[mythtv-users] Right then....how to tell recording to start xxx minutes in rather then at beginning?

[Another Sillyname]

The BBC are now showing the Olympics in a glorious 8 channel Red
Button festival....I won't sleep for a month!!!!

However I'll explain for non UK based users.

The BBC Red Button service in effect turns digital channels on and off
as required so if a certain Olympics event is due to start at say
14:00 the programming will start at say 13:45 and the channel will go
live literally maybe a minute before the programming starts.

In SD this hasn't usually created a problem.

However in HD when you try to playback the recording has started
early.....the HD decoder tries to play the file and borks (as the
channel probably hasn't 'turned on' when the recording started), if
you play the file with VLC it's fine...so it's there.

I suspect that myth is looking for video info at the start of playback
to decide what decode mode it needs to go into and when there isn't
any it segfaults.

So how can I tell myth to start playback say 4 minutes into a recording?

I can't change the recording rules...there's far far to many
recordings to want to mess around with (unless I can setup a rule such
as "If this recording is on 'BBC RB HD' then start recording 5 minutes
later then normal).

Thanks