kwkeirstead
Well-known member
I updated to CH recording mode. Problem is I cannot find any specs for this recording mode.
AC160 Firmware 3.07 June 2014 - What is CHRecoding Mode?
- Thread starter kwkeirstead
- Start date
kwkeirstead
Well-known member
The Install procedure requires that you first plug in the AC power - you cannot install using battery.
The final step is tricky
a) remove the SD card (while it shows a steady yellow light),
b) switch off the power (which I took to mean unplugging the power cord),
c) then disconnecting the DC power box that you plugged in,
d) then connecting again or plugging in a battery.
Nowhere in this procedure does it say to switch off the camera which is the usual procedure before you remove an SD card.
It appears DVR devices have a CH mode.
I wonder if CH mode lets you increase the recording speed beyond 21 Mbps (PH mode).
The final step is tricky
a) remove the SD card (while it shows a steady yellow light),
b) switch off the power (which I took to mean unplugging the power cord),
c) then disconnecting the DC power box that you plugged in,
d) then connecting again or plugging in a battery.
Nowhere in this procedure does it say to switch off the camera which is the usual procedure before you remove an SD card.
It appears DVR devices have a CH mode.
I wonder if CH mode lets you increase the recording speed beyond 21 Mbps (PH mode).
kwkeirstead
Well-known member
Hmm.. the camera shows 2 hours recording time on PS (1080/60p) compared to 20 hours on CH (1080/60i)
I see that the frame width for CH is 1440.
I see that the frame width for CH is 1440.
kwkeirstead
Well-known member
More input possibly related to CH.
"Some cameras and broadcast systems that use 1080 vertical lines per frame do not actually use the full 1920 pixels of a nominal 1080i picture for image capture and encoding. Common subsampling ratios include 3/4 (resulting in 1440x1080i frame resolution) and 1/2 (resulting in 960x1080i frame resolution). Where used, the lower horizontal resolution is scaled to capture and/or display a full-sized picture.
"Some cameras and broadcast systems that use 1080 vertical lines per frame do not actually use the full 1920 pixels of a nominal 1080i picture for image capture and encoding. Common subsampling ratios include 3/4 (resulting in 1440x1080i frame resolution) and 1/2 (resulting in 960x1080i frame resolution). Where used, the lower horizontal resolution is scaled to capture and/or display a full-sized picture.
Barry_Green
Moderator
CH is a very low bandwidth 1080i recording mode. It uses about 3 megabits per second, at a prefiltered 1440x1080i resolution. It is about half the bandwidth of the existing HE mode. I don't know exactly what their plans were for this new mode, but I suspect it has something to do with wireless connectivity -- such as the EyeFi update. Lots of recording time at low bandwidth should mean much simpler wireless transmission.