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a DVD does not handle 1080, max 720x480/576 depending on NTSC/PAL
a DVD can handle max 4.7 gb
but: a good authoring program re-encodes the file in size and maximum quality to fit exactly on one DVD
edit: the file is also re-encoded into MPEG2 since that is the native codec for DVDs - at a bitrate of max 8000 kbit/s
and therefore inferior in quality by nature
edit 2: you need to burn a blu ray if you want to keep the quality
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