@kae

Just applied your July 27 "65M extreme 1080 24 3 GOP settings WITH stable settings for the other modes"

No problems shooting and playing back in camera using Transcend Class 10 SDHC card. Clips play perfectly off the card on my Panasonic DMP-BD35 Blu-Ray player's SD card slot too.

Nice! I'll stick with these settings for now even though I don't use anything but 24p

@stonebat I like your rig. What is it? Where did you get it? and How much was it?

@stonebat

You've just uncovered the issue with low GOP 720P and 1080i modes, it'll look like it's writing fine, but streamparser reveals the flaw. This is why I stuck with 12 GOP in those modes in my combo patch above. I only get an average stable write speed of only 35-40Mb/s in 720P but I don't use those modes much anyway.

@kae I modified your latest setting.
Video Bitrate FSH/SH=54000000
720p60 GOP Size=3

It didn't crash either. It began like 54Mbps, but it quickly drops to 34Mbps. Here's my wild guess. 720p Top Setting=31878 and 720p Bottom Setting=22314 are a way too high for gop3. That's 20 i-frames per sec... kinda overkill.


720p60 GOP6 & Video Bitrate FSH/SH=54000000 didn't crash either. Similar behavior. From 54Mbps to 34Mbps. Notice the high bits sized i-frames in every 12th and 13th positions. If all i-frames were that high, it would have given close to 54Mbps bitrate.

@kae

I shot with your settings all day. 50 or so clips including some driving all in 24p. Driving was flawless.
Data rate on clips was 45000000 mps up to 69000000 mbs.

No data write errors on the 2 transcend cat 10 16gb cards I used. I have 3 others to test but don't expect issues.

The only thing that happened today, is the last 40clips or so were of hanging out near the water and me, gh2, & tripod playing. Lots of 1-2 minute clips. No read errors, but I started playing every clip I shot and on occasion I'd get "can't play this clip. I'd have to shut down/restart camera to be able to play. This seem to happen every 3-4 clips.

Will try again tomorrow. I'm going to check and see if the clips playback issues were on the higher data rate clips as I was up and down today.

@jfro

Great to hear! These are the results I'm getting. I too, get the clip cannot play error once in awhile. Turning cam off and on resolves it immediately. I'm assuming your long drive files span???

65 MB/s Extreme Motion Test Footage

I'm a bit stunned at how crappy the Vimeo decoder is when transcoding MTS files that have a high data rate and heavy motion. The Vimeo transcode strobes and stutters like crazy and the motion is far from the original. Perhaps this is why GH2 24P is getting a bad name, people aren't watching the original .mts files.

Anyway, I have shot a 30 sec test clip to demo the 3 GOP 65Mb/s settings with heavy motion. It looks very much like what I see hand held with film with a fast shutter like we use for fight sequences. If this was shot at a lower data rate and a long GOP the results would be noticeably different (worse). To me, this is the strength of 3GOP or lower AVCHD.

Footage is ungraded original, dynamic mode at 0 for all so the blacks are a bit crushed, 14-140mm panny lens set at 14mm, hand held, auto focus (it hunts a bit), F4, ISO 640, WB at 7500K, my guess is the auto shutter is at 80-120 throughout, OIS is OFF, shaky cam is intentional, I see some edge blurring when shaking the cereal bin but not much and bearable. This clip is not meant to be high art but strictly a demo of 3GOP high data AVCHD for those who can't wrap their heads around the benefits of it for heavy motion.

It was shot with the combo 65Mb/s 1080 24P settings I posted a couple days ago and have attached again below on a Dane-Elect 32GB averaging roughly a 61Mb/s data stream.

Original MTS File is here at Filesonic: http://www.filesonic.com/file/1564573944/KAE65extremeMotiontest.MTS

It's 248 megs, about a 10 minute download.

YOU WILL NEED POWERFUL CPU to play this back because it is a non-standard 3 GOP file. WMP on windows works great it may stutter with VLC.

If you like this look and want to use these settings please DONATE to Vitaliy at Personal View, he needs all the support and gratitude we can give him for this incredible hack.

@last_SHIFT

Then maybe Transcends are ok? Perhaps people have just been mixing and matching settings and screwing up the 65MB extreme ones.

@kae

Both my Transcend C10/16GB cards work as reported above - however I notice the in cam playback errors are more frequent now as to when I first applied your 65GB settings (maybe coz I'm shooting more?).

@Kae: I have one Trancend that works well, another that hangs up... so maybe a bad batch on the one, maybe a counterfit... who knows? But there seems to be a consistency problem.

@Ian_T
See above - shutter was auto. My guess is 80-120. Let's make sure we keep on the low gop settings topic or Vitaliy will bump us ;-)

That was kinda nice. Weird... but nice demo.

@kae:
any comments on my weirdly bad results? I did not change a thing in your preset. edit: okay did use 3.60 with 3.61 and the added options, it works great!!