[mythtv-users] Question regarding PVR-150

Jarom McDonald jarom_mcdonald at byu.edu
Sat Sep 1 18:29:54 UTC 2007

Do you have a video4linux kernel module installed? I just had this same problem when moving to FC6, and reading around on various lists pointed to video4linux as the offender when MythTV and a 0.10x version of ivtv are installed. It isn't even needed at all for the PVR-150 (but is for those PVR-350 users who use the TV-out, so is often included with any PVR-x50/500 setup), so a quick:

yum remove video4linux-kmdl-`uname -r`

uninstalled it, then I rebooted and the chipmunking was completely gone. (If I understand correctly, video4linux was making myth set ivtv to record just a tad slow, so playback sounds a tad fast and was slightly jerky).

Jarom McDonald

-----Original Message-----
From: mythtv-users-bounces at mythtv.org on behalf of Ian Forde
Sent: Sat 9/1/2007 1:43 AM
To: Discussion about mythtv
Subject: [mythtv-users] Question regarding PVR-150

Over the last 2 weeks, I have migrated both of my mythbackends from FC5
(x86-64) to Centos-5 (x86-64), patched them, upped my svn trunk revision
on them, and did the DD->SD conversion successfully.  So now I'm just
ironing out the bugs...

While I've gotten most of them, one in particular is really annoying.
I'm getting the following error in my backend log:

2007-08-25 21:00:03.495 MPEGRec(/dev/video0) Warning: Audio sample rate
32000 Hz
                        is not supported by ivtv driver, using 48000 Hz

And recordings coming from the card are getting "chipmunked".  It's not
too hard to figure out why... So taking a cue from the list archives, I
edited the db settings to make it say 48000 instead of 32000.  That
stopped the error, but not the chipmunking.  (I know that I should
probably ask this on the ivtv list, but since its myth giving the error,
I figured I'd ask here first...)

Any thoughts?  This wasn't happening on FC5...

Distro is Centos-5 x86-64 with kernel 2.6.18-8.1.8.el5

ivtv version is from atrpms, version 0.10.5-130.el5
        firmware 20070217-13.at from atrpms
ivtv kernel driver is ivtv-kmdl-2.6.18-8.1.8.el5-0.10.5-130.el5

mythfrontend --version yields:
[root at coruscant ~]# mythfrontend --version
Library API version     : 0.21.20070820-1
Source code version     : 14372
SVN Branch              : trunk
Network Protocol Version: 35
Options compiled in:
 linux release using_oss using_alsa using_backend using_dbox2 using_dvb
using_frontend using_hdhomerun using_iptv using_ivtv using_joystick_menu
using_lirc using_v4l using_x11 using_xrandr using_xv using_xvmcw
using_bindings_perl using_live

relevant modprobe.conf section:
alias char-major-81 ivtv
alias char-major-81-0 ivtv
#alias char-major-81-1 ivtv
#options ivtv ivtv_debug=0
options ivtv enc_mpg_buffers=16

Any ideas?


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