I tested the camera in 2304x1296@30 25Mbit VBR mode. I got 20.1Mbit average bit rate. Camera worked stable.What is your code change for 18?
I think 25 Mbit average bit rate is normal for high speed SD card.
For 18Mbit CBR you can use following script:
Code:
################
# 2560x1080@30 #
################
# Set 18Mbit
writew 0xC05E89EE 0x4190
# Set Variable bitrate
#writeb 0xC05E89E8 0x03
# Set Constant bitrate
writeb 0xC05E89E8 0x01
################
# 2304x1296@30 #
################
# Set 18Mbit
writew 0xC05E8A1E 0x4190
# Set Variable bitrate
#writeb 0xC05E8A18 0x03
# Set Constant bitrate
writeb 0xC05E8A18 0x01