[XviD-devel] Scrolling motion problem..

[Michael Militzer]

Hi,

it seems like the 'jerkyness' may come from b-frames not being correctly
decoded (or rather: not decoded at all). You describe that as soon as
a fade occurs, the movie plays smoothly again - well, it may be very likely
that no b-frames are used during that fade and that therefore the video
plays smoothly again.

So now the next thing we need to figure out is: what do you use to play
back this video? Are you sure that XviD is used for decoding (and not DivX,
ffdshow or something else)? What happens if you open the video in 
VirtualDub - still jerky? Did you use the packed bitstream option for
encoding the clip or not? Depending on what you've selected so far, try
en- or disabling packed bitstream.

bye,
Michael

Quoting "Hans K. Rosbach" <hk at circlestorm.org>:

> I was testig Xvid 1.0.0 out yesterday, and noticed a problem..
> 
> During the intro of "Narnia - The lion, The witch and the closet",  the
> image scrolls downwards. When it only scrolls, I get a very jerky motion
> as the image jumps downwards. But as soon as something else also
> happens, such as the whole image fading over into another while at the
> same time scrolling downwards. Then it scrolls smoothly like it should.
> After the fade it starts to jerk again.
> 
> At first I thought it appeared because of a bug with GMC combined with
> b-frames, so I disabled GMC. Didn't help. It wasn't caused by too low
> bitrate either. I used most of the available options including trellis,
> turbo,
> lumi masking and adaptive quant. VHQ and motion search at max.
> 
> I haven't had time to test any more, and I'm at work now so I cannot
> produce a demo clip. But if wanted I can make that available after work.
> 
> Is this a known bug?
> If so, it was there in 1.0.0 RC4 too.
> 
> -=Dead2=-
> 
> 
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