[mythtvnz] Seek issues on currently-recording file

[Nick Rout]

On Thu, Aug 27, 2009 at 9:51 PM, Walter Somerville<walter at aaatos.net> wrote:
> On Thu, Aug 27, 2009 at 9:25 PM, Jonathan Hoskin
> <jonathan.hoskin at gmail.com> wrote:
>>
>> I too have always had this issue, since VDPAU started working + 8.10. I work around it by saving my position before seeking, escape out of playback, then hit "play from bookmark", then seeking works. After a few minutes it is no longer accurate however. Otherwise, the down arrow on my remote jumps ahead 10 minutes, which seems to line up with ad-breaks on 3 News, so just starting from the beginning again isn't so hard.
>> Playing back a recording-in-progress seems to set a reference point on the head of the recording from the time you start watching, with any seeks treating this as a fixed end point.
>> Jonathan
>
> That is possible, I guess, but it seems strange that it would do that
> for H264 only (perhaps other digital? any DVB-S users seeing/not
> seeing this?), and only while the file is still being written. I
> haven't looked at the source yet, but I suspect it'll be a bit too
> complicated to get my head around quickly...
>
> Perhaps also of interest would be if anyone is using DVB-T and *not*
> seeing this?
>
> Walter

Mythtv maintains a seektable which it uses for seeking in a recording.
What does the seektable look like when this is happening? Compare the
seektable for a recoding in progress and one that has completed
recording and seeks ok.

In general see here:

http://www.mythtv.org/wiki/Recordedseek_table and
http://www.mythtv.org/wiki/Repairing_the_Seektable

Also you may get more info on the mythtv users list, theres a lot of
knowledge on there, especially in relation to myth's inner workings.