a.nielsen at optushome.com.au
Sat Jan 3 16:07:28 CET 2004
> Yes but the first (audio) pass is about 15 mn long for a 2 hours files.
> If you try your 2-pass method (more than 3 hours four a 2 hours files) 3
> times you save about 5h45 (3*3h -1*3h -0h45).
Oh yes, it certainly takes a long time this way, but I have plenty of time ;-)
I leave them going overnight so they've finished in the morning. It's not
the time I'm worried about so much, I just don't like the fact that basically
I have to guess the bitrate.
> What matroska has so special, and why do you use Vorbis ?
I use Vorbis because it's *much* better quality than MP3, it has a smaller
file size (so you can use a higher video bitrate) and of course it's open
source. For example, a Vorbis file averaging at 128kbps sounds identical to
a 320kbps MP3 (and it's less than half the size!)
Matroska is good because it's a lot more versatile than AVI, and because
Vorbis is variable bitrate it doesn't work quite as well with AVI. Matroska
is designed to hold MPEG-4 and Vorbis (as well as many other codecs) so the
MPEG-4+Vorbis combination works very nicely with it. The tools are also very
mature, so it's no trouble doing things like joining/splitting files,
adjusting A/V sync, etc. You can also include subtitles along with the audio
and video tracks, just like DVD subtitles.
Unless you have a compelling reason to stay with AVI, you should really look
at an alternative and Matroska is definitely worth trying.
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