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.
So setting volume levels should become a card-specific setting in
MythTV.
Regarding the change in volume levels: the driver doesn't change them,
this too seems to be in the application.
Hans
On Thursday 12 January 2006 11:02, [EMAIL PROTECTED] wrote:
> I just noticed a peculiar situation:
>
> Running 18.1. MBE has several 250's with ivtv 0.4.1-r1. SBE/FE has
> 1 350 with ivtv 0.4.0. LiveTV uses the 350 because I have "avoid
> conflicts" checked and the 350 is in the FE. Cable feed is split
> across all of them into their RF inputs. Everything is getting
> played back through the 350's AV output, and the 350's audio out
> is looped through my sound card and then to the TV.
>
> If I leave all the sliders in the recording profiles for Default/
> LiveTV/High/Low quality at 90% (the default), and then start
> recording on all tuners on various channels, whatever the 350 is
> recording has MUCH louder audio (6-9db, as measured by my trusty dB
> meter) than the 250's. If I have the Master and PCM sliders in
> general setup set to 90%, then on my equipment, this happens to mean
> that anything on the 250's plays back somewhat quieter than direct to
> the TV (I can dual-screen the TV and flip back and forth between
> direct from the cable feed or through the Myth box), while the 350
> plays back somewhat louder. If I raise the Master & PCM sliders to
> 100%, then the 250's essentially play back at the level of the
> direct-to-TV path, but then the 350 is playing back MUCH louder.
> (When I say "playing back", of course, I mean "when I play back a
> stream that was captured by that card.")
>
> This is true for the 350 regardless of whether I'm using it in LiveTV
> mode, or it's capturing just like the rest of the tuners for a
> scheduled recording.
>
> I can't just lower the slider for LiveTV and leave it at that,
> because I'd like shows recorded by the 350 to have the same
> approximate volume as those recorded by the 250's. Yet I can't seem
> to find any independent volume control per-tuner, and I don't
> understand why this one card would be capturing as such a high level
> anyway. (And if I raise all the sliders in the recording profiles to
> 100%, the 250's still give me reasonable audio---just somewhat
> louder, of course---while the 350's audio is so hot that it's clipped
> and objectionable.)
>
> Is this a well-known effect? Is it peculiar to 350's vs 250's, or
> between ivtv 0.4.0 and 0.4.1-r1? Is there some register I should be
> setting on the 350 or something? I -could- try installing 0.4.1-x or
> even 0.5.x on the 350, but I'd rather leave well enough alone unless
> it's likely that this will fix it, since I had problems a while back
> with sporadically vanishing audio on ch2 and would rather not disturb
> the situation and possibly wind up back there.
>
> [Btw, ivtvctl -Y reports "volume = 58950" for both the 350 and the
> 250's. By trial and error (switching between LiveTV's output and the
> TV's direct input from cable), I find that "ivtvctl -y volume=54000"
> on the 350 normalizes its audio level to that of the TV; I'll have to
> play around a little more to make sure that also means it's
> normalized to the 250's. But why should I have to adjust this down
> so much? (And it won't stick! Changing channels or leaving LiveTV is
> fine, but reentering LiveTV bashes the register back to 58950! Is
> there any way to make this stick, as a workaround?)]
>
> Thanks for any insights.
>
> (Unfortunately, swapping the 350 into the other machine just to test
> ivtv versions w/o reinstalling anything would probably be a fairly
> large pain, given that I'd have to schedule up some recordings in
> advance, let it go, and then swap back to see how they went---and
> because the machines are both headless unless you count the 350.
> So I'd rather not swap hardware if there's another way to debug.)
>
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