Pulsing Image

[Demone]

I still cant understand, but I continue to have this problem.
I told it to koepy and he told me its the quantization type, but its not.I tried divx5 and now its for sure.

PPl who did some tests between divx5 and xvid have surely noticed that xvid is more detailed, u can actually see a noise type of detail
in big zones of similar colors like the sky for example.Its like the real dvd.Divx5 is not like this it tends to eliminate this detail, and u end up with a linear flat image(cleaner) but u lost details too(in my opinion).

THE PROBLEM:
The problem, is that Xvid give not this detail for each frame, it seems to me that only the 70-80% of frames have this kind of noise(and detail) the remaining 20% is more smoothed...washed out...its the same as comparison between bicubic and bilinear resampling.
So the image moving from a detail to another give the impression of pulsing and actually lost a costant detail....I tried the latest build too and didnt solve the problem.Ppl interested should try to look with attention, and will surely understand what I mean.

Let me know :)

[-h]

There's nothing I can think of that could cause this, apart from quantizers jumping around between frames. You're very perceptive to notice that though :)

Could you try encoding a section that "pulses", with XviD's constant quantizer mode? Try quant=2, 3, 4, 5, etc. until you see that your details are gone. The highest quantizer that retains the detail you want, is probably your "cut-off" point.

-h

[MaTTeR]

I've noticed this on a few encodes myself.

Specifically the last 3 comparison tests I ran between Xvid and Divx 5 on B&W source material. It almost like some of the pixels are either jumping or moving between frames. This pulsating effect seems to be more apparent in a grainy image.

@Demone
I'm gald to hear I'm not the only one that clearly sees Xvid retaining more detail than Divx 5. The only thing I would disagree on is that IMO Xvid is holding a cleaner image. Have you noticed how the pixel colors are smeared together in Divx 5? A good test is something like a real light grey object with a darker colored object inside. You can see that Xvid does a hard break between the 2 colors but Divx smears or blurs the two. The other thing I'm notcing more and more is that is that Xvid holds the source colors more true. So all of this gives me the impression that Xvid is just giving me a much cleaner image.

I'm using the latest build as well.

[Demone]

@-h
I'll do some tests and let you know

@Matter
I understand what u mean, but I'm not talking about points that move,
yes, I'v noticed that too, but what I said is that in some frames these points go totally away.

[MaTTeR]

@Demone
Sorry I should have been more clearn or read your post a 3rd time:) I'm seeing what your describing as well but I was thinking it was basically the same issue I posted.

I'm traveling all this week but would be more than happy to post a clip later in the week if needed.