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Hi, I need help with virtual dub options. Would appreciate your help/suggestions.
I'm using virtuadub and wanted to go from 700MB to say 350-420MB.
My input file:
Avi, Overall bit rate : 908 Kbps
Bit rate : 771 Kbps
Width : 640 pixels
Height : 352 pixels
Codec ID : XVID
Audio:mp3
My only option is xvid. I'm not sure which options should I choose like B-VOP, Chroma optimatizer. QPEL , Luminance-masking and VHQ mode.
Should I choose single pass or two pass ? I used single pass and had some significant noise. When I used smoother the image seemed to have lost some sharpness. Not really sure about the best settings.
Also when trying to encode cartoons should Cartoons mode be always ticked ?
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Just set the encoder to defaults, that's a good place to start, and may be good enough.
Two pass better when bitrate gets low. -
what's the best way to deal with noise apart from having a bigger file size ?
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So to get half the size use half the bitrate, two pass encoding. The default settings (except changing to two pas bitrate mode) will get you 95 percent of the quality you'll ever be able to get out of Xvid.Code:
file size = bitrate * running_time
What do you mean your only option is Xvid? You have a device that requires Xvid? Or you just don't see any other choices? If the latter, installing and using x264vfw will allow you to encode with half the bitrate without losing much quality.Last edited by jagabo; 23rd Feb 2015 at 17:24.
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How to find Average bitrate? it's not overall bitrate is it or is it ? Sorry for this newbie question.
I usually experimented with unrestricted profile. 420MB is still full of noise.
I got older dvd player that can read only xvid/divx. Had some issues in the past with my dvd playear being unable to read x264.
As far as the profile goes which one would be here the best MPEG4 AS @L5 or MPEG4 ASP @L5 ?Last edited by Editall; 23rd Feb 2015 at 17:31.
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average = overall.Originally Posted by Editall
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Thanks man, what about these profiles as far as xvid goes MPEG4 AS @L5 or MPEG4 ASP @L5 ? I guess I shouldn't bother with xvid Home and such.Originally Posted by jagabo
average = overall.Originally Posted by Editall
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Why would you possibly want to do that?Originally Posted by Editall
The bitrate is already low and XVID is as far as I am concerned a lousy CODEC.
So why degrade the quality even more?
I'd say do not mess with it at all, the quality is probably already lousy and any ventures into recoding will make things even worse. -
The presets limit bitrate peaks and some of the settings for device that don't support all Xvid features. You can see the limitations by pressing the "more" button next to the profile pulldown. The default Home profile is probably sufficient for you. Most Divx/Xvid DVD players support that. Do not use GMC or QPEL.
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spatial blur + temporal blur (as VDub is a video editor/processor)
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I got some files I want to get rid off, well sort offOriginally Posted by newpball
(things I rarely watch) and don't want to have the whole shelf occupied by DVDs lol. Hence the file reduction.
The quality is not THAT bad but of course it could be a lot better no doubt about it.
I've noticed that half the overall bitrate gives really acceptable results (460MB, single pass). Really hard to notice the difference that much. Will try two pass and see if I will be able to make it 360MB with equally good results. I'm a bit skeptic though.Last edited by Editall; 24th Feb 2015 at 04:01.
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One thing to keep in mind: Xvid on the PC has deblocking and deringing options. But Divx/Xvid DVD players usually do not. Playback on the PC with those options enabled will look better than on your DVD player.
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You could give AutoGK a spin. It's designed for DVD re-encoding but it'll also open AVIs. You'll need to have an appropriate DirectShow decoder installed. Something like ffdshow would be fine. If you leave AutoGK in auto mode and select just an output file size it'll run a compression test and make adjustments to resolution and Xvid settings as required to output the best quality it can.
If you give AutoGK a try, selecting the "ESS" hardware compatibility option when you install it should ensure 100% compatibility with AVI capable DVD players. If you already have Xvid "installed" it'd probably be an idea to uninstall it first and let AutoGK install it's version of Xvid. That's because AutoGK makes adjustments to various Xvid settings and if you have a different version installed it mightn't be able to configure Xvid correctly.
Mostly you should be able to load a file, pick an output file size and let AutoGK do it's thing, but Ctrl+F9 should take you to the "hidden" options.
http://www.afterdawn.com/guides/archive/dvd_to_avi_using_autogk_page_2.cfm -
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Use 2 pass VBR. That allows the codec to allocate more bitrate to scenes that need it, less to scenes that don't.
AutoGK uses the same Xvid codec. But it's simpler to use. You just set the size you want and it adjusts else everything for you. If it thinks the video won't turn out decent it will reduce the frame size (smaller frames require less bitrate). Of course, that's trading resolution for fewer blocky artifacts.
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