[mythtv-users] Problem recording AC3 from DVB-T

[Stuart Cameron]

I'm in Melbourne, Australia, running MythTV with a DVB-T card. I've been
trying to record SD broadcasts using the AC3 PID (set up in mythtv-setup in
the channel editor). I'm using the "scan" tool to find the correct PIDs,
here's the dump for one channel in particular:

-------------------------------------------------------------
scan -c
using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
Frontend can not do INVERSION_AUTO, trying INVERSION_OFF instead
0x0000 0x0430: pmt_pid 0x0100 Nine Melbourne -- Nine Digital (running)
0x0000 0x0431: pmt_pid 0x0101 Nine Melbourne -- Nine Digital HD (running)
0x0000 0x0432: pmt_pid 0x0102 Nine Melbourne -- Nine Guide (running)
dumping lists (3 services)
Nine Digital             (0x0430) 01: PCR 0x0087 V 0x0207 A 0x02d0 (eng) TT
0x0247 AC3 0x02d1
Nine Digital HD          (0x0431) 01: PCR 0x0080 V 0x0200 TT 0x0240 AC3
0x028a
Nine Guide               (0x0432) 01: PCR 0x0085 V 0x0205 A 0x02bc (eng)
-------------------------------------------------------------

I can record from the standard audio PIDs fine (eg. 0x02d0) and they play
back great either via the offical front-end or the XBox Media Center
frontend I'm running, but if I specify the AC3 PID (0x02d1) the mythbackend
doesn't appear to correctly identify the audio as an AC3 stream. When a
recording starts using the AC3 PID the backends logs this:

-------------------------------------------------------------
2004-06-23 11:10:09 DVB#0 Recorder: Card opened successfully.
Videostream: ASPECT: 16:9  Size = 720x576  FRate: 25 fps  BRate: 10.00
Mbit/s
Audiostream: Layer: 1  BRate: 288 kb/s  Freq: 48.0 kHz

-------------------------------------------------------------

As you can see, it thinks the AC3 stream is still a Layer 1 stream, just
with a higher bit rate than usual. I'm running the released 0.50.1 build,
I've also tried earlier CVS snapshots over the past with the same result.

Any ideas?

Stuart