[mythtv-users] Problems with DVB-C Streams: Audio and Video Playback
Rho
rho at thinkingspot.ch
Thu Feb 14 07:44:20 UTC 2008
Hello
I've upgraded my MythTV system (running SVN trunk, revision 15947) with
a DVB-C card, and after some minor installation problems (mainly kernel
related), I was finally able to tune channels and play with mplayer and
record streams.
I quickly started MythTV and imported my channels.conf, switched on the
TV, but the picture/audio is getting quite a hiccup after a few seconds
- I've got glitches in the MPEG stream, audio dropping out from now and
then ... the log shows a lot of "TeletextDecoder: No Teletext Viewer
defined!", which i deem not problematic, a few "VBI: Unknown descriptor:
<xxx>" and later on a few messages coming from ffmpeg like "mpeg2video"
"MPEG motion vector out of boundary", "slice mismatch" and (exemplary)
"concealing 387 DC, 387 AC, 387 MV errors".
I've spent a few hours trying to find out what's going wrong, with not
much luck until now.
As a resumee:
- created channels.conf with w_scan [1]
- tuned channels using czap and the channels.conf created above
- played dvb-stream using mplayer with absolutely no problems, even HD
streams
- made a few futile efforts scanning for channels in MythTV and
eventually imported channels.conf created above
- checked database for (hopefully) correct entries, see extract from
channels.conf [2] and matching entry in the DB [3]
- switched playback using libmpeg and ffmpeg, with different deint's
everything to no avail ... is there anybody having similar problems? Any
hints on where I should have a closer look?
Best regards
Rho
[1] http://wirbel.htpc-forum.de/w_scan/index2.html
[2] channels.conf:
SF1(GAG):386000000:INVERSION_AUTO:6900000:FEC_NONE:QAM_256:1011:1012:1010
[3] mythconverg DB entries for channel SF1:
<mythconverg>
<!--
SELECT * FROM channel JOIN dtv_multiplex ON (channel.mplexid =
dtv_multiplex.mplexid ) WHERE callsign = "SF1"
-->
<channel>
<chanid>5010</chanid>
<channum>1010</channum>
<sourceid>4</sourceid>
<callsign>SF1</callsign>
<name>SF1</name>
<icon></icon>
<videofilters></videofilters>
<xmltvid></xmltvid>
<recpriority>0</recpriority>
<contrast>32768</contrast>
<brightness>32768</brightness>
<colour>32768</colour>
<hue>32768</hue>
<tvformat>Default</tvformat>
<commfree>0</commfree>
<visible>1</visible>
<outputfilters></outputfilters>
<useonairguide>0</useonairguide>
<mplexid>32</mplexid>
<serviceid>1010</serviceid>
<tmoffset>0</tmoffset>
<atsc_major_chan>0</atsc_major_chan>
<atsc_minor_chan>0</atsc_minor_chan>
<last_record>0000-00-00 00:00:00</last_record>
<default_authority></default_authority>
<commmethod>-1</commmethod>
<mplexid>32</mplexid>
<sourceid>4</sourceid>
<transportid>1</transportid>
<networkid>1</networkid>
<frequency>386000000</frequency>
<inversion>a</inversion>
<symbolrate>6900000</symbolrate>
<fec>none</fec>
<modulation>qam_256</modulation>
<lp_code_rate>auto</lp_code_rate>
<visible>0</visible>
<sistandard>dvb</sistandard>
<serviceversion>20</serviceversion>
<updatetimestamp>2008-02-13 21:59:44</updatetimestamp>
</channel>
</mythconverg>
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