[mythtv-users] Wrong Channel when recording?

[Hika van den Hoven]

Hoi Mike,

Thursday, May 14, 2015, 11:17:35 AM, you wrote:

> On 13/05/15 23:25, John Pilkington wrote:
>> On 13/05/15 22:51, Hika van den Hoven wrote:
>>> Hoi Eric,
>>>
>>> Wednesday, May 13, 2015, 11:25:55 PM, you wrote:
>>>
>>>> On Wed, May 13, 2015 at 5:02 PM, Hika van den Hoven <hikavdh at gmail.com> wrote:
>>>>> I did some checking and I can't find a way to set a channel as HD or
>>>>> SD. Only individual programs can be marked as HD by your grabber.
>>>
>>>> That's right.
>>>
>>>>> Which is weird. Why then that filter. and isn't everything on a
>>>>> channel either SD or HD?
>>>
>>>> Not exactly.  An "HD" channel may broadcast in 1080i content that was
>>>> upscaled from 480i.  Is that content HD or SD?  The listing (if
>>>> correct) should list that program as SD even if it's on an "HD"
>>>> channel.  The idea is that MythTV should be able to record SD
>>>> broadcasts of SD content and do its own upscaling (if needed), but my
>>>> experience has been that the listings are horribly inaccurate to the
>>>> point of uselessness wrt determining which programs are actually HD.
>>>> This was why I deleted all of the SD channels.  Too many listings
>>>> listed HD programs as not-HD.
>>>
>>>> Eric
>>>> _______________________________________________
>>>
>>> So, for the filter to work, you need different listings for the two
>>> channels: For the HD channel with the <video><HD> tag's where
>>> appropriate and without the tags for the SD channel.
>>>
>>> It would be nice if you could tag a channel as HD or SD and that
>>> mythfilldatabase would ignore the HD tags for an SD channel! I'm now
>>> thinking of a way to handle this in my grabber.
>>
>> Is this another instance of the need to switch some recent device drivers
>> explicitly for HD or SD?  AIUI myth doesn't at present do that - see #12342.  I
>> think I would expect an attempt to record HD without such a switch to fail
>> because the PIDs were wrong, but...
>>
> Switching from SD to HD is a bit more fundamental than that, at least in the UK.
> Scanning with my SD USB tuners doesn't even recognise the existence of the HD
> multiplex.

> I'm guessing the drivers have to switch to a whole different tuning mode to
> change between SD and HD and it is this that is currently not happening correctly.

> Just sending a command "Tune to multiplex x, subchannel y" works between
> channels that are all SD, or all HD, but a little extra is needed changing
> transmission protocols - and recognising that you need to do so.

If so, how does MythTV know? There is nothing in the db to indicate
wether a channel is HD, SD or radio. And here they are all mixed
together. I guess in my case, since I have a HDhomerun, the tuning is
done by the HDhomerun and MythTV can just sample the stream, but how
with a pci-e or usb tuner?


Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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