[mythtv-users] specific channel seek issue and acts like poor signal

[Tim Draper]

I've a long standing issue with one of my channels (UK, 4Seven via DVB-S2) where historically the seek will be out. If you play it till the first advert break, then skip forward, then the seek process will jump back a few minutes. almost like the video is playing back faster than a counter that the seek system uses.  AV sync is fine. I've asked about this specific problem maybe a year ago and iirc was sugested to rebuild the seek table but that gave no solution. i think the thread died after that.
However, since i've upgraded to myth30 this channel is also acting like I've weak signal - heavy blocking rendering it almost impossible to watch. mythtv UI doesnt highlight it in yellow to denote a damaged recording.
Problem exists in liveTV as well as recorded.

I figured I'd try to download the file and playback locally via vlc just to see what happens. playback works perfect. no blocking or corruption so the problem seems to be with mythtv specifically. issue only occurs with that channel and all others work perfect.

any ideas on what i could try to fix this specific channel? I've put serious consideration into wiping the DB and starting from scratch with it all just in case there's something bad in the db. If that feeling is true, restores would obviously carry the problem forward. I know the db carrys a number of tables related to channel config so manually cleaning does have a good chance of missing something in the cleanup op and causing further issues.