Which Ptool Patch for Best Slowmotion Output

[Observe]

Hello can everyone please give me their advice on what patch and or settings choices are best for final output of footage to slow motion?

I am somewhat confused as to keyframes per second, GOP, and frames per second and what affects they have when you reduce the playback speed in vegas.

Speaking about his fast action 3 frame patch lpowell said:

I set out to optimize the GH1's patched 720p30 AVCHD video mode for the highest reliable bitrate. I also wanted to reduce the number of P-frames in each GOP (Group of Pictures) in order to improve the encoder's ability to record fast action sequences without muddying the details. 720p60 AVCHD videos have a GOP-length of 30 frames, recording a key frame only once every half second. In addition to undermining the encoder's action tracking ability, a 30-frame GOP produces choppy results when scrubbing through the video stream in a post-production editor. So long as you can maintain an adequate bitrate, the shorter the GOP-length the better.

What was even more impressive was discovering that I could optimize 720p30 video down to a remarkably short 3-frame GOP-length, without even a hint of instability. This produces a key frame every tenth of a second, combining fast action tracking with over twice the compression efficiency of the 720p30 MJPEG encoder. For highly detailed scenes, use of optimized "C" settings produces average bitrates of around 50Mbps with peak bitrates up to 55Mbps, for both 720p30 SH and 1080p24 FHD modes. Since there are now only half as many frames in 720p videos as before, boosting the 30fps bitrate to 50Mbps produces compression quality comparable to what would be produced by 100Mbps at 60fps

So is what he is saying that the 720p 60fps regular mode actually has less keyframes per second as lpowell's fast action 3-frame patch in 720p 30fps? Does that mean that using the 30fps lpowell's patch and slowing it down would visually produce smoother slow motion than the normal 60fps avchd setting?

Is it true that it is the keyframes that are more important than the fps when going to slow motion in final output? So in this case if someone shot at 30fps on one gh1 (with the fast action lpowell patch) but had more keyframes per second than if he shot on another camera at 720p 60fps (blackout-powell native 24p patch) on another camera that had less keyframes per second, would not the 30fps fast action patch produce smoother final slow motion output than 720p 60fps?

I am asking this because of what seemed to be implied by lpowell, and also it is my understanding that between the keyframes are basically just repeat frames that the camera interprets until the next keyframe, correct?

Thank you.

 

[kumi]

hi i also thought about this. i made some tests with various patches for gh1: fast action 3gop @30fps, standard 720p@60fps and 75mbit peak performance 720p@60fps

slowed the footage down to ~30% in cs5.5 .. result in my opinion: 60 fps high gop beats 30fps low gop
did not test with some effects (motion pixel after effects)

i would just say try it out and choose what fits best for you