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

[Another Sillyname]

@JohnP

Have you done a rescan on DVB-T since Wednesday last week?

The Beeb put up RB 0 - RB 7 + RB HD + RB 24/7

That's why I called it a Red Button festival.



On 3 August 2016 at 23:50, John Pilkington <J.Pilk at tesco.net> wrote:
> On 03/08/16 23:05, Mike Perkins wrote:
>>
>> On 03/08/16 22:32, John Pilkington wrote:
>>>
>>> On 03/08/16 20:09, Another Sillyname wrote:
>>>>
>>>> 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
>>>
>>>
>>> I'm not sure I recognise the problem - but I normally use SD DVB-T, on
>>> which the RB services appear
>>> as normal EIT-schedulable channels 600 (RB 0) and 601 (RB 1), usually
>>> at 544x576 resolution.
>>> There's also 200 (Red Button), for which I don't see EIT data.  All
>>> these are in the BBC SD mux.
>>>
>>> I don't see RB channels listed in the DVB-T2 HD mux.  mythffprobe on
>>> BBC One HD currently shows two
>>> dsmcc_b data streams with unsupported codecs, using current *buntu
>>> ppa/trusty
>>>
>>> ...but no doubt things are different via HD DVB-S
>>>
>> The problem isn't that the channels are non-scheduleable but that
>> because they come and go there often isn't even a carrier until just
>> before the program begins.
>>
>> This is doubtless difficult for a tuner to cope with. We have this with
>> BBC 4 which starts at 19:00 each evening (though doubtless it will be
>> 24/7 during the Olympics). Because the channel isn't transmitting until
>> just before startup time, it is difficult to record the first program of
>> the evening without taking precautions.
>>
> Yes.  As you said, in SD it's usually possible to get decoding working by
> jumping forward, then creeping backwards.  But I also remember getting
> apparently blank recordings on the part-time kids' channels when the
> recording extended beyond the end-of-service;  haven't tried that recently.
> Some form of transcoding used to fix it.
>
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