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Which encoder keeps Pixel Aspect Ratio intact?
Forum Index -> Video -> DVD Ripping Printer-friendly version
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hadiceberg
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Joined: 25 Feb 2009
Location: Iran
Post Posted: Jun 07, 2009 03:40 Posts Comp View users profile Send private message Reply with quote
Hi
assume that I'm trying to backup one of DVDs which is a PAL film with AR of 16:9 (no black stripes)
the original dimensions of video are 720 by 576. but when I try converting it to Xvid/x264, the converters choose a pixel aspect ratio of 1:1, thus at the highest quality settings the video height will be 9/16*720=405, which is considerably lower than original and results in loss of vertical resolution.
I'm looking for a converter which respects PAR. I already tried AutoGK (for xvid) and Fairuse Wizard (for x264).

guns1inger
Member


Joined: 01 Apr 2004
Location: Miskatonic U
Post Posted: Jun 07, 2009 03:48 Posts Comp View users profile Send private message Reply with quote
Xvid4PSP will do it. So will AutoGK, but you will have to play with the hidden settings.

However, before you get too bent out of shape, think about what you are doing. DVD uses non-square pixels to achieve correct image shape on playback. This works because DVD players (hard and soft) understand and and expect Display Aspect Ratio flags to tell them how to display the video correctly. Many players (both hard and soft) do not do this for Divx/Xvid encoded avi files. They expect 1:1 PAR, and playback accordingly.

If you maintain the 720 width, converting to 1:1 PAR doesn't actually cost you anything in quality, and can increase the quality of you encodes because you have more bitrate to play with due to the lower number of pixel to encode.
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hadiceberg
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Joined: 25 Feb 2009
Location: Iran
Post Posted: Jun 07, 2009 04:05 Posts Comp View users profile Send private message Reply with quote
I don't agree with the part you said that I won't lose any quality. At playback time a 720x576 source will be resized to 1024x576 on my monitor (on 1024x768 resolution) which is only stretched in one direction. but when the source is 720x405, it will be stretched both horizontally and vertically. I really can feel the difference on my monitor. the first one has higher vertical resolution.

I can't find the option. this is a screenshot. can you tell me which one it is?


guns1inger
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Joined: 01 Apr 2004
Location: Miskatonic U
Post Posted: Jun 07, 2009 04:22 Posts Comp View users profile Send private message Reply with quote
ctrl+F9 will open the hidden settings menu, although looking at it now it may not solve your problem. Xvid4PSP will though. However personally I find playback on non 1:1 AVI files too hit and miss to be worth the trouble.
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manono
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Joined: 28 Aug 2003
Post Posted: Jun 07, 2009 06:26 Posts View users profile Send private message Reply with quote
There's a way to keep it 720x576 using AutoGK, but I'm not entirely sure what it is. You definitely want to check the "Tune Autocrop Parameters", set "Threshold" to 0, and "Cropping" to 0. What I can't remember is if under "Aspect" you also have to check the "Override Input AR" box and set it to "Original" or not. A small test should help you figure it out.

poisondeathray
Member


Joined: 07 Sep 2007
Location: Canada
Post Posted: Jun 07, 2009 09:36 Posts View users profile Send private message Reply with quote
If you were encoding using x264, you would enter --sar 65:45 for a PAL 16:9 uncropped DVD. I don't think fairuse wizard has this functionality (it is a limited GUI for x264, and there are better front ends).

jagabo
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Joined: 09 Dec 2005
Location: none
Post Posted: Jun 07, 2009 10:16 Posts Comp View users profile Send private message Reply with quote
MPEG4Modifier can set the Divx/Xvid AVI PAR/DAR after the fact.

hadiceberg
Member


Joined: 25 Feb 2009
Location: Iran
Post Posted: Jun 07, 2009 11:47 Posts Comp View users profile Send private message Reply with quote
It seems that it's not worth the struggle.
I will stick to 1:1 PAR.
thanks for all your help people smile.gif

mh2360
Long Member


Joined: 01 Aug 2001
Location: UK
Post Posted: Jun 07, 2009 16:04 Posts Comp View users profile Send private message Reply with quote
Handbrake does a fine DVD>MP4 conversion, and it has an option to keep the picture "anamorphic" (16:9 PAR).

I've been converting a few DVDs lately for use with W7 Media Center/Xbox 360 and the results are quite impressive.

hadiceberg
Member


Joined: 25 Feb 2009
Location: Iran
Post Posted: Jun 07, 2009 17:11 Posts Comp View users profile Send private message Reply with quote
I tried Handbrake. It performs impressive regarding PAR. thanks smile.gif
but it is considerably slower than fairuse wizard. what am I doing wrong here?

mh2360
Long Member


Joined: 01 Aug 2001
Location: UK
Post Posted: Jun 07, 2009 19:26 Posts Comp View users profile Send private message Reply with quote
It could just be that Handbrake's encoder settings are set to a higher quality than Fair Use Wizard, or it could be the encoding engine itself.

Ally68
Senior Member


Joined: 10 Jan 2001
Location: Region 1
Post Posted: Jun 08, 2009 07:09 Posts View users profile Send private message Reply with quote
Slower encoding is usually a good thing. Until the encoder can actually produce quality at high speeds.

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