Cropping or downsizing from 720x576 to 720x540?
I want to go from 720x576 to 720x540. Because the horizontal resolution is already there, I won't touch that (apart from masking and recentering, but no resizing). However, because there are 554 "meaningful pixels" vertically, I need to either resize or crop some of the usable image away. What would the DigitalFaq overlords advice in this case? In case resizing is better, how exactly should I go about that?
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I'm not sure if that's a legal resolution, You can crop down to 704x576 and mask the remaining junk, That's the lowest legal resolution you can go down too, From there set the aspect ratio flag to 12/11 non square pixel to get a perfect 4:3 frame.
Check this thread: http://www.digitalfaq.com/forum/vide...mp4-frame.html |
It's "legal" for non-standards like streaming. ("legal" because there are no legalities/standards to a non-format)
Streaming is often a non-format, and 720x540 is a 1:1 pixel 4x3. But we all know that, mostly replying for the sake of other/future readers of this thread. |
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If you wish a PAR=1 I would not touch the heigth (that is the base for all PAR, DAR, SAR, etc.. calculation) but the width.
In addition, you experimented yourself that if you touch the height is not easy to understand when you have to crop, to resize or whatever. If (wished) PAR=1, DAR=4/3 and height=576 then width=768 (SAR=4/3). Hence resize to 768x576. Some useful information: http://www.arachnotron.nl/videocap/d..._cap_v1_en.pdf https://web.archive.org/web/20140816...eo/conversion/ |
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In the subject of square and non square, Here is a nice read for one of VH members from 2011: Quote:
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Maybe EmielBoss refers to files where AR is not set (i.e. HuffYUV avi), and you do not tell the DAR to the player (i.e. leaving "Video" ~> "Aspect Ratio" ~> "Default" in VLC) |
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On the references I mentioned the difference between 704x and 720x is clearly explained :wink2: |
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But you got me convinced to just use a 12/11 PAR! :) |
:)
Don't blindly follow any suggestion, but experiment yourself. If you have a doubt, try a resize and compare to a 720x540, moving frame by frame, zoom 400% in small details area, compare high motion transitions and judge yourself. Watch your (important archive) files with different players changing their settings, and different media and verify you are satisfied. On the other hand, is always better to stick to the standards :wink2: |
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