Difference between revisions of "Watch analog cable TV"

From LinuxIntro
Jump to: navigation, search
(Software choice)
Line 196: Line 196:
 
* mythtv
 
* mythtv
 
* vdr
 
* vdr
 +
* xbmc
  
 
= See also =
 
= See also =

Revision as of 10:24, 29 November 2011

Here is how you can watch TV on your Linux desktop using a USB TV controller.

Snapshot-tv-watching-50percent.png

Contents

Hauppauge PVR USB 2

This description works with a Hauppauge PVR USB 2, a TV Tuner that you attach via USB to your computer. It uses Mike Isely's driver pvrusb2. It may work same or similar for other TV tuners, but we did not test it. We tested it with SUSE Linux 11 and 11.1. Other distributions will probably work same or similar.

Get it work

Get a video device

  • connect your TV Tuner via USB to your computer and to the electric power supply. Verify you did it right:
# hwinfo --usb --short
[...]
tv card:
                       Hauppauge WinTV
[...]
  • get the firmware
mkdir -p /lib/firmware/
cd /lib/firmware
wget http://dl.ivtvdriver.org/ivtv/firmware/ivtv-firmware.tar.gz
tar xvzf ivtv-firmware.tar.gz
  • verify you have the driver
modprobe -l | grep pvr
/lib/modules/2.6.25.11-0.1-default/kernel/drivers/media/video/pvrusb2/pvrusb2.ko
  • load the driver
modprobe pvrusb2
  • make sure the driver has loaded
dmesg
usbcore: registered new interface driver pvrusb2       
drivers/media/video/pvrusb2/pvrusb2-main.c: Hauppauge WinTV-PVR-USB2 MPEG2 Encoder/Tuner : V4L in-tree version
drivers/media/video/pvrusb2/pvrusb2-main.c: Debug mask is 31 (0x1f)                                           
pvrusb2: Device microcontroller firmware (re)loaded; it should now reset and reconnect.                       
usb 2-4: USB disconnect, address 4                                                                            
pvrusb2: Device being rendered inoperable                                                                     
usb 2-4: new high speed USB device using ehci_hcd and address 5                                               
usb 2-4: configuration #1 chosen from 1 choice                                                                
usb 2-4: New USB device found, idVendor=2040, idProduct=2400                                                  
usb 2-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3                                             
usb 2-4: Product: WinTV                                                                                       
usb 2-4: Manufacturer: Hauppauge                                                                              
usb 2-4: SerialNumber: 2401-00-0082BA22                                                                       
usb 2-4: reset high speed USB device using ehci_hcd and address 5                                             
cx25840' 4-0044: cx25843-24 found @ 0x88 (pvrusb2_a)                                                          
tuner' 4-0043: chip found @ 0x86 (pvrusb2_a)                                                                  
tda9887 4-0043: tda988[5/6/7] found                                                                           
tuner' 4-0061: chip found @ 0xc2 (pvrusb2_a)                                                                  
wm8775' 4-001b: chip found @ 0x36 (pvrusb2_a)                                                                 
tveeprom 4-00a2: Hauppauge model 24019, rev C389, serial# 8567330                                             
tveeprom 4-00a2: tuner model is TCL MFPE05 2 (idx 89, type 38)                                                
tveeprom 4-00a2: TV standards PAL(B/G) PAL(I) SECAM(L/L') PAL(D/D1/K) (eeprom 0x74)                           
tveeprom 4-00a2: audio processor is CX25843 (idx 37)                                                          
tveeprom 4-00a2: decoder processor is CX25843 (idx 30)                                                        
tveeprom 4-00a2: has radio, has IR receiver, has no IR transmitter                                            
pvrusb2: Supported video standard(s) reported available in hardware: PAL-B/B1/D/D1/G/H/I/K;SECAM-B/D/G/H/K/K  
pvrusb2: Mapping standards mask=0xff00ff (PAL-B/B1/D/D1/G/H/I/K;SECAM-B/D/G/H/K/K1/L/LC)                      
pvrusb2: Setting up 20 unique standard(s)                                                                     
pvrusb2: Set up standard idx=0 name=PAL-B/G                                                                   
pvrusb2: Set up standard idx=1 name=PAL-D/K                                                                   
pvrusb2: Set up standard idx=2 name=SECAM-B/G                                                                 
pvrusb2: Set up standard idx=3 name=SECAM-D/K                                                                 
pvrusb2: Set up standard idx=4 name=PAL-B                                                                     
pvrusb2: Set up standard idx=5 name=PAL-B1                                                                    
pvrusb2: Set up standard idx=6 name=PAL-G                                                                     
pvrusb2: Set up standard idx=7 name=PAL-H                                                                     
pvrusb2: Set up standard idx=8 name=PAL-I                                                                     
pvrusb2: Set up standard idx=9 name=PAL-D                                                                     
pvrusb2: Set up standard idx=10 name=PAL-D1                                                                   
pvrusb2: Set up standard idx=11 name=PAL-K                                                                    
pvrusb2: Set up standard idx=12 name=SECAM-B                                                                  
pvrusb2: Set up standard idx=13 name=SECAM-D                                                                  
pvrusb2: Set up standard idx=14 name=SECAM-G                                                                  
pvrusb2: Set up standard idx=15 name=SECAM-H
pvrusb2: Set up standard idx=16 name=SECAM-K
pvrusb2: Set up standard idx=17 name=SECAM-K1
pvrusb2: Set up standard idx=18 name=SECAM-L
pvrusb2: Set up standard idx=19 name=SECAM-LC
pvrusb2: Initial video standard auto-selected to PAL-B/G
pvrusb2: Device initialization completed successfully.
  • make sure an additional video device exists
ls /dev/video*
/dev/video  /dev/video0

Watch TV

According to http://www.isely.net/pvrusb2/usage.html#V4L, your watching application needs to be capable of decoding an mpeg2 stream.

  • watch that you see a video signal
gqcam /dev/video

You will not be able to switch channels, and it is not sure you see more than snow. How to go on, depends on your distribution:

SUSE Linux 11 and 11.1

  • make sure you have one (and not more) soundcard and it works.
  • make sure the videolan (VLC) repository is contained in your yast installation repositories:
yast2 -> Software -> Software Repositories -> Community Repositories -> Videolan
  • Install several development packages
yast -i libmpeg2-devel
yast -i zvbi-devel
yast -i arts-devel
yast -i kdelibs3-arts
yast -i kdemultimedia3-arts-mad
yast -i libmpg123-arts
yast -i openmotif-devel
yast -i aalib-devel
yast -i libdv-devel
yast -i libmad-devel

Download xawtv's latest cvs snapshot from http://dl.bytesex.org/cvs-snapshots/?N=A. In this example, we assume it is xawtv-20081014-100645.tar.gz.

  • Unpack the snapshot
tar xvzf xawtv-20081014-100645.tar.gz
cd xawtv
  • Configure the compile
./autogen.sh
./configure
  • build it
make 
  • install it
make install
  • prepare the sender list for xawtv by calling
scantv

You are asked some questions. If you do not know what PAL standard your country uses, consult wikipedia.

  • start it
/usr/local/bin/xawtv

Record a video

To capture a video with sound, do

echo false >/sys/class/pvrusb2/sn-*/ctl_mute/cur_val && cat /dev/video > myvideo.mpg

In this case, we assume /dev/video is the video device that you created above. This command is possible because mpeg2 data is streamed over /dev/video. It contains sound.

TroubleShooting

no such file or directory

Symptom

open(/dev/dsp): No such file or directory
ALSA lib pcm_hw.c:1240:(_snd_pcm_hw_open) Invalid value for card
alsa: open plughw: No such file or directory
open(/dev/dsp): No such file or directory

Solution

Remove every soundcard but one, re-configure sound using yast2 sound, restart sound system using /etc/init.d/alsasound restart

Invalid value for card

Symptom

ALSA lib pcm_hw.c:1240:(_snd_pcm_hw_open) Invalid value for card
alsa: open plughw: No such file or directory

Solution

Remove every soundcard but one, re-configure sound using yast2 sound, restart sound system using /etc/init.d/alsasound restart

There is no sound

Symptom 1

You have several soundcards. Your speakers are attached to /dev/dsp, but nevertheless, there is no sound.

Reason 1

The reason is partly unclear. It seems that xawtv does not in all cases send sound output to /dev/dsp, it seems to enumberate the sound cards differently.

Solution 1

Remove every soundcard but one, re-configure sound using yast2 sound, restart sound system using /etc/init.d/alsasound restart

Symptom 2

When starting xawtv, you get an error message "can't play audio stream". Then there is no audio to be heard.

Reason 2

Another application is blocking your soundcard.

Solution 2

Use lsof to find out what application is blocking your soundcard. Quit it:

lsof | grep /dev/dsp

module: pvrusb2 not found

Symptom

When loading the module you get the error msg:

FATAL: Module pvrusb2 not found.

Reason

The module loader needs to understand the dependencies first

Solution

depmod -a

More information

  • ~/.tv contains config files for xawtv4
  • good irc channels for your needs are on freenode: #v4l, #pvrusb2 and #mythtv-users
  • switch frequency like this:
echo "182270001" > /sys/class/pvrusb2/sn-8567330/ctl_frequency/cur_val

Switch on hr

echo "55250000" > /sys/class/pvrusb2/sn-8567330/ctl_frequency/cur_val

Software choice

  • xawtv
  • mythtv
  • vdr
  • xbmc

See also