[linux-dvb] Re: Poll problem with multiple PIDs

[Hugo Van Ruyskensvelde <hugo.van.ruyskensvelde@easynet.be>]

Hi,

I tested your program and I have indeed the same results.
Then I opened only one fd_demux with the same results !!.
There must be something wrong with your program , because I can open up to 8 
fd_demux's with dvbstream.
If I know something more, I let you know.

hugo



On Saturday 15 June 2002 12:25, you wrote:
> I am currently trying to make VDR record multiple channels on the
> same transponder (of a "budget" card) and am having a problem with
> polling the DVR device.
> If somebody could give me a hand here, I would really appreciate it.
>
> Please get the test file
>
>   ftp://ftp.cadsoft.de/pub/people/kls/vdr/x.c
>
> and adjust the line
>
>   int n = 1; // the card index (/dev/ost/demux1)
>
> if necessary to make ot refer to a "budget" card (note that this will
> NOT work with "full featured" cards).
>
> Compile it with
>
>   g++ -I../DVB/ost/include x.c
>
> Now tune your budget card to transponder 12480 on Astra (that's the
> one with Sat.1 and Pro-7). The test program does not do the tuning
> by itself, so you'll need to do this with "tuxzap", "VDR" or some
> other tuning application.
>
> Run the "a.out" program that resulted from the compile and watch the
> output. What happens here is that the program sets up "demuxers" for
> four different channels on the same transponder and reads the data
> delivered by the driver. It then prints the PIDs to give some visual
> feedback. Nothing else is done with the data, so there is no additional
> load from disk access.
>
> When I run the program here, after about three seconds it stops printing
> the PID lines and prints only the dots that surround the "poll()" call.
> Apparently the "poll()" no longer returns POLLIN in pfd.revents.
>
> If I comment out the lines
>
>   SetPid(fd_demuxv4, DMX_PES_OTHER,1791, DMX_OUT_TS_TAP);
>   SetPid(fd_demuxa4, DMX_PES_OTHER,1792, DMX_OUT_TS_TAP);
>
> so that there are only three channels to receive, it works just fine.
> Also, if instead I comment out the "poll()" call, it runs fine.
>
> At this point I come to the conclusion that there must be a problem
> with the "poll" mechanism in the driver. Am I right about this, or
> am I doing something totally wrong here? Or is the driver/card simply
> unable to receive more than three channels?
>
> I am using DVB driver 2002-05-20 (from the CVS), and the card is a
> WinTV NOVA-S.
>
> Any insights would be much appreciated.
>
> Klaus


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