file to CD and tried it in my player, but the problem remains.
These are video informations before unpacking:

Packed bitstream: Yes
QPel: No
GMC: Yes (3 warp points)
Interlaced: No
Aspect ratio: Square pixels
Quant type: H.263
FourCC: XVID
User data: DivX999b000p
XviD0036

and after unpacking:

Packed bitstream: No
QPel: No
GMC: Yes (3 warp points)
Interlaced: No
Aspect ratio: Square pixels
Quant type: H.263
FourCC: XVID
User data: XviD0036

Any further hint, please.
Thanks jagabo for the link - nice reading. It seems that GMC is the problem, isn't it?

General information from AVIcodec are:
Video : 453 MB, 823 Kbps, 23.976 fps, 656*288 (2.21:1), XVID = XVID Mpeg-4
Audio : 246 MB, 448 Kbps, 48000 Hz, 5 channels, 0x2000 = AC-3 ACM Decompressor

Thank you.

[jagabo]

Yes, it looks like GMC is the problem. You will have to reencode.

[Jeremiah58]

I could watch those problematic XVID files on my laptop or my desktop which has s-video connection to my TV, no problem, but I'm just curious about reencoding.
What options would you choose to reencode that particular video?
Thanks.

[jagabo]

I would use VirtualDubMod. The basic procedure after starting the program:

File -> Open Video File
Video -> Fast Recompress
Video -> Compression... select Xvid, press Configure, press Load Defaults.
File -> Save As.

That will probably make the file a little bigger but it's fast and easy.

A lot of people use a program called AVIRecomp for this. I don't know anything about it though.

[Jeremiah58]

Thank you very much, jagabo. I appreciate your help.
I will try the reencoding.

[jagabo]

Of course "fast" is a relative term here!