@vladnik tried loads of tests to get stable AQ3 or AQ4 at 100mbps on pappas death chart, most failed after about 2 - 10 seconds.
@danyyyel try out either my 100mbps or 140 mbps short GOP 3 settings on the LOW GOP thread with 3.62 - they are stable and preferable to most people over the old best GOP3 settings of 3.61.

for 100 mbit AQ4 is 7 qp and AQ3 is 10.
12 qp is probably minimum .

@vladnik

I want to max out quality and stability at 44M first. At some point lowering QP won't do anything any more. Eventually I plan to start increasing bitrate in order to determine when there is a diminishing return. My guess is that will happen by the time 66M is reached and going higher will not produce better results.

Chris

Contrast -2 might help, too.

@cbrandin Here's my 2 cents.

I guess a simple tactic would be keeping I-frame high enough and QP low enough. Once we reach I-frame large enough, we wouldn't gain much. Then shortening GOP makes sense for higher bitrate settings as lower GOP demands more redundancies which may not be a bad thing. The more I-frames per second, the less motion aliasing... although not proven yet.

44Mbps GOP12
66Mbps GOP12 or GOP6
88Mbps GOP6 or GOP3
110Mbps GOP3

All those settings might have almost same image quality on I-frames, but the higher bitrate gets more I-frames. So the diminishing gain in image quality might become non-issue for those who prefer shorter GOP. I think each setting would be perfectly fine, and we have more choice.

BTW it would be nice if 24L and 24H can have different GOP value so that I can have 44Mbps GOP12 and 110Mbps GOP3.

I'm a Mac user and just got a PC for SP app. Can someone point me to how to post the Stream Parser graph.
I'm a bit lost.
Thanks

Thanks for the Help Mihuel.
much appreciated.
Luke

Here are some updated standard GOP settings. One is at 2x(44M), and the other is 3x(66M). As I expected, 4x (88M) does not improve on 66M significantly, so I am not bothering with those. As before, there is still the spanning issue sometimes.

Chris

Yeah, there are some technical refinements. It shouldn't look any different, however.

Chris

@cbrandin re your last settings here, why did you go for those values in High Top Setting (x2.40) etc?

@cbrandin I could not produce an uneven cadence with your settings, both 44Mb version looks great in stream parser and on screen, lucky we have you, thanks ;)

Though I do not firmly understand the theory, I changed a little and tested Chris's 66Mbps setting.

It was possible to record continuously during 30 minutes in 32Mbps(24L) though it was possible to take only up to 4GB with this setting in 66Mbps(24h).
Both, there was occasionally what was not able to be played in the camera.
However, it could play after turning off and on camera's power.

Im not sure this is correct setting...

@Chris

Thank you for information.

When I first used 66m setting, 24L was not able to be played in the camera.
Then, I combined with 32m though I understood the difference from what you intended because it was inconvenient.
Is it still useless?