I did some research in the forum about PTools settings but I did not find the answers I need...

What happens is:

Only GOP which works good for 720p 60p are GOP 30 and GOP 3, all other GOP gives diagonal pattern (rain) in computer monitor. But the GOP 3 in 720p always stops recording and it seems the card is not the problem, I am using Sandisk 45mbps and other people says the Sandisk 95mbps also stops recording in 720p hacks... The GOP 6, 12 and 15 works for some shoots, but they are unstable (sometimes stops recording) and gives diagonal pattern (rain) in computer monitor. GOP 3 stops recording all the time, no matter the bitrate (I tested GOP 3 from 40 to 200mbps). So GOP 30 is the only option.

Problem is: when using the GOP 30 the camera encoder always keeps the bitrate very low when the camera is quiet, when there is no motion in the image, and this gives lots of macroblocking and texture lost in low light. Even when I set the bitrate to 48mbps or 64mbps in PTools the camera does not record 48mbps or 64mbps, StreamParser shows only around 23mbps... (for static low light shoots)

The auto quantizer all to motion or all to details did not make any difference. So I did some try to change settings in TESTER options of PTools. I fount the TOP and BOTTOM bitrate limits and I enabled it with 48000 and 42000 for top and bottom 720p, but this makes no effects in encoding, bitrate is still very low for static shots no matter the bitrate I type in PTools...

Only thing I found to make the bitrate encoding keep high is the GOP 3, but camera stops recording in all 720p shoots, the GOP 3 just works for 1080p.

So I am wondering if there is a way to keep the bitrate high using GOP 30 in 720p...

Any suggestion welcome, thanks.