Bitrates and quality in VFR vs standard modes. 30p vs 30fps VFR

[Jarek Zabczynski]

So here's something I've been pondering. Assuming using PH mode for everything here.

Does the AF-100 use the same bitrate for both 24p and 30p? If so, logically shooting 24p should result in a better picture no? Technically, a higher bitrate per "frame" so to speak right?

So...I shoot a lot of 30p for slo-mo in 24p. I know that bitrates get "cranked" a little when shooting in VFR mode. So would it make more sense to shoot 30fps in VFR for 24p over shooting in standard 30p and conforming? I know I would lose audio, but hey.

 

[Jarek Zabczynski]

Still wondering if anyone knows the technical answer on this.

 

[Steve Kahn]

Does the AF-100 use the same bitrate for both 24p and 30p?

I think the answer is yes. Only in over-crank is the bit rate increased AFAIK.

 

[Jarek Zabczynski]

So then I should have an increased bitrate when shooting 30fps VFR for 24p no?

 

[thepage29]

Oh i didnt know that. What is the bit rate difference between say 24p and vfr 24fps?

 

[Jarek Zabczynski]

Oh i didnt know that. What is the bit rate difference between say 24p and vfr 24fps?

One would assume it's the same, but maybe a bit lower when shooting 30p at 24fps VFR? That's what I'm trying to figure out. VLC doesn't give accurate bitrates on playback.

 

[antonyoung]

Why don't you shoot a 10 second clip at each setting and compare the resulting file sizes? Then compare the resulting footage and see if you can in fact see any difference?

 

[Jarek Zabczynski]

When you record VFR you don't get audio, so those files would be smaller already. Tough to test since the the bitrate is variable.