Channel scanner always deletes existing channels

[Richard <mythtv@…>]

Every time I run a channel scan, it always seems to decide that my existing (working) channels are off-air and wants to delete them. It then re-adds them all wiping out all my xmltv mappings.

Version details:

Please attach all output as a file in bug reports.
MythTV Version   : 26319M
MythTV Branch    : trunk
Network Protocol : 62
Library API      : 0.23.20100913-1
QT Version       : 4.5.3
Options compiled in:
 linux profile using_alsa using_oss using_backend using_bindings_perl using_bindings_python using_dvb using_frontend using_hdhomerun using_hdpvr using_iptv using_ivtv using_joystick_menu using_lirc using_mheg using_opengl_video using_opengl_vsync using_qtdbus using_qtwebkit using_v4l using_x11 using_xrandr using_xv using_xvmc using_xvmc_vld using_xvmcw using_bindings_perl using_bindings_python using_mythtranscode using_opengl using_vdpau using_ffmpeg_threads using_live using_mheg

mythtv-setup -v channelscan,database log attached.

[danielk]

Please provide the contents of the channel and dtv_multiplex tables before the scan, the channelscan, channelscan_channel and channelscan_dtv_multiplex tables after the scan, and two examples of channels that MythTV erroneously wanted to delete.

[Richard <mythtv@…>]

channel and dtv_multiplex tables before the scan

[Richard <mythtv@…>]

channelscan, channelscan_channel and channelscan_dtv_multiplex tables after the scan

[Richard <mythtv@…>]

Pre and post-scan tables attached. As for example channels - it's pretty-much all of them. Try channels 1 (ONE HD) and 2 (ABC1).

My original thought was that there was something amiss with the existing channel data - but the problem occurs on each channel scan even if I clear all channels beforehand.

[danielk]

It appears the problem is that the dtv_multiplex rows in the DB do not have a networkid set and because of this the IsSameChannel?() check in ChannelImporter::CleanupDuplicates?() fails.

[Daniel Kristjansson <danielk@…>]

In 9b8a005c0b5df7378d6db4c54a8cfdd3277fe0c1/mythtv:

Fixes #8983. Allow relaxed matching of channels in DB.

If the user has incomplete channel info in their DB still try
to match them as best as we can to channels found in the scan.