Re: [Redbutton-devel] Problem after retuning with Freesat

[Simon K. <s.k...@er...>]

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On 28/02/11 20:16, John Williams wrote:
> On Mon, 28 Feb 2011 12:44:45 +0000
> Simon Kilvington <s.k...@er...> wrote:
> 
>> just got a quick question - I don't have access to FreeSat, so I can't
>> test this, but what happens to the video stream when the channel
>> changes with your patch? Does the video carry on playing?
> 
> No. In fact the new channel is on a completely different transponder
> (12.441GHz instead of 10.773GHz), it has a different SID, different
> VPID and APID etc etc. The video just freezes.
> 
> The spec says "any prepared MHEG-5 Stream objects shall be re-evaluated
> according to the context of the new service as if a SetData action had
> occurred". I would *guess* that this means that, if it was playing the
> default video/audio for the service before the tune, it should start
> playing the video/audio of the new service after the tune. This would
> require some code to change the PES filters to the new VPID and APID,
> which doesn't exist at the moment. Also, I think I've sometimes
> seem a StreamClass SetData action, which isn't implemented: perhaps
> this is setting some details of the new service?
> 
> If I navigate to the menu option that takes me back to the original
> program on BBC1, then the video comes back to life again. So the PES
> filters must still be working OK, they are just filtering the wrong PIDs
> for the new service.
> 

I've just committed a patch that should (hopefully) allow the video to
continue running when it changes channel - can you give it a try?

it only handles the case when SetData is called explicitly, so it should
work on this example, but I need to do an implicit SetData call when we
do a non-destructive retune - if this works, I'll add that in...

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