Interested to see with the higher iso if there is any improvement in low light shooting vs GH3

@driftwood - I wonder if 96fps is only possible internally or also through HDMI. Thanks.

@driftwood Would love to know more about converting the internally recorded 4K 4:2:0 8-Bit footage into 1080p 4:4:4 10-Bit. Thanks!

Quote: Would downscaling 4k 4:2:0 into 1080p 4:4:4 give a better key?

Not really. Remember, you still have the same color information to work with. You're not magically getting more color information by down resing. The main advantage of down resing before pulling the key is that it will render 4 times faster, since you're only usiing 1/4 the pixels.

However, to pull a key at 4:4;4 you need a keyer that works in RGB space. Not all keyers do. Some work in YUV space. If that's the case, you'd be better off pulling the key at 4k 4:2:0 and then down resing.

Interest thing I perceived:

I saw the youtube aerial shoot in a 1280x720 monitor and also in a 1920 x 1080 monitor. In the 1080 monitor the image is perfect, I believe this camera will be just great for digital cinema theathers with big screens. But in the 720p monitor, the downscale introduces moire in the roofs... maybe this is due to the very high resolution and sharpness from the 4k footage.

I saw also some footage from the Nikon D5300 showing roofs. In the 1080p monitor it is less resolution and a little softer compared to the GH4 of course. But the D5300 downscaled to 720p in the 1280x720 monitor is much better because it becomes very sharp and does not introduce moire in the roofs. Also I perceived that the D5300 footage in windows media player is less dynamic range and less resolution compared to the quick time player, the quick time deals with dynamic range much better when playing and the perceived resolution becomes better also.

So I concluded this: for web delivery the D5300 can be a better option, because most people will see the video in tablets, laptops, notebooks, netbooks, smartphones, which have lower resolution screens. And for bluray, fullhd tv sets and fullhd projectors the GH4 will be better due to the higher resolution and sharpness.

Yes, if using Olympus m4/3 lens. If using 4/3 then zuiko lenses compatible with the Panasonic DMW-MA1 Mount Adapter or Olympus equivalent will work full auto on the GH4.

Aliasing in 1080p and 4K downscaled to 1080p compared to GH3/GH2 1080p. Thanks!

@driftwood it would be great if you could try out AF tracking and let us know how well it works.

@driftwood I would like to ask if the uncompressed 4:2:2 8/10bit signal from hdmi can output more than 30fps to external recorder (50fps or 96fps in VFR mode possible?)

thank you

Zacuto and Panasonic's Matt Frazer

@ Ralph_B

Quote: "Quote: Would downscaling 4K 4:2:0 into 1080p 4:4:4 give a better key?

Not really. Remember, you still have the same color information to work with. You're not magically getting more color information by down resing. The main advantage of down resing before pulling the key is that it will render 4 times faster, since you're only usiing 1/4 the pixels.

However, to pull a key at 4:4;4 you need a keyer that works in RGB space. Not all keyers do. Some work in YUV space. If that's the case, you'd be better off pulling the key at 4k 4:2:0 and then down resing."

I agree that doing the key at 4k would be better. You can do a key with 4:4:4 codecs such as Apple ProRes as they are YCrCb codecs not RGB. If the original poster was asking if shooting 4k and down-sampling to 1080 would result in a better key than shooting 1080, then one needs to remember that to achieve a good key, the luminance channel resolution is VERY important. Keying at 4K will give much better results.

Also, down sampling 4K 4:2:0 to 1080 will give a result equivalent to 4:4:2 not a true 4:4:4. If you need to understand this in detail look it up on Wikipedia , all the info is there.

My workflow will be to produce everything at 4K including graphics & effects and then down-sample for delivery. Also keep in mind that the software one uses for conversion is also very important to keep the quality at a high standard.

@driftwood: I would like to know whether the advertised new custom white balancing features allow to deal with extremely "colored" light (the GH2 had kind of very narrow margins within which one could counter-act with custom white balance).

Most simple test would be to light a room with a colored light - using e.g. indirect light from a spot to a colored paper - then try to compensate using "custom white balance" on a grey card. Does a picture then actually show that greycard as grey, or will it still have a tint?