[linux-dvb] Re: continuity counter

["Harald Dankworth" <Harald@Pronto.TV>]

> -----Original Message-----
> From: Harald Dankworth
> Sent: 14. april 2003 15:56
> To: linux-dvb@linuxtv.org
> Subject: [linux-dvb] continuity counter
> 
> Hi,
> 
> I have made small application which tunes into a transponder frequency,
> using a technotrend dvb-s budget card and the most recent dvb driver from
> cvs. I read the filtered stream from dvr.
> 
> I have some problems with the continuity counter of the mpeg-2 transport
> stream packets. There seems to be some packets missing every 1-5 seconds,
> even though the bit error rate is zero. I have tried to filter just pid
> 0x2000 to get the entire multi-program transport stream, but the same
> happens then. I am reading 512*188 bytes from vdr each time. The error
> seems to occur at random packets within this chunk. I have tried different
> transponders with the same result; I doubt that e.g. the bbc world mpeg-2
> tranport stream from the satellite is incorrect. I have checked that the
> adaption_field_control is not equal to '00' or '10', and that the
> discontinuity_indicator of the adaption field is not equal to 1. According
> to the transport stream syntax the continuity counter should be continuous
> then, which is not true for all packets in my case. Because of this the
> playback is choppy.
> 
> I am running a Pentium 4 CPU at 1.8 GHz.
> 
> Does anybody have an idea what might be wrong?
> 

After some debugging of the driver I have narrowed the problem: the packets are already lost in the buffer sent from vpeirq(), in av7110.c, to 
dvb_dmx_swfilter_packets(), in dvb_demux.c.

Harald

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