Date: Thu, 12 Jan 2006 19:11:33 +0100
From: Hans Verkuil <[EMAIL PROTECTED]>
In general it is next to impossible to make any assumptions on the
volume level captured by a card: it depends on the make, model, chips
used, tuner used, signal quality, etc. I have two pvr350 cards, one an
old model, the other new and they have totally different recording
levels.
Good to know. (And, dag-nab-it, modern electronics doesn't have
trimpots one can adjust with a jeweler's screwdriver... :)
I'll put a warning about this somewhere in the ivtvdriver wiki,
if I can figure out where would be an appropriate place.
So setting volume levels should become a card-specific setting in
MythTV.
I'll suggest it if it isn't already in the development version.
(It's certainly not in the stable release.) Not to mention that people
who have entirely different brands of cards mixed together -really-
shouldn't be expected to have them all have similar levels without
the ability to individually adjust 'em...
Regarding the change in volume levels: the driver doesn't change them,
this too seems to be in the application.
I figured. Unless I can easily find a hook to override, I'll just
hold my nose and do the once-a-second whack-a-mole to the register,
at least until a real per-card interface gets implemented such that
the app doesn't keep trying to reset all cards to the same level.
I assume that as long as I don't cause any sort of artifacts, the
card doesn't care? (I presume it doesn't have anything like flash
that would care about a zillion overwrites; if it does, I can sample
& reset only when the value gets bashed.)
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