[pvrusb2] audio pops and cracks in the recordings

[devsk]

> Actually, it would be more useful if you just cat'ed the unchanged mpeg 

ok, I cat'ed the /dev/video0 for a while and then using only 'cat' and 'split' got this sample which is small enough for upload and download:

http://home.comcast.net/~funtoos/sample.mpg

Please have a look/listen and let me know which setting can I tune to get rid of these pops.

And you were right about dmesg. everything is clean in the status information.

-devsk

----- Original Message ----
From: Mike Isely <isely at isely.net>
To: Communications nexus for pvrusb2 driver <pvrusb2 at isely.net>
Sent: Sunday, January 21, 2007 7:53:51 PM
Subject: Re: [pvrusb2] audio pops and cracks in the recordings

On Sun, 21 Jan 2007, devsk wrote:

> I have put out a sample that I collected with 'mplayer /dev/video0 -dumpaudio' and chopped into to .wav with  mpg123 -n 180 at

Actually, it would be more useful if you just cat'ed the unchanged mpeg 
data to a file and make that available.  Then we can figure out if the 
pops are coming directly from the hardware or if it is an mplayer issue.


> 
> http://home.comcast.net/~funtoos/sample.wav
> 
> Also, I want to take the HD 5.1 thingy back. The pops are not specific to HD material.

OK.  Not a surprise since HD material is simply not possible on an NTSC 
broadcast.

Relating to your previous post, the pvrusb2 driver causes the I2C 
chip-level driver modules to dump their status early on when they attach 
to the pvrusb2 driver.  Since you haven't really tuned anything at that 
point, the results may not be very meaningful.  However if you do this:

cat /sys/class/pvrusb2/*/debuginfo

Not only will you get some info to the terminal, but all the I2C 
chip-level driver modules will be requested to dump their state again to 
the system log.  Have a look at dmesg again and see what it says about 
its tuning / decoding status.

  -Mike

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