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ENCODING: Chroma/GOP/Pixel Aspect Ratio

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Ben Komins
ENCODING: Chroma/GOP/Pixel Aspect Ratio
on Oct 17, 2014 at 12:45:18 am

URGENT:

Hi:
Can someone please point me in the right direction within Adobe Media Encoder for the following specs:

GOP: Closed Long GOP (IBBP)
Pixel Aspect Ratio: 9:10
Chroma: 4:2:2 (HP@HL)


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Ivan Myles
Re: ENCODING: Chroma/GOP/Pixel Aspect Ratio
on Oct 17, 2014 at 5:04:35 am
Last Edited By Ivan Myles on Oct 17, 2014 at 5:51:32 am

MPEG2 codec with GOP settings:
M frames: 3
N frames: 4 for IBBPIBBPIBBP...
Closed GOP every: 4 (or possibly a multiple of 4)

The other settings are marked accordingly.


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Ben Komins
Re: ENCODING: Chroma/GOP/Pixel Aspect Ratio
on Oct 17, 2014 at 5:06:06 am

Thanks Ivan -
Just so I understand it a better - can you point to a resource that explains what you just wrote with details?


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Ivan Myles
Re: ENCODING: Chroma/GOP/Pixel Aspect Ratio
on Oct 17, 2014 at 5:12:34 am

Refer to "Video Export Settings"

http://help.adobe.com/en_US/mediaencoder/cs/using/adobemediaencoder_cs5_hel...


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Ben Komins
Re: ENCODING: Chroma/GOP/Pixel Aspect Ratio
on Oct 17, 2014 at 5:15:46 am

My apologies -
I read through that earlier - and just took a second look.

What I meant is how does your 2/4 Closed 4 recommendation = IBBP (as opposed to just leaving it at the default 3/15 Automatic GOP placement?


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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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Ben Komins
Re: ENCODING: Chroma/GOP/Pixel Aspect Ratio
on Oct 17, 2014 at 5:51:49 am

Copy that. That makes more sense. Many thanks.


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