Building a Linux PVR Part I - MythTV Setup and Installby Kristopher Kubicki on September 3, 2004 12:05 AM EST
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IvyTV (continued)Supposedly, our tuner card is working correctly. We can quickly check to see if everything went OK by using the utilities included with the ivtv drivers and also by checking the /var/log/messages log. Our log reveals something like this:
Sep 2 13:31:36 linux kernel: ivtv: Found an iTVC16 based chip
Sep 2 13:31:36 linux kernel: i2c-algo-bit.o: (0) scl=1, sda=1
Sep 2 13:31:36 linux kernel: i2c-algo-bit.o: (1) scl=1, sda=0
Sep 2 13:31:36 linux kernel: i2c-algo-bit.o: (2) scl=1, sda=1
Sep 2 13:31:36 linux kernel: i2c-algo-bit.o: (3) scl=0, sda=1
Sep 2 13:31:36 linux kernel: i2c-algo-bit.o: (4) scl=1, sda=1
Sep 2 13:31:36 linux kernel: i2c-algo-bit.o: ivtv i2c driver #0 passed test.
Sep 2 13:31:36 linux kernel: tuner: chip found at addr 0xc2 i2c-bus ivtv i2c driver #0
Sep 2 13:31:36 linux kernel: tuner: type set to 2 (Philips NTSC (FI1236,FM1236 and compatibles)) by insmod option
Sep 2 13:31:36 linux kernel: msp34xx: init: chip=MSP3448W-A2 +nicam +simple +radio
Sep 2 13:31:36 linux kernel: msp3410: daemon started
Sep 2 13:31:36 linux kernel: saa7114.c: starting probe for adapter ivtv i2c driver #0 (0x10005)
Sep 2 13:31:36 linux kernel: saa7114.c: detecting saa7114 client on address 0x42
dmesg also reports success:
# dmesg | tail
ivtv: No mem on buf alloc!
ivtv: Buffer alloc failed!
ivtv: Registered v4l2 device, minor 0
ivtv: Registered v4l2 device, minor 32
ivtv: Registered v4l2 device, minor 224
ivtv: Registered v4l2 device, minor 24
Linux finally sees a v4l2 (video 4 linux) device. Note: YAST will not see the card. In order to run the utility packages from ivtv, particularly the tuner script, we needed to install perl and a few dependencies. All of these dependencies can be handled by YAST with the exception of:
perl-Video-ivtv-0.12-1.noarch.rpm (right click to download)
perl-Video-Frequencies-0.03-1.noarch.rpm (right click to download)
We pulled both of these RPMs off ATRPMs.net, but we have included them in the review in case you have difficulty locating them. The ptune-ui.pl utility allows us to change the channels easily for testing our PVR card.
Using the quick and dirty method to capture video, we pulled a few seconds of broadcast to test how well our device was working.
# cat /dev/video0 > /tmp/test.mpg
If we play this test.mpg back with Kaffeine (or some other player), we will get an mpeg2 stream. So far, so good. We used MPlayer to pull a single frame out of the stream, which can be seen below:
# mplayer -frames 1 -vo jpeg outdir=/tmp:quality=100 test.mpg
Keen observers will note that this image is non-interlaced - something that we will discuss later in our analysis.
Just getting SuSE install and ivtv to play nicely took two hours; our total time for installation right now is at 2.25 hours. Opting for a different distribution that supports the PVR card natively would have been a better idea, but we have already gone this far...