Hi all,
I've been running a split FE/BE Mythtv setup with minimal issues
almost for a year now. On the BE I'm using a HVR-1600 to receive OTA HD via
the ATSC input from a roof mounted antenna. The issue has been that on some
channel, and some channels only I've been getting what appears to be
interlacing/combing effects. I have an example of this effect from the
capture here on start of 60 minutes on CBS (4_2 KPIX-DT in the Bay Area).
The effect is very pronounced during horizontal motion involving
particularly vertical features in the picture.
http://thinkspace.ath.cx/stuff/vlcsnap-2017280.png
The effect is present independent of the player, whether it's on the
Mimimyth FE I normally use, XBMC or VCL on my PC in this case, hence I put
it down to a reception/BE issue regarding the OTA signal quality reception
for these stations. Keep in mind it only happens only on some specific 4-6
OTA channels, Fox (2_1 KTVU-DT) for an example using the same setup is
razor sharp with no such artifacts. Similarly the next higher channel from
CBS, 7_1 (ABC) is razor sharp, but 9_1 has the issue, 11_1 is sharp etc, it
may be alternating but I'm not exactly sure.
I initially put this issue down to a reception/signal quality problem as my
antenna was quite old and a combined VHF/UHF old style design. So recently
I decided to get serious about solving this issue and installed a brand new
DB4 UHF antenna pointed more or less in the direction of the transmission
tower. But still the problem persists. The thing is both CBS (5_1) and
NBC(11_1) are 304-321 degrees orientation and roughly the same distance of
21-25 miles from my place, but NBC doesn't seem to have the issue. Hence it
does not seem to be reception related.
Following this I updated the cx18 driver to a more recent 1.2.0 version and
rescanned all the channel, but no progress. I'm kind of stumped, anyone have
any idea what may be the source of the interlacing issue on the BE?
Many thanks,
Tony
I've been running a split FE/BE Mythtv setup with minimal issues
almost for a year now. On the BE I'm using a HVR-1600 to receive OTA HD via
the ATSC input from a roof mounted antenna. The issue has been that on some
channel, and some channels only I've been getting what appears to be
interlacing/combing effects. I have an example of this effect from the
capture here on start of 60 minutes on CBS (4_2 KPIX-DT in the Bay Area).
The effect is very pronounced during horizontal motion involving
particularly vertical features in the picture.
http://thinkspace.ath.cx/stuff/vlcsnap-2017280.png
The effect is present independent of the player, whether it's on the
Mimimyth FE I normally use, XBMC or VCL on my PC in this case, hence I put
it down to a reception/BE issue regarding the OTA signal quality reception
for these stations. Keep in mind it only happens only on some specific 4-6
OTA channels, Fox (2_1 KTVU-DT) for an example using the same setup is
razor sharp with no such artifacts. Similarly the next higher channel from
CBS, 7_1 (ABC) is razor sharp, but 9_1 has the issue, 11_1 is sharp etc, it
may be alternating but I'm not exactly sure.
I initially put this issue down to a reception/signal quality problem as my
antenna was quite old and a combined VHF/UHF old style design. So recently
I decided to get serious about solving this issue and installed a brand new
DB4 UHF antenna pointed more or less in the direction of the transmission
tower. But still the problem persists. The thing is both CBS (5_1) and
NBC(11_1) are 304-321 degrees orientation and roughly the same distance of
21-25 miles from my place, but NBC doesn't seem to have the issue. Hence it
does not seem to be reception related.
Following this I updated the cx18 driver to a more recent 1.2.0 version and
rescanned all the channel, but no progress. I'm kind of stumped, anyone have
any idea what may be the source of the interlacing issue on the BE?
Many thanks,
Tony