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ivtv on Fedora with 2.6.22 kernel


Upgrade to 2.6.22 seems to break everything in the ivtv suite. It all disappeared from the rpms, so we need to install from source.

  • ivtv

  • ivtv-fb

  • ivtv-xdriver

  • ivtvfbctl (now gone)

In particular, some web posts indicate that support for the PVR-350 has been eliminated somehow. This doesn't seem to be completely true - but maybe there's a problem with the hardware decoding from MythTV. By doing the following, the PVR-350 can be made to display X in framebuffer mode, and do the output via the framebuffer too...

If the hardware-based decoding (which can be overlaid on the X display) can be made to work then the Use PVR-350 output in MythTV can be enabled. Which also means that doing MythTV should result in very low processor load.

ivtv and ivtv-fb on Fedora 7 : 2.6.22

yum install kernel-devel kernel-headers

We don't need to build the ivtv stuff entirely from source : the ivtv driver has now been moved into the kernel. However, the ivtv-fb isn't in the kernel... So we need to compile that part afresh (the rest of ivtv is in the v4l-dvb / v4l tree, shown below).

This is the only part that needs to be done if you're upgrading between 2.6.22.xx versions.

/sbin/modprobe ivtv-fb # Should fail now
curl -O
tar -xzf ivtv-1.0.2.tar.gz
cd ivtv-1.0.2/
cp v4l-cx2341x-init.mpg /lib/firmware/
make clean
make install # To create the ivtv-fb module
/sbin/modprobe ivtv-fb # Should work now

To install the firmware (may not be necessary now)

yum install ivtv-firmware


cp ivtv-1.0.2/v4l-cx2341x-init.mpg /lib/firmware/

For the v4l stuff - actually, may be better for ivtvfb

Do this only if the old FC6 v4l stuff is installed, since the control commands are expecting a different version of ivtv to be answering on the other end.

This includes the control suite necessary to change alpha and input/output channels on the card - so it's important to have this in sync with the ivtv version.

Go to and then pick up the most recent tar from the link at the top of the page :

mkdir -p /root/MythTV/2.6.22-ivtv/
cd /root/MythTV/2.6.22-ivtv/
curl -O   # around 2.7Mb
tar -xzf tip.tar.gz
cd v4l-dvb-* # Adjust this directory name
make clean
make install

ivtv-fb (?) : Installing Firmware

Fedora 7 : The location where hotplug expects firmware to be loaded into (for example, firmware for Cardbus cards) has changed from /usr/lib/hotplug/firmware to /lib/firmware. Existing firmware files must be moved into the new directory.

Get the firmware from the main ivtv page :

References :

Fedora 7 xdriver

yum install video4linux
yum remove ivtv_xdriver  # This is the old fc6 version

Check whether it's there already :

ls -l /usr/lib/xorg/modules/drivers/ | grep ivtv

If there's no we need to build it :

curl -O
tar -xf trunk.tar.gz\?view\=tar
cd trunk
ls -l
chmod 755 configure
./configure --prefix=/usr/
make clean
make install

Setting up the modprobe configuration

Into /etc/modprobe.conf put :

# load ivtv-fb for PVR-350 output
alias char-major-81 videodev
alias char-major-81-0 ivtv
options ivtv-fb osd_compat=1
install ivtv /sbin/modprobe --ignore-install ivtv; /sbin/modprobe ivtv-fb

Checking it all works

# ll /dev/video*
lrwxrwxrwx  1 root    root      6 2007-06-13 09:18 /dev/video -> video0
crw-------+ 1 yoshika root 81,  0 2007-06-13 09:18 /dev/video0
crw-------+ 1 yoshika root 81, 16 2007-06-13 09:18 /dev/video16
crw-------+ 1 yoshika root 81, 24 2007-06-13 09:18 /dev/video24
crw-------+ 1 yoshika root 81, 32 2007-06-13 09:18 /dev/video32
crw-------+ 1 yoshika root 81, 48 2007-06-13 09:18 /dev/video48


/bin/dmesg |grep Initialized

ivtv0: Initialized Hauppauge WinTV PVR-350, card #0 [drm] Initialized drm 1.1.0 20060810 [drm] Initialized i915 1.6.0 20060119 on minor 0

This shows that the framebuffer is on /dev/fb0 :

cat /proc/fb

0 cx23415 TV out

And, just to confirm :

ls -l /dev/fb*

lrwxrwxrwx 1 root root 3 2007-06-13 09:18 /dev/fb -> fb0 crw------- 1 yoshika root 29, 0 2007-06-13 09:18 /dev/fb0

To find the BusId of the PVR-350 (for the /etc/X11/xorg.conf file) :

/sbin/lspci | grep "Internext Compression"

01:05.0 Multimedia video controller: Internext Compression Inc iTVC15 MPEG-2 Encoder (rev 01)

## Testing the Devices Work

Set up the Inputs and Outputs to Composite (the RCA connectors) :

v4l2-ctl -i 2

v4l2-ctl -o 2

Test the input connection :

cat /dev/video0 > /tmp/test_capture.mpg

mplayer /tmp/test_capture.mpg

**NEW IN 2.6.22 : ivtvfbctl no longer working - must use v4l2 to control alpha**

Set the framebuffer to be hidden :

OLD VERSION : ivtvfbctl --device=/dev/fb0 --globalalpha=on --localalpha=on -v 0

v4l2-ctl --set-fmt-output-overlay=global_alpha=0

Get the video signal to passthrough :

ivtvctl -K 1

This should show a passthrough video/audio signal.
(or, as a one-liner :
`# v4l2-ctl -i 2; v4l2-ctl -o 2; ``
# OLD VERSION : ivtvfbctl --device=/dev/fb0 --globalalpha=on --localalpha=on -v 0
# v4l2-ctl --set-fmt-output-overlay=global_alpha=0
ivtvctl -K 1


Set the framebuffer to be entirely in front of MPEG decoder :

# OLD VERSION : ivtvfbctl --device=/dev/fb0 --globalalpha=on --localalpha=on -v 255
# v4l2-ctl --set-fmt-output-overlay=global_alpha=255

Set the framebuffer to be dimly in front of MPEG decoder :

# OLD VERSION : ivtvfbctl --device=/dev/fb0 --globalalpha=on --localalpha=on -v 100
# v4l2-ctl --set-fmt-output-overlay=global_alpha=100

Test whether the encode/decode cycle works :

# ivtvctl -K 0
# dd if=/dev/video0 of=/dev/video16 bs=64k

This may come in handy later :

# v4l2-ctl -d /dev/video0 --set-fmt-video=width=720,height=480