[mythtv-users] Seeking back through live TV buffers very hit and miss

Robin Gilks g8ecj at gilks.org
Mon Apr 16 10:40:49 UTC 2007


> Hi all,
> I have a problem which has probably been around since the switch to
> separate program buffer files for each program watched in live TV
> rather than a single buffer file.
>
> I'm using DVB-T in the UK, so all my recordings are mpeg2.
>
> Basically, if I seek back through live TV the frontend very often gets
> 'stuck' at program boundaries. Sometimes it will sit for 30 seconds or
> more at the start of the program buffer and then if I am lucky it will
> jump back to the *start* of the previous program, but more often it
> will just give up and leave itself where it was in the current buffer.
> It's extremely irritating when this happens as it's usually when the
> kids are watching Cbeebies which has loads of 5-10 minute programs so
> there are a lot of Live TV buffer files kicking around and it's almost
> guaranteed that I will need to cross a boundary if they want to watch
> something again.
>
> Any ideas what's going on? Is it a seektable problem? I noticed the
> other day when I moved a Live TV program into my standard recording
> group to keep it that it did not have any seektable info with it -
> either it was lost during the group move or it was never created at
> all. Is there supposed to be seektable info for live TV files?
>
> I'm running a fairly up-to-date 0.20-fixes svn with a few patches
> applied from the trunk where I figured they might fix the issue, but
> no joy so far.
>
> Is anyone else seeing this at all? I guess it's probably visible to
> anyone using Live TV and recording mpeg2 video if other people are
> affected...?
>
> --
> Neil Milne


I get this on my SP13000 Epia frontend but not on my 2700XP+ CPU with
nvidia card. In the past I've put it down to something to do with the
Unichrome/Openchrome video driver (restricted number of surfaces?) so I
wonder what your hardware is?

Also, are you using fast rewind (i.e. go backwards at speed) or jump
backwards (my jump keys are programmed up to 8 seconds back, 30 forward).
Just trying to collect more data points...

-- 
Robin Gilks



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