GH4 : Best image quality (25 or 29,97fps ?)

[ita149]

Hi,

I have a question about GH4.

it can record 4k@25-29fps with an average of 70-90mbs according to my test, does it mean that 25fps mode has better quality than 29,97 ? Less frames so better quality per frame as it's the same data rate per second for the two settings ?

 

[Guest Ebrahim Saadawi]

Negligible difference if there is one at all, which I doubt.

Choose your frame rate according to the type of motion you want to capture, that's far more important than a slight theoritical difference in IQ, which doesn't even exist.

[ita149]

It was for capturing still from video so in my case it's important. But if it's like you said, difference is negligible, i will go for 29,97fps, thanks for your answer.

[nigelbb]

29.97fps vs 25fps is quite a big difference (around 20%) so theoretically it could mean the image quality is better at 25fps. It's a much bigger difference than 24fps vs 25fps where indeed the difference is negligible (around 4%)

[ita149]

Thanks for your reply, so 25fps is the way to go ^_^ .

[Vesku]

You can shoot a sharp clip with motion 25 and 30 fps and watch frame by frame enlarged 200%. If there is no visual difference in macroblocking it is safe to use both. For internet delivery 30P is smoother option. 

 

The IPB compression works so that there is not a big difference in IQ. I think both has 2 big i-frames per second and 12 or 14 small p/b-frames. The only difference is 4-5 tiny p/b-frames per second.