[mythtv-users] Audio without Video?!

Albert Ulmer jayaeu at gmail.com
Tue Oct 12 19:23:07 UTC 2004


I've been struggling trying to get my DVB-c card to work with MythTV.
I'm at the point where I can successfully tune to a channel using
"czap -c channels.conf '<name_of_channel>'" and after a few iterations
I hear the audio part of the channel I just tuned in, so I guess most
of my hardware is working.

I used channels.conf-import.pl to attach audio and video IDs to the
channels set up by tv_grab and mythfilldatabase --manual. It appears
that that is not sufficient.

Trying to get a fix on the problem, I tried piping the mpeg stream to
mplayer using "dvbstream -o -ps -f xxxxx -s xxxxx -qam xx | mplayer
-", which quit because the cache would fill as nothing was piped to
mplayer.

A closer look at the output of dvbstream without the piping yielded 

dvbstream -o -ps -analyse -s 6875000 -f 410000000 -qam 64 255 256
dvbstream v0.5 - (C) Dave Chapman 2001-2004
Released under the GPL.
Latest version available from http://www.linuxstb.org/
Using DVB card "VES1820 based DVB-C frontend"
tuning DVB-C to 1978106880, srate=-1714934592
polling....
Getting frontend event
FE_STATUS:
polling....
FE_STATUS:
polling....
FE_STATUS:
polling....
FE_STATUS:
polling....
FE_STATUS:
polling....
FE_STATUS:
................. and so on and so on and so on....


The output of czap on the same channel gives me this (along with audio
through the line in):

czap -c channels.conf "SAT.1-CH"
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
reading channels from file 'channels.conf'
 30 SAT.1-CH:410000000:INVERSION_AUTO:6875000:FEC_NONE:QAM_64:255:256:48
 30 SAT.1-CH: f 410000000, s 6875000, i 2, fec 0, qam 3, v 0xff, a 0x100
status 07 | signal 8d8d | snr d8d8 | ber 009ffff6 | unc ffffffff |
status 1f | signal ffff | snr eded | ber 009ffff6 | unc ffffffff | FE_HAS_LOCK
status 1f | signal ffff | snr eded | ber 009ffff6 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ffff | snr eeee | ber 0005b5a4 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ffff | snr eeee | ber 0005b5a4 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ffff | snr eded | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ffff | snr eded | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ffff | snr eeee | ber 00000000 | unc 00000000 | FE_HAS_LOCK
status 1f | signal ffff | snr eded | ber 00000000 | unc 00000000 | FE_HAS_LOCK
.................... and so on .....


It seems that czap is doing something differently as it manages to get
a proper lock on the channel. Needless to say that I have so far not
managed to get mythfrontend to give me liveTV on said channels. The
logfile says:

Resetting slot 0...ok.
Resetting slot 1...ok.
2004-10-12 22:23:18 DVB#0 CAM - Initialized successfully.
2004-10-12 22:23:18 DVB#0 ERROR - Could not find dvb tuning parameters for chann
el  with id 1.
2004-10-12 22:23:18 DVB#0 ERROR - Failed to get channel options for channel .
2004-10-12 22:23:18 DVB#0 Recorder: Card opened successfully.
2004-10-12 22:23:18 DVB#0 ERROR - No PIDS set, please correct your channel setup
.
2004-10-12 22:23:19 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:20 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:21 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:22 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:23 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:24 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:25 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:26 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:27 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:28 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:29 DVB#0 WARNING - No data from card in 1 second.
2004-10-12 22:23:30 DVB#0 WARNING - No data from card in 1 second.


What worries me is the line "ERROR - No PIDS set". I have the numbers
from channels.conf in the channel editor, what more can I do?

Does anybody have an idea what I'm missing here? Thanks in advance for any help!

Best regards,
Albert.


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