[mythtv-users] Detecting unencrypted HD channels

Tue Apr 4 17:04:37 UTC 2006

Bill,

I had similar problems... There are a few scripts that can help to 
automate the search...

http://www.mythtv.org/wiki/index.php/DVB_search
http://www.mythtv.org/wiki/index.php/Talk:DVB_search (an alternative 
using azap)
http://www.tux.org/~peterw/#qamscan (uses azap as well)

I am currently working on a variation of the first script that will 
create a ~15 second mpg using mencoder, and hope to post it soon.

-Ll

William Powell wrote:
> 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.
>
> myth tv works fine for recording and viewing SDTV using either the 
> hdtv3000 or hauppauge tuner cards.  Live TV is a little dodgy when using 
> this machine as a frontend, but it works.
>
> Installed Hardware:
> Dual PIII 1.0 Ghz, 512 Meg Ram Geforce 6200 video, pchdtv3000, hauppauge 
> pci tv tuner. ~220 gb lvm storage on 2 udma100 drives.
>
> 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 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 sdtv 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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