Noise around people

[vio_man]

I noticed that my XviD encoded movies have some noise around people (mosquito noise :p ). What should I do to remove or smooth that noise?
I'm using the following options for 2 CD's movies:

Motion precision: 5
Quantization type: MPEG
VHQ Mode: 1
FourCC: XVID
DX50-VOP compatibility enabled

All the other options are disabled.

What should I change?

NOTE: This settings are for 2 CDs (> 1h30m) movies.

Thank you.

[gamr]

motion precision to 6
vhq to 4
tick chroma motion

make sure your using koepi's latest unstable (better vhq) and try tweaking the b frames

2/150/100/20 gives me good results (anything upto 5 bframes on anime but thats different)

weather you are going for 1 or 2cd you really should increase vhq and motion precision

id also try h263 instead of mpeg, h263 smooths a little and has less mosquito noise. otherwise try a custom quant matrix but thats a little more advanced.

also open the stats file in statsreader and see what the size it shows in there, you want to target 60+% of that size to get nice quality. i aim for 80% on most things but thats just me.

[vio_man]

Well, I'm have a Duron@800MHz processor. Doesn't the motion precision to 6 and vhq to 4 takes too much time?
I'm using the Koepi's build from May 3,2003.

[Nibor]

Hmm, that depends on how you set your priorities...
Motion Search Precision 6 doesn't slow down your encoding that much. VHQ set to 4 will decrease speed about 30% (well, that's only my experience...)
The compressibility will increase so the whole movie gets better quality =)

By the way, I just started using XviD a month ago (before I used DivX, sorry :rolleyes:) and I read as much as I can in the forums and on doom9 to improve my skills and my knowledge....

PS: That's my first Post :D

[JimiK]

You should definitely set motion precision to 6, the speed penalty won't be that bad. VHQ can take up some time, so if you want acceptable speed, then you can stick to VHQ1 and won't loose to much quality.
If you want to get rid of the mosquito noise, then you should try one of ReferenceDivX's hvs-matrices. HVS-good blurs a bit more, but eliminates all mosquitos for me ;) (this matrix is great for 1CD rips).
Best regards,
JimiK

[Nibor]

Ok, my question doesn't belong to this thread, but I often read about using a custom matrix and there's only mentioned the name of a matrix, not where I can get it!? A forum search didn't help (some attachements seemed to be missing in some threads)...
Where can I get custom matrices, is there any site about that?
Some links would be very nice :)

Thanks!
Nibor

[gamr]

hahaha, i never said fast, you wanted ways to reduce/remove mosquito noise, these are the best unless you up your post processing in ffdshow but post processing it away isnt as good as not encoding it in the first place.

may 3rd build is the 1 i was refering to, yes, its working well for me.

as for the quant matrix's refered to by name, just search the forum for them, they are attachments on various posts.

i really suggest motion to 6 and chroma motion, vhq4 is something that i do but i have an amd 2400+ so its not so bad. assuming you have time, compare for yourself, do 2 pass's with vhq4 and 2 with vhq0 and have a final avi that you would burn and decide for yourself which is better. simple isnt it? ;)

[Nibor]

Thank you!
I found andreas matrices, but still none of the hvs matrices...
Ok, this thread is about the hvs matrices:
New HVSmetrics matrices (http://forum.doom9.org/showthread.php?s=&threadid=34493&highlight=hvs+matrices)
-> Am I blind or is there an attachement missing!? :confused:

[frodoontop]

In this thread:
hvs_matrix (http://forum.doom9.org/showthread.php?s=&threadid=49917&highlight=andreas+matrix)

[kaitsuburi]

@vio-man

Since you're going for 2 CDs, your bitrate should be pretty high and compressibility shouldn't be a big issue. vhq=1 should be fine IMHO; chroma and motion search precision 6 should help you increase quality without too big of a speed hit.

Also, have you looked into slight avisynth filtering? A gentle TemporalSoften or TemporalCleaner with Undot() would help you get rid of mosquito noise.

-kaitsuburi

[symonjfox]

Who needs speed? IMO quality has priority over speed, and I'll never disable any quality feature just for few more speed ...

I had a Duron 600 too and I know how much time I spent for my first encodings, but keep in mind that now you can buy an Athlon XP or P4 at few money (yes, don't buy 3Ghz processors ...).

I suggest you to set Virtual Dub Mod (or whatever you use) and save the project; then start it when you're going to work (or school) or when you're sleeping (yes, if the computer fan doesn't annoy you).

Back to the topic:

Mosquito noise is noticeable when you encode cartoons or if you use very low bitrates.

I think that for a 2 CD rip, you shouldn't have them; Try to use H263 quantizzation, it's blurry (not so much) but it's no bad.

[vio_man]

But I've heard that for 2CD's I should use MPEG and for just 1 CD use H.263
Am I right? Or should I use always H.263?

[gamr]

personally mpeg matrix is just plain bad, it introduces a LOT of artifacts, try out some of the custom quant matrix's (hvs good and hvs better are my 2 favourites)

h263 will smooth things a little and loose some fine detail but it avoids a LOT of mosquito noise.

like i said in my last post, try it for yourself and see what you like the results of.

[vio_man]

Thank you.

But I would like to see some more opinions about this...

But I've heard that for 2CD's I should use MPEG and for just 1 CD use H.263. Am I right? Or should I use always H.263?

[symonjfox]

H.263 quantizzation encodes the frames a little blurry else at higher bitrates (but it's not so blurry, it just keeps less dettails, but it avoids to create mosquito noise).

MPEG quantizzation encodes the frames sharper than H.263, sharper means that if you want better results, you must use an high bitrate (so 2 CDs request). Being sharper, there's the possibility of creating noise somewhere.

Custom matrixes can be used. I don't understand so much about matrixes, but if they are well tuned, they could give us better quality or better compressibility.