[mythtv-users] bitrate questions
lists at forevermore.net
Mon Aug 16 20:00:42 EDT 2004
> You use 2G+ per 40 minutes? wow... but that doesn't exactly correlate to
> your 2800Kbps setting, does it?
Guess I had that wrong. It's 1.8G per 1 hour and 6 minutes (pre/post
extra).. The 1.5G 36-minute shows were actually encoded at 3000kbps.
> I don't know what 3:2 pulldown is. Is that the same or similar to two-pass
> encoding ? Is this what prevents realtime encoding to make these smaller
> files ?
3:2 pulldown (somehow related to, if not the same as, inverse telecine)
is a way to trim out frames (thus losing quality by having a lower
framerate) to make bandwidth room for better-quality frames. So you end
up with a lower framerate, but higher quality frames. The "pulldown" is
then reversed on playback so that it *appears* to be full framerate. It
makes a huge difference when encoding svcd (since you usually just toss
out the interlaced frames, too) if you don't mind losing a little framerate.
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