[mythtv-users] Can't Open HDTV Card

[Gray]

Thank you again :)

I ran this:
[mythtv at localhost dvb-atsc-tools-1.0.4]$ dtvscan -dvb 0 -c 2:20 -o
scantest
dtvscan ver 1.0.4 - by Jack Kelliher (c) 2002,2005,2006
Opened FE:/dev/dvb/adapter0/frontend0 3
Opened DMX:/dev/dvb/adapter0/demux0 4
Opened DVR:/dev/dvb/adapter0/dvr0 5
channel = 2 VSB_8
channel = 3 VSB_8
channel = 4 VSB_8
channel = 5 VSB_8
channel = 6 VSB_8
channel = 7 VSB_8
channel = 8 VSB_8
channel = 9 VSB_8
channel = 10 VSB_8
channel = 11 VSB_8
channel = 12 VSB_8
channel = 13 VSB_8
channel = 14 VSB_8
channel = 15 VSB_8
channel = 16 VSB_8
channel = 17 VSB_8
channel = 18 VSB_8
channel = 19 VSB_8
channel = 20 VSB_8

I just showed it because it is the same for all of the channels.

Then I checked the output file "scantest" which is empty:

[mythtv at localhost dvb-atsc-tools-1.0.4]$ ls -l scantest
-rw-rw-r-- 1 mythtv mythtv 0 Jan  1 13:42 scantest


Of the options below should I be scanning the device name directly with:
          
device      : V4L2 device name (-dvb option will override)

If so exactly what would my device name be?

Gray


 

On Mon, 2007-01-01 at 03:49 -0500, R. G. Newbury wrote:
> Gray wrote:
> > Thank you for the response :) 
> >> 1) Determining if your card is working.
> > 
> >> Do you have a folder structure under /dev/dvb ??? 
> >> You should have /dev/dvb/adapter0 and under that a demux0, frontend0 and 
> >> dvr0 folders.
> > 
> > Yes I have all of these folders :)
> >
> > -rwxrwxr-x 1 mythtv mythtv 27646 Dec 31 16:18 dtvscan
> >
> > I ran the dtvscan file.  It checked 109 channels just like the mythsetup
> > did.  
> > Question: how do I know if it scanning for ATSC signals or DVB?
> > 
> > *[mythtv at localhost dvb-atsc-tools-1.0.4]$ ./dtvscan
> > dtvscan ver 1.0.4 - by Jack Kelliher (c) 2002,2005,2006
> > Attempting to open /dev/dtv
> > Opened FE:/dev/dvb/adapter0/frontend0 4
> > Opened DMX:/dev/dvb/adapter0/demux0 5
> > Opened DVR:/dev/dvb/adapter0/dvr0 6
> > channel = 2 VSB_8
> > channel = 3 VSB_8
> > channel = 4 VSB_8
> > channel = 5 VSB_8
> > channel = 6 VSB_8
> > channel = 7 VSB_8
> > channel = 8 VSB_8
> > channel = 9 VSB_8
> >
> You don't show the full command line. You should be using:
> 
> dtvscan -q -dvb 0 -c 2:150 -o output. The -q is only for QAM256 and you 
> want an output file.
> A channels.conf looks like this for QAM256: the important number being 
> the last one: the serviceid.
> 
> RSE:525000000:QAM_256:16:17:50
> 
> 
> > I only showed a few of the 109 results.  None seem to have any signal?
> > Are the VSB_8 digital channels?
> Yes.
>   If not is it scanning for Analog
> > channels? 
> No
>   How do I correlate the channel Number to the OTA assigned
> > channel number? 
> Run the scan properly and you should see channel designations like 18.1
> 
>   For example for my location channel number 18.1 is the
> > CW channel digitally broadcast OTA signal(Webantenna site) is is
> > actually channel 17 according to the FCC? Oh to make it more confusing
> > some are shown as HD and I am told there is a format called SD and I am
> > clueless about the difference.  But once we can determine if the card is
> > working or at least scanning for Digital channels then maybe we tune to
> > the proper signals?
> Lots of stations transmit HD and SD versions of the same program on 
> different subchannels  18.1/18.2 etc.
> 
> > Then I tried the dtvsignal check on several of the known high strength
> > digital channels; the ones that should have lined up with my local
> > broadcast channels and all showed as Signal: 000.
> > 
> > [mythtv at localhost dvb-atsc-tools-1.0.4]$ ./dtvsignal 35
> > using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> > tuning to 599000000 Hz
> > video pid 0x0021, audio pid 0x0024
> > dtvsignal ver 1.0.4 - by Jack Kelliher (c) 2002,2005,2006
> > channel = 35 freq = 599000000Hz
> > 30db       0%         25%         50%         75%        100%
> > Signal:     |     .     :     .     |     ._____:_____._____|
> > Signal: 000 .
> > 
> > 
> > 
> >> You can then use the azap program to tune your card to a particular  
> >> stream, and mplayer to play the stream (mplayer 
> >> dvb://dev/dvb/adapter0/dvr0 is the command IIRC).
> > 
> > I tried to find the azap program you are referring to apparently it is a
> > PChtdv tool but no biggie because you have stated it is the same as the
> > dtvscan program anyways.  I don't know how to stream to mplayer though?
> > I am not sure by the statement:(mplayer  
> >> dvb://dev/dvb/adapter0/dvr0 is the command IIRC) if this is a command I should run?
> >  
> 
> Azap and atscscan are part of the dvb-apps package available at linuxtv.org.
> You run azap, with a tuning file (Cable-Qam256, etc.) to produce a 
> listing of digital streams, and a data dump which is a raw channels.conf 
> with unique names for each stream.
> 
> Then you use azap and the raw file, to tune your card. You can then cat 
> the output from /dev/dvb/adapter0/dvr0 to a file test.mpg, and play the 
> file with mplayer test.mpg, to see whether the stream is playable. There 
> is also a way to play the stream directly.
> 
> Browse the mythtv wiki: there are pages referred to which cover this in 
> detail..
> 
> Geoff
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