Black blocks again

[clodomiro]

I've been looking for updated info on the blocks you get when encoding dark scenes even when max bitrate has been achieved. Has anything been fixed? Thanks.

[manono]

Hi-

You talking about DivX 3.11? If so, the answer is it hasn't been fixed and never will be fixed, as it hasn't been developed for a couple of years. Time for you to move on to more modern codecs, maybe.

[clodomiro]

Which one do you suggest for dealing with the afore mentioned issue? Most of the time I'm making 2 cd rips and I've read around here that 3.11 is the best for that, maybe that info is outdated, what do you think? TIA

A.Lanza

[manono]

Hi-

There's nothing really wrong with DivX 3.11. It gives a nice sharp picture, and as you said, is great for 2 CD rips. But you get those black blocks, and also blocks in other solid colored areas, the so-called "motion trails", and sometimes that corruption in the subs and other places that anti-shit was designed to deal with.

If sharpness is a priority, then I'd say that XviD is the way to go. Both XviD and DivX 5.xx also have minor problems with black blocks, but nothing to the degree that DivX 3.11 does, and there are some workarounds. Other than that, I can only recommend that you try them both out, as both have their different strengths.

[MasterYoshidino]

divx can compress low luma better with B frames than XviD, but DivX will be blurrier if you use any Quantizers worse than 2, with B-frames.
XviD goes the opposite route, will make a better picture, but requires more bit rate and if you throw the same rates at both, DivX will look smoother while XviD will macroblock due to bit allocation.

[clodomiro]

I see, thanks man, I'll do a couple of tests as soon as I can.

[themanintheknow]

I have seen this may times, and the horror films with there darkness makes it even worse, I used mp4ui v3 and manualy set for soft edges, lower this as it will make the whole thing to soft and slightly blurred. there are option if you look for them.
the capture size is also an issue trying to make it small right away i think is a bad thing, as it misses loads wich makes the blocks.

I will try to upload something to the net ill be a bit as i want to make it a anon site... well that took a while..

ok heres a url crap sight but hey..http://uk.geocities.com/ilikefilms2003/index.html

ok i placed films clips and codecs on, if you look now ive just did it so give me a hour or so (this sight mod may want to take them as well and place them on this site).

well enjoy

[esby]

To the primary question:

If the blocks you refers are somewhat of a color gradiant in the background,
( blocks appearing due to slight but visible difference in luminance etc.)
Adding noises in the encode may gives you an answer,
for this, use blockbuster for avs ( www.avisynth.org )

if you are talking of codec bug that can appears even when the drf=6000,
try to increment the drf used in nandub for the particular frame
or group of frames using the ecf files,
(meaning @20: CL=3 or CL=4 where the compressor obviously used CL=2)
Of course adding a keyframe can help,
but it can introduces smearing sometimes.

esby

[shariryaniv]

hi.
i also posted a question about the same problem (the blocks/dots),
and got no suitable answer, so i started to encode with VirtualDub program because in virtualdub you can chose to encode in other compressors like Xvid that is 10 times better in its quality (to my opinion) and don’t give the dam spots!!!!!

try it.
yaniv.

[esby]

@yaniv
Of course, virtualDub can encode with xvid...
of course, you'll get better result with xvid,
if you don't want to work on your encode,
(and maybe understand why it was wrong),
but that won't help the people trying to enhance their divx3 encodes...
But back to our topic:

i also posted a question about the same problem (the blocks/dots),and got no suitable answer,

if you use the search function of the forum, you'll find several threads that may help you to understand how to avoid these blocks.
Of course, some people will skip the search and uses xvid,
but at least don't say you didn't find any suitable answer since you obviously not searched...

esby

[shariryaniv]

sorry to tell you that you are wrong!
i did search the forum! and every time i came across a qustion, and i red it, everithing i read was in terms that i didn't anderstand or only anderstood a part of it.
now as you can see my english is full of mistakes and i lerned the encoding stuff all by my self just from reading articles in doom9 and posts that i anderstood here, adding to that the fact that i did try to enhance the quality of divx3 several time, and i gave up becuse every try takes a fwe ours. so if divx3 can't give a result like xvid, let it go! be efective and don't waste my time on it!

the better product wins!

sorry that i was ruff but plese don't judge pepole...
yaniv.

[Teegedeck]

Please remember that everyone is free to choose the codec he/she likes best. Maybe some people (not talking about myself here) just like the 'look' of DivX3.11 and accept that they have to tweak around a lot in order to overcome the codec's problems?

[iago]

I totally agree with Tee here. Maybe he likes only the "look" of it (like I do)! ;)

Also, a good-made nandub sbc rip is still something to watch in this arena imho.

Regarding the original question about black blocks, play with or search about blockbuster and lumafilter/unfilter combo a bit, which might help ;).