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square pixel and 4:3
Hi everyone. I suppose most of you work with NTSC, but I think I would have the equivalent doubts with that format as I have with PAL.
This is the point: Isn’t PAL supposed to look 4:3 in it’s final square pixel look in computer?
I mean, when I capture, the video has a flattened 768×576 look because of the non square pixel I suppose, although it says it is 720×576. So, looking flat it is 4:3. Now, when I compress it for example with the Flash encoder, it gains the non flatenned square pixel look and becomes really 720×576. But 720×576 is not 4:3. So the only way of having 4:3 in the computer is having it flattened?
This drives me nuts.
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11 Replies
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I’m not sure what you mean by the term ‘flattened’ in this instance but:
720×576 is 4:3 non-square pixels
768×576 is 4:3 square pixels.All video encoded for computer playback should be square pixel as computer uses square pixels. Therefore, you would take a 720×576 source and transcode to flash at 640×480, 384×288 or 192×144 etc (Ideally you want to have the dimensions equally divisible by 16)
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p.s. you might want to look at this:
https://kb.adobe.com/selfservice/viewContent.do?externalId=322300&sliceId=2
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Sorry, by flattened I meant that it looks fat. The point is, if I want to see the video in the computer at 4:3 (768×576) it looks fat. Instead to see it properly I have to see it at 720×576, which is not 4:3!
When capturing and watching what’s captured in any media player, it shows it 4:3 and flat. Later if I compress it with flash compressor, I can only do it at a ressolution equivalent to 720×576. The result is the image looks proportionally good, but not 4:3. The same with After Effects, when I say that I want to show it with square pixel, the image is no longer 4:3.
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I’m having a problem following you here, but how does the video look if you transcode it to 640×480 – which is 4:3
Perhaps you could explain the exact workflow you’ve used that produces 720×576 using square pixels (if that is what you believe is happening)
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Well, the point is I can’t transcode it to 640×480 without distorting it. When I write 640, it automatically writes 512. To change that I have to uncheck the “keep proportions”.
So, I capture the video with Premiere for example, but I tried also with the window movie maker to see what would happen… it happens the same.
I get a squeezed video that looks 768×576 when seeing it in the media player or quicktime for example. When I transform it to square pixel (converting it to a .flv file, or interpreting the footage in After Effects) I get a normal looking image, no longer squeezed, but that in fact is 720×576.
If you want I can e-mail you 3 seconds of a captured video for you to see if that’s normal or not.
My e-mail is paubcn@gmail.com
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What are you capturing? DV?
What hardware are you using? Firewire?
What settings are you using for capture?
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Yep, I’m capturing DV and I use Firewire. I use the standard 48hz DV for Pal available in Premiere (image size 720×576 (1,067); 25f/s; milions of colours…)
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Ok. Transcode to 640×480 (or another 4:3 frame aspect and uncheck “keep proportions”
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But as a result it squeezes the image… So I assume it is impossible to have square pixel PAL videos in 4:3 without squeezing or cutting.
Thanks for your time anyway
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As i said in my 1st reply, 4:3 PAL can be either:
720×576 NON-Square pixels
or
768×576 Square pixelsIf capturing PAL at 720×576 (non-square) and transcoding to 640×480 square pixels results in a distorted image then you have something wrong with some setting somewhere.
Are you sure you’re not capturing 16:9 footage?
__________________________________________________________________
Please post back saying what solved your problem. It could help others, and saying ‘thanks’ is free!
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