[mythtv-users] Setting up SA3250HD and FireWire

jacob jacob at heider.homelinux.net
Fri Jun 16 21:40:47 UTC 2006

Ok, maybe something very obvious is eluding me, but I cannot get my SA3250HD
to work reliably, with Myth or test-mpeg2. The work I've done so far amounts

Plug in FireWire connections on the box and computer. plugreport gives:

Host Adapter 0

Node 0 GUID 0x001692180d260000
oMPR n_plugs=1, data_rate=2, bcast_channel=63
oPCR[0] online=1, bcast_connection=0, n_p2p_connections=0
        channel=0, data_rate=2, overhead_id=0, payload=146
iMPR n_plugs=0, data_rate=2

Node 1 GUID 0x0001080038030803
libiec61883 error: error reading oMPR
libiec61883 error: error reading iMPR

    On the advice of my readings, I do 

plugctl -n 0 oPCR[0].n_p2p_connections=1

to setup p2p communication. I patched sa3250ch to use my vendor and device
identifiers, as well as modifying the CTL_CMD1 calculation to use chn << 8.
I've gotten it to come up once, exactly, and spit video, but attempting to
change the channel blew it out of the water, and I haven't been able to get
it that far again. Whenever I try and use it in Myth, I get strings of

2006-06-15 19:53:36.808
RingBuf(/mnt/video/mythtv/recordings/1012_20060615195330.mpg): Invalid file
(fd 20) when opening '/mnt/video/mythtv/recordings/1012_20060615195330.mpg'.
0 retries remaining.

followed by strings of

2006-06-15 19:53:37.483
RingBuf(/mnt/video/mythtv/recordings/1012_20060615195330.mpg) Error: Invalid
file descriptor in 'safe_read()'

both of which haven't been particularly illuminating via google. Myth
supports the SA3250HD, so either it's completely fragile (mostly broken), or
I'm missing something. I'm currently using Christian Marillat's packages for
Debian/Sid i386, although I tried the SVN trunk with no more success. It's
possible my problems stem from trying to tune 5C channels, in which case I'd
be interested in people's methods for setting up their channel lists to
exclude them. If someone has a working 3250 FireWire setup, I'd be very
interested in how they got it set up. If I can get this working, I'll
definitely add it to the Wiki.



More information about the mythtv-users mailing list