[mythtv-users] multi-camera TV recordings?

[Mike Perkins]

On 20/06/15 22:30, John Pilkington wrote:
> On 17/06/15 13:37, Andre Newman wrote:
>>
>> On 16 Jun 2015, at 22:45, José Oliver Segura <primijos at gmail.com> wrote:
>>
>>> Hi all,
>>>
>>> Does anybody know if it's possible to record and play files with more than
>>> one video stream in them?
>>>
>>> I'm trying to figure out how to record and play "multi-camera" shows (mainly
>>> sports/motor events). I receive them via IPTV, each camera has its own
>>> multicast address and I've done some experiments in order to use avconv + the
>>> external recorder option (through a custom script) available in mythtv to
>>> make all those independent channels look like a single channel with multiple
>>> video streams in it.
>>>
>>> The problem is that the final step would be to be able to cycle among those
>>> video streams when playing back the recorded file, but I can't find any
>>> information about whether tha'ts possible or not in mythtv. I know
>>> dvd/blueray playback has some sort of multi-angle support, but I can't find
>>> nothing similar regarding recorded TV.
>>
>> I’ve used VLC for playback of full transport streams, they can have many
>> channels within the same file. VLC allows you to select which channel to watch
>> by name, even decodes subtitles and multiple audio streams. I’ve never found a
>> way to do this with the same file in MythTV.
>>
>> I do have some multi angle DVDs, I just tried one from an iso file and there’s
>> an angle menu which allows selection of the four video angles, maybe you could
>> mux together the video streams in the same way a multi angle dvd does? Maybe
>> ffmpeg can be persuaded to do this?
>>
>> I just tried a transport stream with several video channels in it and MythTV
>> just plays the first one and there’s no select video stream menu like the
>> select audio one.
>>
>> Andre
>>
>>
>>>
>>> Any hint?
>>>
>>> Best,
>>> Jose
>
> I thought this query rang a bell but I didn't at the time find out where.  Just
> came across an option in master in
>
> Backend setup > Recording Profiles > Hardware DVB Encoders > Default > Normal >
> Record Full .ts
>
> "If set, extra files will be created for each recording with the name of the
> recording followed by .ts.raw.  These extra files represent the full contents of
> the transport stream used to generate the recording.
> (For debugging purposes.)"
>
> I haven't tried this and I can't say how it might fit into the OP's scenario. I
> suppose one could set up a non-default profile and a new recording rule.
>
> It sounds as if this could provide a way of bypassing the fairly arbitrary limit
> on the number of virtual tuners per physical DVB tuner, but without the
> scheduling and metadata facilities, and at the cost of extra post-processing.
>
Well, the obvious next step to me is to use that .ts to drive a "video wall". It 
seems to me that dividing the screen up into 4, 9 or 16 and using a similar 
method to picture-in-picture could accomplish this.

-- 

Mike Perkins