[mythtv] DVB drivers

Mark Howells Mark.Howells at softoption.com
Fri Jul 9 12:40:34 EDT 2004

> -----Original Message-----
> From: Ed Wildgoose [mailto:lists at wildgooses.com] 
> Sent: 09 July 2004 16:20
> To: Development of mythtv
> Subject: Re: [mythtv] DVB drivers
> > After myth tunes the card and adds the PID filters for audio and
> > video,  the card sends data for both PIDs.  However, in 
> > libmythtv/dvddev/transform.c get_vinfo() checks for the 
> bytes sequence 
> > 0x00, 0x00, 0x01, 0xb3 (which I presume is some kind of sequence 
> > header).  It never gets this from the card and consequently 
> the video 
> > PID is never remuxed into the stream.
> It is a header, and things are bad if the card never generates one.
> Have you tried dumping the stream to disk and then hexdump it 
> to check 
> for these codes?  ie tune the card and then cat 
> /dev/dvb/adaptor0/dvr0 > 
> somefile and hexdump this file

Hmm, did this (tuned with tzap from one xterm and ran cat /dev/dvb/adaptor0/dvr0 > datafile in another) and get a zero length file - no data.  Frontend stays locked with snr:fefe signal:cece and ber:00000000.

However, the card works if I tune the card with tzap and then run dvbstream | mplayer ...

Is this a clue - I guess I can start pulling dvbstream apart to see how it works... :(


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