[MPlayer-dev-eng] Ac3 streams detected as LPCM or SPU in TS

[Nico Sabbi]

MichaelM wrote:

> I've noticed that with a verbose dump of dvbscan, pmt information is 
> available, with a pmt for each service offered. How is it that some 
> cards offer pmt through mplayer, yet others (such as mine ...) cannot, 
> despite the fact that its available?


every card "offers" it: it's always available, just grab it.
To grab it you need to tell the driver to include the relative pid in 
the final TS, but also pid 0
(containing the PAT) in order to have the demuxer know where the PMT is.


>
> Since dvbscan can find the pmt's pid, is there harm in using a similar 
> approach in mplayer (or even xine)? A quick read through the code 
> shows that there's no place for the pmt pid in the dvb input, only the 
> ts demuxer makes any reference to the pmt. Also, I'd imagine scanning 
> for the pmt would be somewhat slow.
>
you don't need anything else in the dvb code

> Most of the networks i've found follow a similar pattern for the 
> pmt_pid (ranging from 0x0100 -> 0x0101 etc), with one network not 
> following the trend.


> Just for the hell of it, could I hardcode the pmt_pid in mplayer, just 
> to see if it works? My qualm would be where to hardcode, and will it 
> be futile if by the time the stream reaches the demuxer, there is no 
> pmt (streams caught with dvbstream don't seem to have pmt).


no hacks, please. As I wrote above you also need to know where the pmt 
is (pmt_pid) and for that you need the PAT content
Please, have patience: I already modified the demuxer to recognize those 
fancy AC3 streams without the PMT, as J. C. Dutton suggested.
The code is almost working, but I stumbled on a bug that I haven't fixed 
yet.
When the code is 100% working I will commit it, then I will modify the 
dvb code as I explained earlier.


>
> Nico Sabbi wrote:
>
>>
>> software only: in channels.conf you don't have a way to indicate what 
>> pid contains the PMT;
>> I can easily solve it adding always pid 0 (that gives the PMT) in the 
>> filters and you can add +<pmt_pid>
>> in one of video/audio fields (as scan indicates extra streams)
>>
>
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