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pvr-350/ivtv audio record level low after upgraded to R5B7
http://forum.linhes.org/viewtopic.php?f=6&t=9957		 Page 1 of 1
Author:  grante [ Sun May 07, 2006 10:16 am ]
Post subject:  pvr-350/ivtv audio record level low after upgraded to R5B7
After upgrading to R5B7, I noticed that the recorded audio level is a lot lower than pre-upgrade. I've confirmed that it's the record level that's lower and not the playback level that changed.

Where is the audio record level set for ivtv?

Did the default value change?
Author:  tjc [ Sun May 07, 2006 10:30 am ]
Post subject: 
If memory serves the setting you need is in the recording profiles. This is a known change with the ivtv drivers, there was actually a fair amount of discussion about it back when the 0.4.x versions of the ivtv drivers came out and again when R5B7 was released using them. http://dl.ivtvdriver.org/ivtv/stable/ChangeLog Hmm... Looks like there's a new patch release of the driver. It might be worth trying an upgrade to see if it helps. Directions here: http://www.knoppmythwiki.org/index.php?page=CompileIvtv just substitute 4.5 for all 4.4 (if I haven't already fixed the page.)
Author:  grante [ Sun May 07, 2006 11:02 am ]
Post subject: 
My bad. On my old system, I had added a line to /etc/init.d/set_ivtv_params:

$IVTVCTL -d /dev/video$f -y volume=64000

I had always thought that this was changing the playback volume, but it appears that it's changing the record volume (which wasn't what I had intended).

From looking that the ivtvctl help there doesn't appear to be any way to adjust the PVR-350 playback volume. Rats. :/

I guess I should toss the passive mixer I'm using to combine soundcard and PVR-350 audio before it goes to the amp and figure out a way to combine the outputs that doesn't attenuate the signal from the PVR-350.

Or, I supposed I could hack up my motherboard so I can run the PVR-350 audio through the soundcard.
Author:  grante [ Sun May 07, 2006 12:01 pm ]
Post subject: 
grante wrote:
My bad. On my old system, I had added a line to /etc/init.d/set_ivtv_params:
I guess I should toss the passive mixer I'm using to combine soundcard and PVR-350 audio before it goes to the amp and figure out a way to combine the outputs that doesn't attenuate the signal from the PVR-350.

Or, I supposed I could hack up my motherboard so I can run the PVR-350 audio through the soundcard.


After several years of various sub-par audio configurations (350 output and soundcard output into two different amp intputs; 350 output and soundcard output mixed together with a passive mixer Y cable), I'm going to break down and do it the "right" way: run the PVR-350 output through the soundcard. I found a right-angle 1/8 stereo jack adapter at the RS website that should allow me to route audio into my soundcard line-in (which is unfortunately on the front of the box) and still have enough clearance to close the doors on the TV stand.
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