Andy,
Thanks for the pointers! What I'm trying to get working is the unencrypted
channels that are available
on my terrestrial digital cable, which are evidently QAM-256.
I used "w_scan -fa -A2 -c US -X -o 7" to generate a channels.conf file. w_scan
successfully finds all the
digital channels I expect to see, both HD and SD. I then use azap to tune, but
it seems the audio portion
is missing. The "audio pid" that azap reports is 0x0000:
% azap -c channels.conf -r 'KABC HD'
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
tuning to 783000000 Hz
video pid 0x1556, audio pid 0x0000
status 07 | signal 0186 | snr 0186 | ber 00000000 | unc 00000000 |
status 1f | signal 0190 | snr 0190 | ber 000000b4 | unc 000000b4 | FE_HAS_LOCK
status 1f | signal 0190 | snr 0190 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
etc.
dvbtraffic reports this:
-PID--FREQ-----BANDWIDTH-BANDWIDTH-
0000 10 p/s 1 kb/s 16 kbit
1555 15 p/s 2 kb/s 23 kbit
1556 9901 p/s 1817 kb/s 14891 kbit
1557 262 p/s 48 kb/s 394 kbit
1558 133 p/s 24 kb/s 200 kbit
155f 15 p/s 2 kb/s 23 kbit
1560 8998 p/s 1651 kb/s 13532 kbit
1561 260 p/s 47 kb/s 391 kbit
1562 133 p/s 24 kb/s 200 kbit
1569 15 p/s 2 kb/s 23 kbit
156a 4720 p/s 866 kb/s 7099 kbit
156b 309 p/s 56 kb/s 464 kbit
156c 265 p/s 48 kb/s 399 kbit
1aa0 2 p/s 0 kb/s 4 kbit
1aa1 2 p/s 0 kb/s 4 kbit
1aa2 2 p/s 0 kb/s 4 kbit
1aa3 2 p/s 0 kb/s 4 kbit
1ffb 8 p/s 1 kb/s 13 kbit
1fff 892 p/s 163 kb/s 1342 kbit
2000 25956 p/s 4765 kb/s 39038 kbit
Then (as a consequence, I guess) Mplayer says "no audio":
% mplayer /dev/dvb/adapter0/dvr0
MPlayer SVN-r33254-snapshot-4.5.1 (C) 2000-2011 MPlayer Team
Can't open joystick device /dev/input/js0: No such file or directory
Can't init input joystick
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing /dev/dvb/adapter0/dvr0.
TS file format detected.
VIDEO MPEG2(pid=5462) NO AUDIO! NO SUBS (yet)! PROGRAM N. 0
VIDEO: MPEG2 1280x720 (aspect 3) 59.940 fps 38810.4 kbps (4851.3 kbyte/s)
Load subtitles in /dev/dvb/adapter0/
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2)
==========================================================================
Audio: no sound
The HD video playback looks great, however. (I'm not worrying about joystick or
LIRC controls at
this point, as this is a desktop PC.)
I don't see any obvious errors in dmesg, except this:
cx18-0: Unreasonably low latency timer, setting to 64 (was 32)
But it looks like the driver automatically fixed that problem. Hmm, is there
supposed to be
a /dev/dvb/adapter0/audio0 file? All I have is demux0, dvr0, frontend0 and
net0.
>________________________________
>From: Andy Walls <[email protected]>
>To: Greg Fruth <[email protected]>; User discussion about IVTV
><[email protected]>
>Cc: "[email protected]" <[email protected]>; [email protected]
>Sent: Saturday, June 4, 2011 5:53 AM
>Subject: Re: [ivtv-users] HVR-1600 analog no signal
>
>On Fri, 2011-06-03 at 23:01 -0700, Greg Fruth wrote:
>> I have the reverse problem in Fedora 14 (HVR-1600 model 1388): the
>> analog side
>> works totally fine (at /dev/video0) while I can't get the digital side
>> to tune properly.
>> The digital side has occasionally been able to record in SD and HD,
>> but since the tuning
>> is wrong Mythtv refuses to record, or it records the wrong program.
>> Does your digital
>> side work?
>
>
>MythTV is not a good troubleshooting tool - too many moving parts, so to
>speak.
>
>Instead, use the basic dvb utilities to create a channels.conf file from
>the stdout of [dvb]scan and do some basic tests:
>
>http://www.linuxtv.org/wiki/index.php/User_Information
>http://www.linuxtv.org/wiki/index.php/Testing_your_DVB_device
>
>
>You can then put the channels.conf file into ~/.mplayer/channels.conf
>and use mplayer to test DTV:
>
>(kill the mythbackend and then...)
>
>$ mplayer dvb://WJLA-HD -cache 8192
>MPlayer SVN-r31628-4.4.4 (C) 2000-2010 MPlayer Team
>...
>Playing dvb://WJLA-HD.
>dvb_tune Freq: 177028615
>Cache fill: 19.82% (1662976 bytes)
>TS file format detected.
>VIDEO MPEG2(pid=49) AUDIO A52(pid=52) NO SUBS (yet)! PROGRAM N. 0
>VIDEO: MPEG2 1280x720 (aspect 3) 59.940 fps 17782.8 kbps (2222.8 kbyte/s)
>...
>A:28772.1 V:28771.8 A-V: 0.289 ct: -0.785 1452/1452 54% 0% 2.1% 5 0 13%
>
>
>
>"WJLA-HD" is a channel name in my channels.conf file. (The first field
>on each line is a channel name.)
>
>
>If [dvb]scan can't a decent channels.conf, either the digital tuner
>drivers need work, or you have signal quality problems. Please check
>the list of items here, just in case:
>
>http://ivtvdriver.org/index.php/Howto:Improve_signal_quality
>
>
>Unfortunately my only late model HVR-1600 is in Europe with Hans for
>worldwide analog signal tuning verification. I don't have one in hand
>at the moment. (Maybe I'll just go buy another one this week).
>
>
>Regards,
>Andy
>
>
>
>
_______________________________________________
ivtv-users mailing list
[email protected]
http://ivtvdriver.org/mailman/listinfo/ivtv-users
