dvbbasebin questions

Tony Houghton h at realh.co.uk
Wed Mar 16 07:09:05 PDT 2011

On Wed, 16 Mar 2011 00:13:31 +0000
Tony Houghton <h at realh.co.uk> wrote:

> I wrote a small test program in python, based on what I learnt from
> the dvbscan.c code; I've attached it. The mpegtsparse element doesn't
> seem to be working at all; the only ELEMENT messages I'm getting are
> dvb-adapter and dvb-frontend-stats which I think come from dvbsrc, not
> mpegtsparse. And mpegtsparse doesn't create any pads. If I don't
> include the extra video/audio pids as well as the SI pids I get a
> dvb-read-failure ELEMENT message.

I spotted my own mistake, I only set the dvbsource to STATE_PLAYING
instead of the pipeline. It's working now. I still get the
dvb-read-failure messages if I only include SI pids but it seems
harmless and I get the section messages OK.

I'm still puzzled by the other two issues though:

> Another oddity is that I originally used
> set_properties("adapter", adapter, "frontend", frontend) instead of a
> separate set_property for each property, but it didn't work. The
> adapter number stayed 0 after I had set it to 1 (also if I reordered
> the properties so adapter came after frontend).
> Also, why is the "pids" property write-only? In a complex application
> it would be nice to know what the pids already are to make sure
> different functions don't conflict with each other.

The most useful aspect of being able to read pids would be so that I
could use a dvbbasebin to stream or record a programme and add EIT pids
to its child dvbsrc to "harvest" the EPG at the same time.

Or is it possible to use two dvbsrc elements on the same adapter and
frontend simultaneously?

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