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Re: ENCODING: Chroma/GOP/Pixel Aspect Ratio

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Ivan Myles
Re: ENCODING: Chroma/GOP/Pixel Aspect Ratio
on Oct 17, 2014 at 5:49:22 am
Last Edited By Ivan Myles on Oct 17, 2014 at 5:54:58 am

Sorry, I made a mistake in the previous post. Been a while since I used MPEG2. I will edit the post shortly.

M = Number of B frames between I/P frames. For IBBP, M=3 produces a P or I-frame every third frame. The minimum is M=1, which corresponds to zero B-frames.

N = Number of frames between I frames. N=4 produces IBBPIBBPIBBP... Setting N=15 produces IBBPBBPBBPBBPBP as a group of pictures. Your spec doesn't state GOP length. Admittedly, 4 is pretty short, and a number about half the frame rate is more common. Setting N=15 instead of a multiple of 4 (such as N=16) just changes the last frames in the group from BBP (16) to BP (15).

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