Script for analog V4L2 device support in TVH (via pipe:// mux)

Diego Rivera · 2016-01-19T22:05:22+00:00

Hi, all! In my setup, I have need to tune analog channels via Kodi/TVH, which is currently not supported in TVHeadEnd. My solution was to make use of the pi...

Diego Rivera

Try this:

# Uninstall the FFMPEG instance you previously installed (I think <code>make uninstall</code> can do the trick)
# Create a file called /etc/apt/sources.list.d/deb-multimedia.list, with the following contents:


deb http://www.deb-multimedia.org jessie main non-free
#deb-src http://www.deb-multimedia.org jessie main non-free

# Import the GPG keys for that repository


sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 5C808C2B65558117 CBF8D6FD518E17E1

# Install FFMPEG

sudo apt-get update sudo apt-get install ffmpeg

Try the script again :)

David Blackeby

Great that seemed to do the job, and now I can capture a local MPG (albeit tuned to garbage)

I'm trying to capture UHF C68 in the UK (which is tuned to my Sky TV Box), I believe this should be frequency 850.0 Mhz (based on information found here https://ukfree.tv/maps/uhfchannel/68)

I notice from the logs when the scripts run that its actually trying to capture 487.250 Mhz:

./capture-analog -c 68 -s /dev/video0 -o sky.mpg
SOURCES=[/dev/video0]
Will tune to channel [68] (table=default)
Begin capture from /dev/video0 (VBI=none AUDIO=hw:1,0 TUNER=true)
Querying audio capabilities for [hw:1,0]...
/dev/video0: 487.250 MHz
+ /usr/bin/ffmpeg -r 30000/1001 -f v4l2 -i /dev/video0 -f alsa -ac 2 -ar 48000 -i hw:1,0 -f mpegts -c:v mpeg2video -b:v 8000k -filter:v yadif=0:-1:0 -c:a ac3 -b:a 224k -y sky.mpg
ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 4.9.2 (Debian 4.9.2-10)
configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/arm-linux-gnueabihf --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi --enable-avresample --disable-htmlpages --disable-podpages --enable-libutvideo --enable-libfdk-aac --enable-libx265 --enable-libiec61883 --enable-libdc1394 --disable-altivec --shlibdir=/usr/lib/arm-linux-gnueabihf
libavutil 54. 20.100 / 54. 20.100
libavcodec 56. 26.100 / 56. 26.100
libavformat 56. 25.101 / 56. 25.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 11.102 / 5. 11.102
libavresample 2. 1. 0 / 2. 1. 0
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
[video4linux2,v4l2

 0x1b9c960] The driver does not permit changing the time per frame
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 68879.289732, bitrate: 165722 kb/s
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 720x480, 165722 kb/s, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc
Guessed Channel Layout for  Input Stream #1.0 : stereo
Input #1, alsa, from 'hw:1,0':
  Duration: N/A, start: 1457603064.392267, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
No pixel format specified, yuv422p for MPEG-2 encoding chosen.
Use -pix_fmt yuv420p for compatibility with outdated media players.
Output #0, mpegts, to 'sky.mpg':
  Metadata:
    encoder         : Lavf56.25.101
    Stream #0:0: Video: mpeg2video, yuv422p, 720x480, q=2-31, 8000 kb/s, 29.97 fps, 90k tbn, 29.97 tbc
    Metadata:
      encoder         : Lavc56.26.100 mpeg2video
    Stream #0:1: Audio: ac3, 48000 Hz, stereo, fltp, 224 kb/s
    Metadata:
      encoder         : Lavc56.26.100 ac3
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg2video (native))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> ac3 (native))
Press [q] to stop, [?] for help
[alsa

0x1b9dce0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[video4linux2,v4l2 @ 0x1b9c960] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
frame= 135 fps= 12 q=24.8 Lsize= 11656kB time=00:00:04.48 bitrate=21267.7kbits/s
video:10765kB audio:28kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 7.992982%
Received signal 2: terminating.

+ set +x

So I figured I would try the -f command line to specify a frequency, but it just errors:

./capture-analog -f 850 -s /dev/video0 -o sky.mpg

ERROR: Frequency specification [850] is not valid

I've tried 850, 850.0, 850.0Mhz all of which are not valid options (what is the format for using the -f command setting?)

Regards

David

Diego Rivera

What you're looking for is using the tuning tables. In particular, the tables named europe-west, europe-east, italy, newzealand, ireland, france, and southafrica all tune channel 68 to 847.250MHz. In your case I believe you wish to use the table "europe-west", like so:

./capture-analog -t europe-west -c 68 -s /dev/video0 -o sky.mpg

Try that. I get the feeling that will do the trick.

Also in response to someone else's request earlier for "character" channel names, these tables support them - you can actually request to tune channel "E2" or "SE20" (as examples), since they're referenced by that name in the tuning table.

Finally, the frequency parameter is to be given in the same format that<code>ivtv-tune</code> requires it (i.e. 847.250 - in MHz).

Cheers!

Diego Rivera

If you want to see which tuning tables are available, use<code>ivtv-tune -L</code>. You can then use<code>ivtv-tune -t <table> -l</code> (lowercase-L) to list the channel mappings for that table.

Cheers!

David Blackeby

Thanks for the details, I'm getting the following error now though

./capture-analog -t europe-west -c 68 -s /dev/video0 -o sky.mpg
SOURCES=[/dev/video0]

ERROR: Tuning table [europe-west] is invalid

I've checked ivtv-tune -L and can see it listed:

ivtv-tune -L
Frequency Maps:
us-bcast
us-cable
us-cable-hrc
us-cable-irc
japan-bcast
japan-cable
europe-west
europe-east
italy
newzealand
australia
ireland
france
china-bcast
southafrica
argentina

australia-optus

I tried enclosing it in single & double quotes to see if that would make a difference but its not.

fa1 fa1

In your home folder example below

/home/pi

in home directory is a file called .ivtv-tune

modify it to your freq provider, for the user that runs the script / tvheadend.

example for europe-west

$ cat .ivtv-tune
device /dev/video0
#freqtable us-cable

freqtable europe-west

should now work for the channels.

Diego Rivera

You're right. There's a bug in the script. Please find an updated version attached.

This should cover it.

This script also removes the numeric-only check for channel names, which I forgot existed! :)

Now if a channel is named in a frequency table, it can be tuned.

Cheers!

fa1 fa1

Great!
Thanks!
:)

David Blackeby

OK installed the new script, and the command changing the table now doesn't throw an error, however I still think there are problems with the script

Running:

./capture-analog -t europe-west -c 68 -s /dev/video0 -o sky.mpg

Still shows that its using frequency 487.250Mhz rather than 847.250 which is what channel 68 should be using

SOURCES=[/dev/video0]
Using frequency table [europe-west]
Will tune to channel [68] (table=europe-west)
Begin capture from /dev/video0 (VBI=none AUDIO=hw:1,0 TUNER=true)
Querying audio capabilities for [hw:1,0]...

/dev/video0: 487.250 MHz

ivtv-tune -t europe-west -l
Channels/Frequencies (MHz) for 'europe-west':
E2 48.250
E3 55.250
E4 62.250
....
....
67 839.250
68 847.250

69 855.250

I tried falling back and using the -f command (with the full frequency, however it still errors

./capture-analog -f 847.250 -s /dev/video0 -o sky.mpg
ERROR: Frequency specification [847.250] is not valid

Diego Rivera

Try this version. This one should get you sailing smoothly.

Cheers!

Yakumo Fuji

Hi I am trying to get this working but I have run in to some very annoying issues.
If i try to use ffmpeg conversion i get the following -->

capture-analog -t europe-west -c E7 -s /dev/video1 -o -
SOURCES=[/dev/video1]
Using frequency table [europe-west]
Will tune to channel [E7] (table=europe-west)
find: ‘/video4linux’: No such file or directory
find: ‘/lost+found’: Permission denied
find: ‘/tmp/systemd-private-2f22e0c0007649cea449ab2a247f039c-systemd-timesyncd.service-DRzg6N’: Permission denied
find: ‘/tmp/systemd-private-2f22e0c0007649cea449ab2a247f039c-rtkit-daemon.service-V9mSC1’: Permission denied
find: ‘/tmp/systemd-private-2f22e0c0007649cea449ab2a247f039c-colord.service-D8u7R9’: Permission denied
find: ‘/tmp/pulse-PKdhtXMmr18n’: Permission denied
find: ‘/run/wpa_supplicant’: Permission denied
find: ‘/run/sudo’: Permission denied
find: ‘/run/udisks2’: Permission denied
find: ‘/run/gdm3’: Permission denied
find: ‘/run/watershed’: Permission denied
find: ‘/run/lvm’: Permission denied
find: ‘/dev/sundtek’: Permission denied
find: ‘/boot/efi’: Permission denied
find: ‘/boot/lost+found’: Permission denied
find: ‘/root’: Permission denied
Begin capture from /dev/video1 (VBI=none AUDIO=hw:0,0 TUNER=true)
Querying audio capabilities for [hw:0,0]...
+ tune_device /dev/video1
+ local DEVICE=/usr/bin/capture-analog
+ local TUNING_FLAG=
+ local TABLE_FLAG=
+ true
+ true
+ TUNING_FLAG='-c E7'
+ false
+ true
+ TABLE_FLAG='-t europe-west'
+ /usr/bin/ivtv-tune -t europe-west -c E7 -d /dev/video1
/dev/video1: 189.250 MHz  (Signal Detected)
+ /usr/bin/ffmpeg -r 30000/1001 -f v4l2 -i /dev/video1 -f alsa -ac 2 -ar 192000 -i hw:0,0 -f mpegts -c:v mpeg2video -b:v 8000k -filter:v yadif=0:-1:0 -c:a ac3 -b:a 224k -y -
ffmpeg version 2.8.6-1ubuntu2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.1 (Ubuntu 5.3.1-11ubuntu1) 20160311
  configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
[video4linux2,v4l2

0x79c540] ioctl(VIDIOC_G_PARM): Invalid argument
/dev/video1: Invalid argument
+ set +x


I can't figure out what is causing this to happen. (But I suspect something in ffmpeg v4l2 conversion.) 

If i use the -E vlc option it fires up briefly and I get sound from my speakers (should I get that) and then it crashes -->

capture-analog -E vlc -t europe-west -c E7 -s /dev/video1 -o -
SOURCES=[/dev/video1]
Using frequency table [europe-west]
Will tune to channel [E7] (table=europe-west)
find: ‘/video4linux’: No such file or directory
find: ‘/lost+found’: Permission denied
find: ‘/tmp/systemd-private-2f22e0c0007649cea449ab2a247f039c-systemd-timesyncd.service-DRzg6N’: Permission denied
find: ‘/tmp/systemd-private-2f22e0c0007649cea449ab2a247f039c-rtkit-daemon.service-V9mSC1’: Permission denied
find: ‘/tmp/systemd-private-2f22e0c0007649cea449ab2a247f039c-colord.service-D8u7R9’: Permission denied
find: ‘/tmp/pulse-PKdhtXMmr18n’: Permission denied
find: ‘/run/wpa_supplicant’: Permission denied
find: ‘/run/sudo’: Permission denied
find: ‘/run/udisks2’: Permission denied
find: ‘/run/gdm3’: Permission denied
find: ‘/run/watershed’: Permission denied
find: ‘/run/lvm’: Permission denied
find: ‘/dev/sundtek’: Permission denied
find: ‘/boot/efi’: Permission denied
find: ‘/boot/lost+found’: Permission denied
find: ‘/root’: Permission denied
Begin capture from /dev/video1 (VBI=none AUDIO=hw:0,0 TUNER=true)
Querying audio capabilities for [hw:0,0]...
+ set +x
+ exec /usr/bin/cvlc -I dummy --quiet --live-caching 500 --v4l2-fps 0 --v4l2-dev /dev/video1 --v4l2-tuner-audio-mode 3 --v4l2-standard PAL-B/B1/G --v4l2-tuner-frequency 189250 --v4l2-chroma YUYV --input-slave alsa://hw:0,0 --sout-mux-caching 500 --sout '#transcode{vcodec=mp2v,vb=8000,vfilter=deinterlace,scale=Auto,acodec=a52,ab=224,channels=2,samplerate=192000}:file{mux=ts,dst=-}' --play-and-exit v4l2:///dev/video1
VLC media player 2.2.2 Weatherwax (revision 2.2.2-0-g6259d80)
/usr/bin/capture-analog: line 267: 20321 Floating point exception(core dumped) coproc COPROC exec "${CVLC}" -I dummy --quiet --live-caching 500 --v4l2-fps 0 --v4l2-dev ${SOURCE} ${SAP:+--v4l2-tuner-audio-mode ${SAP}} ${STANDARD:+--v4l2-standard ${STANDARD}} ${FREQUENCY:+--v4l2-tuner-frequency ${FREQUENCY%.*}} ${SOURCE_VBI:+--v4l2-vbidev ${SOURCE_VBI}} ${PIXEL_FORMAT:+--v4l2-chroma ${PIXEL_FORMAT}} ${SOURCE_AUDIO:+--input-slave alsa://${SOURCE_AUDIO}} --sout-mux-caching 500 --sout "${TRANSCODE}:file{mux=ts,dst=-}" --play-and-exit v4l2://${SOURCE}
/usr/bin/capture-analog: line 356: kill: (20321) - No such process
Copy stopped...
/usr/bin/capture-analog: line 356: kill: (20321) - No such process

vlc 2.2.2

ffmpeg version 2.8.6

Does anyone got any ideas?

Capture card is a Sundtek Media Pro I.
If i tune the card with v4l2-ctl and then open the device inside vlc it is working fine.

Max Nordanåker

Hi, I have been trying to get this script going for a couple of days with no luck. I think Im close though.

Tuner card : Sundtek MediaTV Pro 3 DVB-C

Computer : Raspberry Pi 2 running wheezy with Tvheadend 4.08

Error log in terminal:

root@tvheadend:/home/hts/.hts/tvheadend# ./capture-analog -t europe-west -c SE12 -s /dev/video0 -o -
SOURCES=[/dev/video0]
Using frequency table [europe-west]
Will tune to channel [SE12] (table=europe-west)
find: `/video4linux': No such file or directory
Begin capture from /dev/video0 (VBI=none AUDIO=hw:0,0 TUNER=true)
Querying audio capabilities for [hw:0,0]...
+ tune_device /dev/video0
+ local DEVICE=./capture-analog
+ local TUNING_FLAG=
+ local TABLE_FLAG=
+ true
+ true
+ TUNING_FLAG='-c SE12'
+ false
+ true
+ TABLE_FLAG='-t europe-west'
+ /usr/bin/ivtv-tune -t europe-west -c SE12 -d /dev/video0
/dev/video0: 238.250 MHz (Signal Detected)
+ /usr/bin/ffmpeg -r 30000/1001 -f v4l2 -i /dev/video0 -f alsa -ac -ar -i hw:0,0 -f mpegts -c:v mpeg2video -b:v 8000k -filter:v yadif=0:-1:0 -c:a ac3 -b:a 224k -y -
ffmpeg version 0.8.17-6:0.8.17-2+rpi1+deb7u1, Copyright (c) 2000-2014 the Libav developers
built on May 18 2016 02:40:46 with gcc 4.6.3
The ffmpeg program is only provided for script compatibility and will be removed
in a future release. It has been deprecated in the Libav project to allow for
incompatible command line syntax improvements in its replacement called avconv
(see Changelog for details). Please use avconv instead.
Unknown input format: 'v4l2'

+ set +x

Any ideas guys?

Diego Rivera

At this point, it looks as if that device doesn't work the same way the other USB devices I have available do. This makes it impossible for me to debug directly.

But I'm not 100% helpless. There's a "hidden" debug flag (-g) that you can use to produce more output, but it's not fully implemented in the version you guys have. Try this version (attached), instead. It adds some checks and makes sure the debug flag works as intended.

Post the full output with the "-g" flag on, and we can take it from there.

Cheers!

Max Nordanåker

Thanks for the help! I contacted Sundtek also, they said something about TVheadend not supporting dual mode tuners and that they are building their own streaming service, that will be available soon for Linux.

But I tried the new script and it said:

root@tvheadend:/home/hts/.hts/tvheadend# ./capture-analog -t europe-west -c SE12 -s /dev/video0 -o -g
SOURCES=[/dev/video0]
Using frequency table [europe-west]
Will tune to channel [SE12] (table=europe-west)
Device [/dev/video0] is not a valid video device, skipping

root@tvheadend:/home/hts/.hts/tvheadend#

-----

root@tvheadend:/home/hts/.hts/tvheadend# ./capture-analog -g
+ getopts :s:c:t:f:o:E:g OPT -g
+ false
+ TARGET=-
+ false
+ '[' -z '' ']'
+ err 'No devices specified, will attempt to discover them'
+ say 'No devices specified, will attempt to discover them'
+ echo -e 'No devices specified, will attempt to discover them'
No devices specified, will attempt to discover them
++ find /sys/class/video4linux -mindepth 1 -maxdepth 1 -name 'video*' -type l -printf '%f\n'
++ sed -e 's;^;/dev/;g'
++ paste -sd , -
++ sort
+ SOURCES=
+ IFS=', '
+ read -r -a SOURCES
+ '[' 0 -lt 1 ']'
+ fail 'No sources found or specified'
+ err 'ERROR: No sources found or specified'
+ say 'ERROR: No sources found or specified'
+ echo -e 'ERROR: No sources found or specified'
ERROR: No sources found or specified
+ exit 1
root@tvheadend:/home/hts/.hts/tvheadend#

Diego Rivera

Ok...I have a better idea of what's (not) going on here. First, you're right that TVH doesn't support dual-mode tuners. That's what this script addresses - it accesses the tuners directly using the Video4Linux2 API and command-line utilities to produce a stream that TVH can then propagate "outwards". In that respect, the tuners aren't even accessed directly by TVH.

Second, it appears the tuner either doesn't have drivers for V4L2, or names the devices something other than /dev/videoX. Can you run the following commands, and tell me their output?

# List the V4L devices that are availablevia v4l API

 v4l2-ctl --list-devices

# List all the info V4L knows about_+any+_ video capture devices

 v4l2-ctl --all

# List the V4L devices that are available via/sys

find /sys/class/video4linux -mindepth 1 -maxdepth 1

This info will help me in making any adjustments to the script to support your stuff, assuming V4L supports the device to begin with.

Cheers!

Max Nordanåker

Here is the output I got when running the commands:

root@tvheadend:/home/pi# v4l2-ctl --list-devices
Sundtek MediaTV Pro 2k12 (usb-):
/dev/video0
/dev/radio0
/dev/vbi0
---------
root@tvheadend:/home/pi# v4l2-ctl --all
Driver Info (not using libv4l2):
Driver name : Sundtek
Card type : Sundtek MediaTV Pro 2k12
Bus info : usb-
Driver version: 4.0.0
Capabilities : 0x84030001
Video Capture
Tuner
Audio
Streaming
Device Capabilities
Device Caps : 0x04030001
Video Capture
Tuner
Audio
Streaming
Frequency for tuner 0: 3924 (245.250000 MHz)
Tuner 0:
Name : Tuner
Capabilities : 62.5 kHz multi-standard stereo
Frequency range : 44.000 MHz - 958.000 MHz
Signal strength/AFC : 100%/0
Current audio mode : mono
Available subchannels:
Video input : 0 (Television: ok)
Audio input : 0 (TV)
Video Standard = 0x00000007
PAL-B/B1/G
Format Video Capture:
Width/Height : 720/576
Pixel Format : 'UYVY'
Field : Interlaced
Bytes per Line: 1440
Size Image : 829440
Colorspace : Broadcast NTSC/PAL (SMPTE170M/ITU601)
Format VBI Capture:
Sampling Rate : 27000000 Hz
Offset : 0 samples (0 secs after leading edge)
Samples per Line: 1440
Sample Format : GREY
Start 1st Field : 6
Count 1st Field : 17
Start 2nd Field : 317
Count 2nd Field : 12
Crop Capability Video Capture:
Bounds : Left 0, Top 0, Width 720, Height 576
Default : Left 0, Top 0, Width 720, Height 720
Pixel Aspect: 54/59
Crop: Left 0, Top 0, Width 720, Height 576
brightness (int) : min=0 max=100 step=1 default=50 value=50
contrast (int) : min=0 max=100 step=0 default=50 value=50
saturation (int) : min=0 max=100 step=1 default=50 value=50
volume (int) : min=0 max=255 step=1 default=219 value=219
mute (bool) : default=0 value=0
soft_volume (int) : min=0 max=100 step=1 default=100 value=0
treble (int) : min=0 max=100 step=1 default=100 value=0
--------
root@tvheadend:/home/pi# find /sys/class/video4linux -mindepth 1 -maxdepth 1
root@tvheadend:/home/pi#

Diego Rivera

Hmmm....for some reason the /sys interface isn't working as I expect it to with respect to V4L devices. Let me research this a little. The /sys interface is used to identify the audio device associated with the video input device. This way we can produce a single, homogenous stream that includes both audio (captured from the appropriate ALSA device) and videdo, turn it into an MPEG2 stream, and send it to TVHeadend.

As I said - I'll need to figure this out. In the mean time: what Linux (distro/version) are you using? Also, can you run these two commands to help me figure things out:



 lsmod | grep -i v4l



 lsmod | grep -i video

Cheers!

Max Nordanåker

Diego Rivera wrote:
> Hmmm....for some reason the /sys interface isn't working as I expect it to with respect to V4L devices. Let me research this a little. The /sys interface is used to identify the audio device associated with the video input device. This way we can produce a single, homogenous stream that includes both audio (captured from the appropriate ALSA device) and videdo, turn it into an MPEG2 stream, and send it to TVHeadend.
>
> As I said - I'll need to figure this out. In the mean time: what Linux (distro/version) are you using? Also, can you run these two commands to help me figure things out:
>
>
lsmod | grep -i v4l
>

 lsmod | grep -i video

> Cheers!

Hello! Have been away for a while.

When I run the commands I get:

root@headendserver:/home/hts/.hts/tvheadend# lsmod | grep -i v4l

root@headendserver:/home/hts/.hts/tvheadend# lsmod | grep -i video

This is my setup:

Raspberry Pi with Raspbian Jessie Lite

-- Max

Diego Rivera

Maybe this device requires specific firmware to be loaded prior to use? Maybe a userland service needs to be started or configured?

Without one of these devices to test with, it's impossible for me to debug the issue if the device behaves differently from the other "more standard" devices out there. I have tested this script with two different Hauppauge devices, and others have had success with other devices.

Not sure what I can do to help here...

Max Nordanåker

No problem. Did see that it was an hassel to get the analog output working or just to tune the analog channels manually so I ended up ordering the Hauppauge-tuner instead.

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