[mythtv-users] Playback of recordings from C4HD slow to start

[Robert Longbottom]

On 11 Dec 2012, at 12:52 PM, John Pilkington <J.Pilk at tesco.net> wrote:

> On 11/12/12 11:11, Paul Gardiner wrote:
>> On 10/12/2012 15:52, Robert Longbottom wrote:
>> > On 10 Dec 2012, at 02:46 PM, Tim Draper <veehexx at gmail.com
>> > <mailto:veehexx at gmail.com>> wrote:
>> >>
>> >> On 9 December 2012 16:26, Robert Longbottom <rongblor at googlemail.com
>> >> <mailto:rongblor at googlemail.com>> wrote:
>> >>     Is anyone else seeing this?  I've been seeing it for a while now,
>> >>     but have only just gotten round to looking into it.
>> >>
>> >>     I'm running MythTV 0.25.2 on Gentoo.  I have a master backend and
>> >>     a remote frontend.
>> >> I've noticed this also. I'm on 0.26 with split BE & FEs.
>> >> i'll give it another check when i get home (if i remember). i did a
>> >> full rescan a week or 2 ago to fix some EIT issues i was experiencing.
>> >> i dont recalling having the issue since then.
>> >> Looks like i have a couple of recordings of C4HD content to check
>> >> with, both pre and post re-scan.
>> >
>> > Ah, interesting. Let me know what you find out. If I just need to rescan
>> > C4HD that would be a good result. I hardly ever rescan so that could
>> > certainly be an issue for me.
>> 
>> I've always assumed it was because C4HD transmissions have very
>> infrequent I-frames. I think mythtv waits for one before starting
>> playback. I've been meaning to take a look sometime.
>> 
>> One slight flaw in that thought is that you'd expect to be lucky
>> on occasion and start just before an I-frame so it should start
>> quickly on occasion.
>> 
>> Cheers,
>>     Paul.
> 
> Recording options in mythtvsetup allows 'Wait for SEQ start', which might help if that /is/ the problem - and if it does what I think it means...
> 

Hmm, I've always assumed that only affects recording, not playback. But I'll have a look and see what it's set to. 

Rob.