xvid - tcm and lol smooth but nbs choppy

[joanne__king]

I have a number of xvid avi files. Although most of them play well,
certain ones are very choppy and blocky. This is consistant through a
number of players. I have noticed that the choppy avi files are tagged
with {nbs} and are about twice the size of the others, though they run
the same length. tcm and lol xvid run fine. Video is always OK.

I've checked the files through G-Spot and other programs and they all
check out fine for codecs. I think it may be the type of compression,
but don't enough to check this theory further.

Any help?

 

[bxf]

If they run the same length but are twice the size, the frame rate
could be much higher (Gspot will tell you that). That doesn't explain
the playback problems, of course. If anything, I'd expect smoother
playback with a higher frame rate. Also, you don't indicate whether the
bitrates are the same for the good and bad files.

We don't know which decoder you are using, but to see if that's where
the problem is you can try FFDSHOW (latest versions from www.
afterdawn.com) and see if it makes any difference. Be sure to enable
FFDSHOW's XVID box.

 

[joanne__king]

If they run the same length but are twice the size, the frame rate
could be much higher (Gspot will tell you that). That doesn't explain
the playback problems, of course. If anything, I'd expect smoother
playback with a higher frame rate. Also, you don't indicate whether the
bitrates are the same for the good and bad files.

We don't know which decoder you are using, but to see if that's where
the problem is you can try FFDSHOW (latest versions from www.
afterdawn.com) and see if it makes any difference. Be sure to enable
FFDSHOW's XVID box.

The frame rate on both files is the same (23) Differences are the Data
Rate (smaller file is 142, larger is 293) and that the larger file is
12 bit, and smaller is 24 bit.

Only the files that are xvid-nbs have the problem. All other formats
play fine.

 

[bxf]

I am not sure what you mean by "data rate". Is it the BITRATE (in Kb)?
And where do you see the 12 bit/24 bit info (I don't recall GSpot
showing that info, and I don't have it here to check it out)?

The bit of work I've done with Xvid did not show me anything with
nbs/tcm/lol, so these terms mean nothing to me.

What you may want to try is VirtualDub (a free jewel of a program -
thanks Avery), which you can use to convert an AVI to one with
different compression attributes.