GH2 GH2 failed at recording 60P.

M. Gilden

Canon DSLR Moderator
Ok, I will admit that I haven't actually recorded 60P that often with the GH2, since it required dropping down to 720p.

In the past I've done it a handful of times, and I thought it was achieved by setting to manual movie mode and then 720p in the recording options. Panasonic has a funny habit of not labeling their video mode options with framerates, so just usually keep in 24p. However, I recall it being: 1080p is 30fps unless in cinema mode for 24, 1080i is 60i, and 720p is 60p.

That being said, here's my problem:
I recorded a bunch of clips for a music video that I intend to slow down in 720p, and sure enough my computer recognizes the clip as a 59.9fps. But when I conformed it to 24p, it seemed very choppy playing back. Felt like it was missing frames, like I had throttled down a 24fps shot instead of overcranking and conforming from 60. Sure enough, when advancing frame-by-frame in my NLE, every other frame is a duplicate! It wasn't 59.9fps, but rather 29.97 in a container with 2x the fps!
I'm so very frustrated, I mean I can still slow it down to 24 and get a little bit of the overcranked effect, but nothing like what I was trying to achieve (and there is no time to reshoot).

But more importantly, what did I do wrong and how can I avoid it in the future? Did I somehow record 720i? It doesn't appear to be interlaced at all, but then why is it doubled-up? I'm too tired to think so its very possible I'm overlooking something simple.
 
You most likely shot at a shutter speed that was slower than 1/60. If your shutter speed is 1/50, then shooting 60fps is impossible and so the camera drops down to a speed of 30fps. Only shutter speeds of 1/60 or faster will allow the camera to record 60fps. I've made this mistake before.
 
I would verify the raw footage is not running actually at 720p & at 60(59.9) with an app like VideoSpec (Mac). Or open the the AVCHD file with 5DtoRGB. It could be the NLE that isn't handling it correctly.

I have a hard time remembering the modes, especially when I haven't used the camera in a while. Use the chart on this page. The "MMM" refers to the manual movie mode which should be the left setting under Motion Picture mode. i don't think you could have recorded in 720 29.97, it only records 720 as 60p.
 
All the signs point to having a shutter speed slower than 1/60th. When that occurs, each frame will play twice in the timeline as the OP experienced. Since shooting 60p at 1/50th or slower is impossible (can't have a shutter speed slower than your frame rate...that's how the universe works), the GH2 drops the frame rate to 30p but puts it inside a 60p stream. Each frame gets duplicated in other words. So, when you conform to 24p, it plays in slow-motion, but every frame plays twice.
 
All the signs point to having a shutter speed slower than 1/60th. When that occurs, each frame will play twice in the timeline as the OP experienced. Since shooting 60p at 1/50th or slower is impossible (can't have a shutter speed slower than your frame rate...that's how the universe works), the GH2 drops the frame rate to 30p but puts it inside a 60p stream. Each frame gets duplicated in other words. So, when you conform to 24p, it plays in slow-motion, but every frame plays twice.

Thanks guys- this sounds exactly like what happened. It was indoors walking down a corridor, I was trying to make use of available light so shutter went down to 50. It didn't even occur to me that this would be a physical impossibility. That's a really annoying oversight on my part but I'm glad we got to the bottom of it.
 
That's a really annoying oversight on my part but I'm glad we got to the bottom of it.
I've done it more than once. That's why I knew what the problem was. You get the footage back to your edit bay and smack your forehead. The other thing I've done in haste is forget to set the camera back to 1080 24p after shooting 720 60p. That's annoying too!
 
You can set the C1, C2, C3 dial modes to whatever you current settings are. I'm setting mine to C1 1080p 24, and C2 720p 60. Just set all your settings in the Creative Movie mode, then in the menu under the custom tab the first in the list is "CUST.SET MEM." there you just choose C1, C2, C3.

I think I will have to have reference on my iphone or something so I know what I've set.

Thanks Andrew Reid for your GH2 Shooter Guide, it has been very helpful. Especially when you dont use the camera all the time.
 
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