x264 quality

[carlo_0000]

hy

have a question

when i encode a vob or dvb rip to x264 (mkv)
i use 1500kbps 2 pass

some parts of the video have some artifacts, the output is +-0 to 10% badder than the original (especialy on live scene's)

you will say that is normal it's the compression but

when i do the same with a hdtv (live scene) (1080i mpeg)
end using the same bitrate 1500kbps i see no artifacts (quality is very better than a vob) but used a litle higher resolution 800*448

why is the hdtv not with the same quality than a vob rip ? but i use the same bitrate ?

[Selur]

maybe a deinterterlacing problem,.. hard to tell without the settings and scripts you used, a small sample and maybe some screenshots which show the artefacts.

[carlo_0000]

used virtualdub 1500kbps 2pass
i make some print screen you see that on the 2 first pictures are badder , can not see that in the mpeg (can't make print screen i delete it) but mpeg was clean

3rd picture you see olso some left obove

http://perso.latribu.com/tribu//jpg/Girls%20Aloud01.JPG
http://perso.latribu.com/tribu//jpg/Girls%20Aloud02.JPG
http://perso.latribu.com/tribu//jpg/Girls%20Aloud03.JPG
http://perso.latribu.com/tribu//jpg/Girls%20Aloud04.JPG
http://perso.latribu.com/tribu//jpg/Girls%20Aloud05.JPG



here an other 1, dificult to see it on the picture but all what is bleu is degraded when it plays
http://perso.latribu.com/tribu//jpg/DHT10.JPG


end here a Hdrip used the same bitrate but resolution a litle higher
http://perso.latribu.com/tribu//jpg/tiesto01.JPG

[foxyshadis]

mpeg->x264 without filtering to remove artifacts will always look bad, more so if you use one-pass (especially if it's default settings). I'm afraid your report doesn't give any details to go on.

[carlo_0000]

i use deinterlace (blend) in filters

do i need to use other filters ? wish one ?

[CruNcher]

use tdeint it will only deinterlace the moving pixels and after that use deblock() you can disable the inloop deblocker then and save processing time @ decoding alot of processing time :) but tdeint() and deblock() will slowdown your encoding time alot. for the blue thing disable fast skipping. To use tdeint() and deblock() you need to learn avisynth processing good start would be www.avisynth.org or you could also try avidemux www.avidemux.org and/or megui (can be found in the Gui section here ) if you wan't fast results :) if you don't want todo any of this just higher the bitrate and disable fast skipping to reach good quality with DVD resolutions @ that bitrate 1500 you need a clean source remember 1500 is what Film Studios use for UMDs but they have very clean sources and do not encode from allready compressed Material that is in bad shape like yours.

[Sharktooth]

HINT: dont use VirtualDub and x264 VFW. Get a proper GUI for x264 CLI (megui, staxrip, realanime, etc...).

[Sirber]

RealAnime woot woot! ;)

I get squares like that in my anime encode too, with blue gradient, but it's less bad :)

[Dark Eiri]

I would get this same quality with 600kbps using MeGUI and Sharktooth's Insane HQ Profile =/

Sirber: I'm used to encode animes with the AE-Maxquality Profile in MeGUI (I use 268 kbps for cartoons -usually Adult Swim- and 368 for high-detail anime, that rounds it with 32kbps AAC audio) and it looks highly fine! No squares. o.ov

[foxyshadis]

AVC doesn't degrade like ASP; if you see ASP-style blocks, you're really in trouble. AVC gets blurrier the lower the quality. Some QCIF anime can look pretty good at 250-300kbps, but I've never seen CIF anime that looked good (to my eyes, everyone's different) below 550kbps.

[CruNcher]

i might have found a x264 block prediction problem but im not sure if it's related to this stay tuned, it couses flickering like ASP + Bframes but without B-frames and also with very low Quantizer, seems to happen with very sharp sources only tough and it seems to be existant for a long long time allready :(

[carlo_0000]

thanks for the answare


HINT: dont use VirtualDub and x264 VFW. Get a proper GUI for x264 CLI (megui, staxrip, realanime, etc...).

ok but i tri megui but i would like to Cropp the video's

i tryed staxrip but have an error when open a mpeg

most sources are yv12 and thus a yv12 decoder is required the decoder defined in the settings xvidvfw.dll could not be located

i select x264 in setting

[Sharktooth]

Megui is perfectly able to crop the video.

[Terranigma]

thanks for the answare




ok but i tri megui but i would like to Cropp the video's

i tryed staxrip but have an error when open a mpeg

most sources are yv12 and thus a yv12 decoder is required the decoder defined in the settings xvidvfw.dll could not be located

i select x264 in setting

you can use
converttoyv12(interlaced=true)
crop(custom size here)

in avisynth, and load it in megui.

I presume the source is interlaced, tis is why I added (interlaced=true) in the script, otherwise change true to false if it's progressive.

[Sharktooth]

megui is also able to detect interlacing (avisynth script creator) and use the appropriate deinterlacer...

[Sirber]

I would get this same quality with 600kbps using MeGUI and Sharktooth's Insane HQ Profile =/

Sirber: I'm used to encode animes with the AE-Maxquality Profile in MeGUI (I use 268 kbps for cartoons -usually Adult Swim- and 368 for high-detail anime, that rounds it with 32kbps AAC audio) and it looks highly fine! No squares. o.ovI should try 268 then, I currently use 316kbps + 32kbps audio. thanks!

[carlo_0000]

i make my first video with megui, the output is prety good but need to optimise the codec

i tryed 2 pass slowest but it was very faster than virtualdub

than i m going to use 3 pass, i prefere quality to enconding time


but i miss something can't cut the video ?
when i record from dvb i need to cut begin end end of the video

[Sharktooth]

3 passes is only useful if codec doesnt hit the desired bitrate.

[carlo_0000]

i have a probleme

some of my mpeg wouldn't start, i don't know why

http://perso.latribu.com/tribu//jpg/MeGui.JPG

[foxyshadis]

See that "Log" tab? It should tell you why. If not, try copying and pasting it into a post. Also ensure that you have the latest dgindex.

[carlo_0000]

it say nothing about an error

but i found a solution

i open the mpeg's or vob with TMPGEncDVDAuthor end remake a vob

than open it end it works

exepted that this gui works very good :D