On 26 Nov 2003, Florin Andrei wrote:
> So, since we're at "look at the preview release and say what you don't
> like" anyway :-) here's another documentation feature request:
Just a bit late for this one - the next release candidate is
RSN (Real Soon Now). Ronald's probably working it right now .
Maybe next one ;)
If you can't wait you can do a 'cvs update' - no more changes are
anticipated aside from coredumping show stoppers.
> mpeg2enc. Would it be too hard to document:
Well, yes, at least a little bit ;) There's the problem of implied
knowledge - after a certain point the mjpegtools documentation would
end up being a treatise on video compression and there are tons of
excellent books on that topic.
> - what are those steps (essentially, what happens in each one of them)
You mean it's not intuitively obvious that single coefficient
elimination would be done between the quantization and encoding? :-)
Oh - you can safely use "-N x.x" with "-H" now, that was something
I fixed. Previously the last one used would override the first.
And you can use "-N" with "-K" to further customize/tailor the
tables if desired.
> > You can, if you wish, create your own custom matrices and use them
> > with "-K file=path_to_your_file". Thus you can take the intra (I
>
> You'da man! I was looking for precisely the same thing: something to
(thankful) shrug - just doing my small part in the collective effort.
*WARNING*
The parser for the '-K file=' option is simplistic in the extreme -
don't put extra whitespace, extra commas, hard (DOS) newlines, and
so on in the file.
As a diagnostic/debug aid you can spell 'file=' as "FILE=" and
mpeg2enc will log to stderr the tables it read in so that you can
verify the correctness of the parsing.
> boost the quality of the full frames, while keeping the delta frames
> "good enough". But not so painfully pedantic as a full-blown hi-res
> (which, BTW, is a bandwidth pig).
Na, you want a bandwidth pig try "-g 1 -G 1" and generate only
I frames :) Encoding is very fast but the files end up being
60% larger than a GOP size of 15 using P frames.
But I thought you weren't on a bit budget... ;)
Cheers,
Steven Schultz
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