Yes, because you assigned a wrong PAR! HD video is always with square pixels, so there is nothing special here to observe. You realyl busted it up by overthinking it and then drawing the wrong conclusions...
Is that your answer? Cant you help me by telling me what to do?
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Your computer has square pixels. Standard television formats have non-square pixels.
You need to set up your composition with non-square pixels with a pixel aspect ratio that matches that of your output device. See this page for information about pixel asect ratios.
Thank you. I figured it had something to do with square/non squa
re but I dont get how I translate the info that stands on a page like the one you linked to.
If I have a project that has 1280 x 720 in size, what should be the correct setting if I want it
to be shown on a TV with square pixels?
Is this something I can do outside AE or do I have to import the video (.MOV) to AE and change the composition there?
Is that your answer?
Yes it is. I told you what was wrong and that by all means should have motivated you to investigate the issue. If it hasn't, well, then that's disappointing and makes me cringe, but well...