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Re: Problem with MJ2 extension [message #60653 is a reply to message #60536]

Wed, 28 May 2008 14:37

Mark[1]
Messages: 66
Registered: February 2008

Member

On May 28, 12:14 am, "Haje Korth" <haje.ko...@nospam.jhuapl.edu>
wrote:
> I agree that the MJ2 format is still poorly supported. But the fact that no
> inter-frame compression is used is THE advantage of the format. This way
> each image accurately represents the underlying scientific dataset and
> individual images are not smeared by the codec algorithm. It is accuracy
> that matters, not file size!

It depends on the purpose, obviously, and there are purposes for which
MJ2 is appropriate (or will be when it's more widely supported)
however those purposes generally don't match my needs.

However I would like to dispute your suggestion that inter-frame
compression necessarily degrades accuracy. In principle, animations
with inter-frame compression can store all the information required to
reconstruct any given frame, it's just that they spread it over
several frames.

For scenes with a limited number of colours, the old-style AVI codecs
like Microsoft RLE (8-bit) and Microsoft Video 1 (16-bit) work very
well. These use simple intra-frame compression plus simple inter-frame
compression. They are either lossless (RLE) or nearly so (Video 1) and
they achieve reasonably small file sizes and very fast playback.

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[Message index]

		Problem with MJ2 extension By: tarequeaziz on Fri, 23 May 2008 21:16
		Re: Problem with MJ2 extension By: Haje Korth on Thu, 29 May 2008 05:26
		Re: Problem with MJ2 extension By: Mark[1] on Wed, 28 May 2008 14:37
		Re: Problem with MJ2 extension By: manodeep@gmail.com on Wed, 28 May 2008 00:54
		Re: Problem with MJ2 extension By: tarequeaziz on Tue, 27 May 2008 15:02
		Re: Problem with MJ2 extension By: tarequeaziz on Tue, 27 May 2008 15:01

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