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Detecting Unencrypted HD channels
PostPosted: Tue Apr 04, 2006 7:06 am Reply with quote
billpwl1
 
Joined: 21 Mar 2006
Posts: 2




Installed Hardware: Dual PIII 1.0 ghz, 512 Meg Ram Geforce 6200 video, pchdtv3000, hauppauge pci tvtuner.
Software:
Fedora Core 4: Linux 2.6.15-1.1831_FC4smp #1 SMP Tue Feb 7 13:48:31 EST 2006 i686 i686 i386 GNU/Linux

mythbackend --version
Library API version: 0.19.20060121-2
Source code version: Unknown
Options compiled in:
linux release using_xvmcw using_v4l using_oss using_alsa using_arts using_ivtv using_firewire using_dbox2 using_lirc using_joystick_menu using_dvb using_dvb_eit using_x11 using_xv using_dvdnav using_xrandr using_xvmc using_xvmc_vld using_opengl_vsync using_frontend using_backend

mplayer --version
MPlayer 1.0pre7try2-3.2.3 (C) 2000-2005 MPlayer Team
CPU: Intel Celeron 2/Pentium III Coppermine,Geyserville (Family: 6, Stepping: 10)
Detected cache-line size is 32 bytes
CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2 SSE

xine --version
This is xine (X11 gui) - a free video player v0.99.2.
(c) 2000-2004 The xine Team.

i understand that this hardware isn't even close to being fast enough to view hd format video. this hardware is only intended as a recording backend. at this point I am only trying to determine what my available unencrypted HD channels are.

I am following the procedures outlined in the mythtv wiki at: http://www.mythtv.org/wiki/index.php/Adding_QAM_Channels_For_HDTV_Tuner_Cards

I have scanned for channels using atscscan and got a channels.conf with 233 detected channels. here is a small sample of this channels.conf:
[000-0002]:561000000:QAM_256:2112:2113:2
[001-0003]:561000000:QAM_256:2176:2177:3
[002-0004]:561000000:QAM_256:2240:2241:4
[003-0005]:561000000:QAM_256:2304:2305:5
[004-0006]:561000000:QAM_256:2368:2369:6
[005-0007]:561000000:QAM_256:2432:2433:7
[006-0009]:561000000:QAM_256:2496:2497:9
[007-000a]:561000000:QAM_256:2560:2561:10
[008-000b]:561000000:QAM_256:2624:2625:11
[009-000c]:561000000:QAM_256:2688:2689:12
[00a-0001]:561000000:QAM_256:2048:2049:1
[00b-000d]:567000000:QAM_256:2048:2049:13

Using azap to tume one of the channels returns the following:

azap [00b-000d]
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 567000000 Hz
video pid 0x0800, audio pid 0x0801
status 00 | signal aabf | snr fd13 | ber 00000000 | unc 00000000 |
status 00 | signal fdf2 | snr fd45 | ber 00000000 | unc 00000000 |
status 1f | signal f3f6 | snr fd4d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 00 | signal fdf2 | snr fd83 | ber 00000000 | unc 00000000 |
status 1f | signal fdf2 | snr fd93 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal dfff | snr fc8d | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal fdf2 | snr fd9b | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 00 | signal ffff | snr fd91 | ber 00000000 | unc 00000000 |
status 1f | signal f8d4 | snr fce5 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal fdf2 | snr fcd5 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal f3f6 | snr fd69 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ffff | snr fd4f | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal e394 | snr fce1 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal f8d4 | snr fd3b | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ef9c | snr fd53 | ber 00000000 | unc 00000000 | FE_HAS_LOCK

So at this point I am assumming that I have a tuner card that is working. When I try to play the stream using: mplayer -nosound /dev/dvb/adapter0/dvr0

I get the following output:

MPlayer 1.0pre7try2-3.2.3 (C) 2000-2005 MPlayer Team
CPU: Intel Celeron 2/Pentium III Coppermine,Geyserville (Family: 6, Stepping: 10)
Detected cache-line size is 32 bytes
CPUflags: MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2 SSE


Playing /dev/dvb/adapter0/dvr0.

and that is all. No new windows open with video of any form. top shows no significant cpu usage and mplayer isn't using any processing cycles at all:
top -n5b | grep mplayer

top - 09:40:13 up 9 days, 14:12, 6 users, load average: 0.71, 0.37, 0.39
Tasks: 118 total, 1 running, 117 sleeping, 0 stopped, 0 zombie
Cpu0 : 2.9% us, 0.5% sy, 1.5% ni, 94.0% id, 0.4% wa, 0.1% hi, 0.5% si
Cpu1 : 2.9% us, 0.5% sy, 1.4% ni, 94.1% id, 0.5% wa, 0.1% hi, 0.5% si
Mem: 512600k total, 498008k used, 14592k free, 27208k buffers
Swap: 0k total, 0k used, 0k free, 135032k cached

PID USER PR NI VIRT RES SHR S P %CPU %MEM TIME+ COMMAND

26018 bill 18 0 29028 7148 3144 S 0 0.0 1.4 0:00.09 mplayer
26018 bill 18 0 29028 7148 3144 S 0 0.0 1.4 0:00.09 mplayer
26018 bill 18 0 29028 7148 3144 S 0 0.0 1.4 0:00.09 mplayer
26018 bill 18 0 29028 7148 3144 S 0 0.0 1.4 0:00.09 mplayer
26018 bill 18 0 29028 7148 3144 S 0 0.0 1.4 0:00.09 mplayer

a ctrl-c breaks mplayer out with this response:
MPlayer interrupted by signal 2 in module: demux_open

So clearly mplayer isn't doing anything with the video stream.

Could this be:
1. a bad build of mplayer?
mplayer can play mpg files that were recorded on another machine.
2. insufficient hardware to play the stream?
3. a typical response to an encrypted channel? I am skipping through the channel list but get the same response from all channels tried so far.


I hope this is enough info to point to a problem area. Any help would be appreciated.

Thanks,
Bill
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PostPosted: Tue Apr 04, 2006 9:32 am Reply with quote
xyzzy
 
Joined: 12 Feb 2006
Posts: 225




You need to use the -r switch to azap if you want to to output the TS stream to the dvr0 device.

However, you are better off using mplayer's dvb support. Put your channels.conf in ~/.mplayer, and use:

mplayer dvb://[00b-000d]
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Detecting Unencrypted HD channels
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