Avi Projection images 2004-07-21 - By Anthony Ware
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Richard,
Not quite, you can extract frames from an MPG stream, but it's a pain. In
much simplified terms, MPG works by storing a complete frame, then a series
of changes that represent how to make subsequent frames starting with the
complete frame.
MPG is quite user configurable as to how often the complete frames occur and
so on. Say they occurred every 15 frames and you wanted to know what the
23rd frame was, then you'd need to go to the second complete frame in the
stream at frame 15, then calculate the next 8 frames to find out what frame
23 looked like. If it was the wrong frame and you wanted frame 22, you'd
have to find the second complete frame at frame 15 again, then calculate the
next 7 frames to get frame 22 and so on. MPG is ideally suited to watching
final video but is awkward to edit with, though it can be done.
(and for those who are more familiar with MPG streams, yes, I know all about
GOP structures and I, P & B frames, I'm just trying to simplify the
explanation!)
Anthony
> -- --Original Message-- --
> From: TSML [mailto:truespace@(protected)] On Behalf Of Richard R.
> "Remnar"
> Sent: 21 July 2004 13:54
> To: truespace@(protected)
> Subject: Re: [TSML] Avi Projection images
>
> With the mpg extension, I read that its not possible to extract
> frames. Is this true? If so then it explaines why caligari didnt add
> the capability. If its not true, then why doesnt Caligari support this
> file type? It is very common everywhere and it runs with very little
> cpu power.
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