MythTV Hardware- Hauppauge USB Live-2

The Hauppauge USB Live-2 is a USB 2.0 capture device without a TV tuner. It has both composite and S-video inputs. It also has stereo audio inputs. It has never been fully supported in Linux, however, new kernels have some degree of support. The chipset in the device has been revised at least twice. Success with the device may depend on which encoder chip is present.

driver and system recognition

The driver will be loaded by the kernel during boot. When the system is up, use the command lsusb to see the device.

Example:

# lsusb
Bus 002 Device 002: ID 174c:3074 ASMedia Technology Inc. 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 09da:0006 A4 Tech Co., Ltd Optical Mouse WOP-35 / Trust 450L Optical Mouse
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 005: ID 2040:c200 Hauppauge 
Bus 001 Device 002: ID 174c:2074 ASMedia Technology Inc. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Here the device can be seen as Device 005 with the label "Hauppauge."

You will have better luck connecting this device to a USB 2.0 port than a USB 3.0 port. There is a bug in the linux kernel known as the "USB Shutdown Bug" which impacts machines that have both USB 2.0 and USB 3.0 ports. It is recommended that you disable support for USB 3.0 in the system BIOS.

If you are specifically impacted by the "USB Shutdown Bug" you will notice errors in "dmesg" such as:

xhci_hcd ERROR Transfer event TRB DMA ptr not part of current TD

You may observe no video, green video, or flickering partial video in your video player. USB ports may become inactive. If you have a USB mouse connected to the system you may lose use of the mouse as the USB ports will become non-functional until reboot. Again, disabling SuperSpeed or USB 3.0 in BIOS will often serve as a workaround.

testing video input

Once in Xfce you can test to see if you are able to receive video from a composite source via the USB Live-2. For basic testing purposes mplayer serves well. You will want to make sure that the driver loaded by using lsusb as described earlier. A device should have been created in /dev as /dev/video0 or if you have other capture cards it could be /dev/video1 or higher. Confirm which video device belongs to your USB Live 2. For our example we will assume /dev/video0

From the command prompt in a console window type the following:

mplayer tv:// -tv driver=v4l2:device=/dev/video0:norm=NTSC:width=720

mplayer will complain that there is no TV Tuner (because of the -tv switch) however this will not prevent video from being displayed. Specifying width= can be substituted with a width you prefer based on your resolution. You should now see video from your source.

Please note that the indicator lights on the USB Live 2 device will not illuminate nor will they blink during testing.

The driver dev made it default to PAL. This is annoying if you are in North America. norm=NTSC will force it to NTSC however if you observe dmesg you will see it tries PAL then NTSC.

cx231xx #0: do_mode_ctrl_overrides : 0xff
cx231xx #0: do_mode_ctrl_overrides PAL
cx231xx #0: do_mode_ctrl_overrides : 0xb000
cx231xx #0: do_mode_ctrl_overrides NTSC

I guess if the dev lives in Europe he is going to assume everyone uses PAL.

testing audio input

Install PulseAudio Volume Control.

apt-get install pavucontrol

PulseAudio Volume Control will show at least 2 devices under the "Configuration" tab. The first device will be your sound card or built-in audio. The second device will be for the USB Live-2. It will be labeled "Cx231xx Audio" as it is using the hacked Cx231xx kernel driver. For an example you might see:

• Built-in Audio

• Profile: Analog Stereo Output

• Cx231xx Audio

• Profile: Ama;pg Stereo Input

If you click on the "Input Devices" tab you should see, at the top, "Cx231xx Audio Analog Stereo" and below that...

• Cx231xx Audio Analog Stereo

• Port: Analog Input

You will see the horizontal bar fluctuating indicating input sound (if your source has sound) but you will not hear any audio. THis is because there is a "pulseaudio module-loopback" which is not automatically loaded nor can it be loaded though the graphical interface. To add the loopback module to the running instance of Pulse Audio issue the command:

pactl load-module module-loopback

To make the module auto load issue the command:

sudo sh -c ' echo "load-module module-loopback" >> /etc/pulse/default.pa '

Once module-loopback is loaded the pulse audio Volume Control panel will add an option to the Recording tab that allows selection to use on the loopback device.

reference: pulseaudio and saa7134 audio device

No additional audio related parameters were necessary to use on the mplayer command line for the test.

mplayer tv:// -tv device=/dev/video0:norm=NTSC

Now with picture and sound.

Note: If you see a green picture with flickering lines at the top, then mplayer is attempting to play an NTSC video as PAL. Again, the dopey kernel driver assumes PAL unless you specify NTSC. You can see the problem in dmesg:

cx231xx #0: do_mode_ctrl_overrides PAL

We can test using gnome-mplayer which is the graphical gnome version part of the deb package gnome-mplayer installed via the command:

sudo apt-get install gnome-mplayer

gnome-mplayer does not accept some of the same command line switches as mplayer. It wont accept norm=NTSC.

Adding to MythTV backend configuration

So far unsuccessful. In progress..