[mythtv-users] How do you "tune" subchannels in QAM?

[Adam Gianola]

maybe better in mythtvsetup to set the options on the hd3000 dvb to
record in ts mode instead of ps mode.  i did this and it seems to be
working ok.  going to test out a recording, as I really don't plan on
watching livetv with this setup, so we'll have to see how it works
out.
-AG

On Thu, 31 Mar 2005 20:55:43 -0500, Marc Tousignant
<drayson at net1plus.com> wrote:
> >Have you been able to successfully tune the frequencies using azap? (get
> >the instructions for installing it here:
> >http://www.rsmas.miami.edu/personal/angel/mythtv/air2pc-howto.html)
> >
> >You might try just getting your card to successfully tune the channels,
> >and as a worst case scenario, use the frequencies reported by azap for
> >your channels in the DVB Transports section of the MythTV configuration.
> >
> >But first, just to rule out problems with your driver setup, you need to
> >make sure azap works.
> 
> John
> 
> Azap works to tune channels and Dvbscan confirms there are subchannels
> 
> yggdrasil root # azap -c /root/channels.conf-qam-correct -r c82
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 573000000 Hz
> video pid 0x0000, audio pid 0x0000
> status 1f | signal 0977 | snr fded | ber 00000000 | unc 00000000 |
> FE_HAS_LOCK
> status 1f | signal 0977 | snr fdd5 | ber 00000000 | unc 00000000 |
> FE_HAS_LOCK
> status 1f | signal 0977 | snr fded | ber 00000000 | unc 00000000 |
> FE_HAS_LOCK
> 
> yggdrasil root # dvbscan -cvvv
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> parse_section:981: pid 0x00 tid 0x00 table_id_ext 0x80b6, 0/0 (version 2)
> PAT
> parse_section:981: pid 0x30 tid 0x02 table_id_ext 0x0001, 0/0 (version 4)
> PMT 0x0030 for service 0x0001
>   VIDEO     : PID 0x0800
>   OTHER     : PID 0x0801 TYPE 0x81
>   OTHER     : PID 0x0802 TYPE 0x81
> parse_pmt:798: 0x0000 0x0001: (null) -- (null), pmt_pid 0x0030, vpid 0x0800,
> apid 0x0000 ()
> parse_section:981: pid 0x31 tid 0x02 table_id_ext 0x0002, 0/0 (version 26)
> PMT 0x0031 for service 0x0002
>   VIDEO     : PID 0x0840
>   OTHER     : PID 0x0841 TYPE 0x81
> parse_pmt:798: 0x0000 0x0002: (null) -- (null), pmt_pid 0x0031, vpid 0x0840,
> apid 0x0000 ()
> WARNING: filter timeout pid 0x0011
> dumping lists (2 services)
> [0001]                   (0x0001) 00: PCR == V   V 0x0800
> [0002]                   (0x0002) 00: PCR == V   V 0x0840
> Done.
> 
> Dvbstream broadcasts the TS over the network so I can watch it live with
> VideoLAN
> yggdrasil root # ./dvbstream/dvbstream -v -qam 256 -f 573000000 -c 0 8192
> dvbstream v0.6 - (C) Dave Chapman 2001-2004
> Released under the GPL.
> Latest version available from http://www.linuxstb.org/
> Tuning to 573000000 Hz
> Using DVB card "pcHDTV HD3000 HDTV", freq=573000000
> tuning ATSC to 573000000, modulation=5
> Getting frontend status
> Bit error rate: 0
> Signal strength: 916
> SNR: 64981
> UNC: 0
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI
> FE_HAS_SYNC
> dvbstream will stop after -1 seconds (71582788 minutes)
> Using 224.0.1.2:5004:2
> version=2
> Streaming 1 stream
> 
> >AACK!
> >
> >You shouldn't have to do this! Please make sure your card is configured
> >correctly.. (see my previous post) Channel scanning should work just
> >fine, and put all of the appropriate entries in your channels lineup. If
> >it doesn't, something else is probably wrong.
> 
> It's the only way I can get myth to agree with me that there is something
> coming in on my card.
> The channel scan myth performs locks on all the right channels but reports
> timed out while tuning.
> 
> You got any better ideas I'm open to trying.
> 
> Got home and tried the channel I setup. It plays.. Kinda.. it's almost as if
> something within mythtv itself is interfering with the signal or hampering
> playback. I get massive pixelization and the audio skips so much you can't
> hear anything understandable.
> 
> Feeding from dvbstream to videolan works flawlessly through my network.
> Both my myth system (yggdrasil) and my gaming system (nidheg) are P4
> 3.40GHz's with GeForce FX 5700LE's
> The key differences between them are; nidheg has an audigy card and 1 gig
> ram and yggdrasil has the capture cards, PVR-350 and HD3000, and 512 meg
> ram.
> Ya overkill but yggdrasil is intended to be front/back and a transcoder with
> all intentions of lasting a long time.
> 
> Marc
> 
> 
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