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it's up to the DVD player to make things correct then.
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Yes thats a real point. I did test some outputs on 4 diff. SAP Brand models and all do treat 720 sources as 53.333µs @13.5Mhz. They all did follow the ITU. Means in my case of PAL the PAR equals to
14.769Mhz (PAL TV)
–––––––––––––––––– = PAR 1.09402:1
13.500Mhz (SAP/ITU)
Two of the testet SAPs where mpeg4 supporting ones and so these ones also got an option for "generic" mpeg2 playback. In that case 720 was treaten by generic PAR.
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i think so long as circles look round and squares aren't rectangles, it's all fine.
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Keep in mind that just "circles" aren't the way of proof as circles will get a perspective distortion depending on the Camera view. Only "Bowl" Objects wont suffer from that as they are 3D round. Thats why I mentioned the example of "Planets" above. Do check those ones within the actual Movie and not in the Movie-Companies intro.
Once I checked a Stream by exermining it's "Working Title" Intro. It was wrong but the main movie itself was correct.