[mythtv-users] pcHDTV signal strength issue
david at thegeorges.us
Tue Jun 29 21:10:00 EDT 2004
I just finished getting my pcHDTV and PVR-250 MCE playing happy together.
The well known minor number conflict with a bttv card (ie. pcHDTV) is now
fixed. I sent a patch to the ivtv driver list which is now included in
ck97j and higher.
Anyway, my problem is when I set MythTV to record from an ATSC channel I
get 0 length recordings. When I look in the backend log I see the
2004-06-29 20:00:02 Started recording "Navy NCIS" on channel: 1007 on
cardid: 1, sourceid 1
VIDIOC_S_STD: Invalid argument
2004-06-29 20:00:05 Maximum signal strength detected: 13% after 5500 msec
2004-06-29 20:00:05 Changing from None to RecordingOnly
2004-06-29 20:00:08 Maximum signal strength detected: 13% after 5500 msec
2004-06-29 20:00:08 Signal level too low?
2004-06-29 20:00:08 Tuning Error -- aborting recording
The capture card is setup as pcHDTV ATSC capture card with Default input
Antenna-0. TV format in backend global settings is set to ATSC.
I also went into the channel editor and changed the freqid as per messages
I found in the pcHDTV forum and in the Myth mailing list. I got kinda
conflicting info on what to use for the freqid. For example in
Charleston, CBS broadcasts NTSC on channel 5 and ATSC on channel 47. I
tried putting 47 in the freqid, but then found other messages that seemed
to imply that the freqid field should be 5-1. I have tried both and get
the same 13% signal strength. This is on a channel that dtvsignal says is
I am running FC2 with kernel.org 2.6.7 with kraxel v4l2 and pcHDTV
patches. I am running MythTV CVS as of maybe 2 days ago.
I only have the pcHDTV card configured in myth currently. I am waiting
until I get everything setup and tested before adding the ivtv card to
Thanks for any pointers.
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