Re: [V4L] A question of bps for various capture types

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Hi

(--warning-- long and disjointed --warning--)

I've been doing quite a bit of (highly unscientific) experimentation on
this.

A big issue in quality comes down to playback. I have yet to find a
*decent* mpeg viewer for linux that will do fullscreen playback (yeah, I
know, mtv - but it's very choppy at fullscreen).
I've been using (Ugh!) Windows 98 for playback, I have yet to see a Linux
mpeg player that works *anywhere near* as well as windoz media player.
(*damn* it hurt saying that!)
I capture the mpegs at 384x288 (1/2 PAL) using mp1e w/ v4l2 and drop
windows into 640x480 for fullscreen playback.

A few observations:
1.	mp1e and v4l(1) - drops a few frames here and there, and is a little
choppy, audio syncs fine in stereo (-a0), but doesn't sync in mono (-a3).
2.	mp1e and v4l2 - great - no dropped frames, needs to be configured with
vidpanel, 'cause color is a bit funny otherwise, audio syncs OK in mono
(-a3) but not in stereo (-a0).

Low quality capture (default for mp1e is 2.3 Mbit IIRC) is acceptable, but
I would only use it for, say 'Opray' or quick snippets. Takes around 1 GB
per hour.

Fairly decent quality is around 3 - 3.2 Mbit, works quite well for movies &
action sequences, comes out around 1.3 - 1.4 GB per hour.

I haven't tried anything higher yet, maybe this weekend.
Playback on a TV would probably look a whole lot better than a small
monitor close-up.

btw. Hardware is an old IXMicro TurboTV, K6/2 500.

Hope this was of some help

Anton Coetzee







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