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Advice Required, Cropping etc.
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hairykiore
Posted: Aug 12 2011, 04:26 AM


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Hi....I have done all my captures in avi (uncompressed)...so I am wanting to use Virtual dub to do a final edit_cropping on my files...I am reasonably familiar with using the basics but I have a couple of questions which I would be extremely grateful for advice on....If I crop out (eg bottom tracking lines) do I have to do a resize and if so what rules are there for getting the right aspect ......then I presume I can frameserver onwards to a program that will produce the files required for a DVD .....What program should I get for this...
or
Am I going about this the wrong way...Thanks HK..
 
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-vdub-
Posted: Aug 12 2011, 07:31 AM


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Download from here VirtualdubMOD with Aud-X(MP3 5.1 Audio) built in Next extract VDMod_Resize filter from the plugins32 folder and place in you virtualdub plugins32 folder, then start virtualdub. This resize filter will help it will show you when ar is correct, for the video resolution.

Video > Filters > Null Transform > Cropping

VDMod_Resize

Output Aspect Ratio: 1.777777777777778:1 = 16:9 ar
Ratio Error: +0:000% (zero no error perfect ar for chosen pixel size resolution)

Output Aspect Ratio: 1.333333333333333:1 = 4:3 ar
Ratio Error: +0:000% (zero no error perfect ar for chosen pixel size resolution)

Virtualdub > Options > External Encoders use external encoders to encode, can read more here .. Encode With External Encoders (A quick how-to on the feature)
 
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hairykiore
Posted: Aug 14 2011, 03:15 AM


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Thankyou ..For your reply... Hk
 
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erudub
Posted: Aug 25 2011, 05:07 AM


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An error of up to 2% is usually said to be tolerable. More gets ugly.

I use GordianKnot to calculate my resizing values (it has a screen, where you can enter aspect ratios and then select the values in 8- or 16-pixel intervals, as needed by codecs).

Greetings,
E.
 
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-vdub-
Posted: Aug 26 2011, 09:11 AM


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With VDMod_Resize filter can be used to process within virtualdub smile.gif




So gordianknot has also abilty to do same as VDMod_Resize filter for virtualdub (thanks for info).
 
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Loadus
Posted: Aug 28 2011, 06:11 PM


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QUOTE (hairykiore @ Aug 11 2011, 10:26 PM)
... If I crop out (eg bottom tracking lines) do I have to do a resize and if so what rules are there for getting the right aspect ...

If you captured your material at full resolution (720x480 for NTSC of 720x576 for PAL), and you just want to save it to DVD, don't use crop, but apply fill. That way you get to keep the original aspect and you don't have to worry about it.

http://www.loadusfx.net/virtualdub/fill.jpg

--------------------
deviantART behance
 
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