Stuttering footage shooting at 25p (newbie)

L

LuDia

New member
Hi all,

I'm new here and in the world of shooting footage in high quality.
Let me briefly introduce myself first....

I'm from the Netherlands and in my daily life I work as a Product Lifecycle Management Functional Consultant for a worldwide manufacturor of food processing equipment. In my free time I work a lot with music (Pro Tools, VI's --> Omnisphere,Trilian,EWQL). The PC rig I've got is for sure capable of handling also HD footage as it is an i7 950 with 12Gb RAM and 3x 1TB SpinPoint discs running on Windows 7 Ultimate 64bit.

Just recently I bought myself the AG-HMC151e and am in the process of learning the device. Reading thru a lot of the threads of this forum I already figured stuff out like for example the manual focus setting was not listening to the adjustments I did with the ring. The auto always kicked right back in. Reading some of your posts made me change a menu setting and voila.:cheesy:

Also found a nice scene file setting here to give just that nice feel to the footage.


However....I do have a problem... I hope someone can shed a light onto it....

I was trying to create some footage in different recording modes to find the most beautiful images. I thought that would be the PH 1080 25p on 50Hz. But I was wrong. Shooting with this setting the panning becomes stuttering. It's not the processing power of my pc because playing the footage directly via DHCP onto my Full HD TV is the same. Also I can see the stuttering in the viewfinder and the LCD. The SD card I'm using is a class 10 one 32Gb in size.

When I shoot footage in the mode PH 1080 50i on 50Hz. Everything is smooth and movement of characters in the shot is totally natural compared to 25p.

I read in one of the threads that 720p is this cam's sweet spot. That might be true, however I didn't buy me (quite expensive for a hobby) a full HD cam to shoot at 720. The other thing is that shooting in 720 25p is giving me the same stuttering results. Going to 50i in 720 is smooth again.

I''m not sure if this is what it is supposed to be or not and some advice or comments would be highly appreciated. I wouldn't ask for this if it wasn't that I got in touch with someone the other day via vimeo who is using the same cam and does not have these stuttering results shooting at 25p.

I created quickly short footages. Each time the same shot at different settings. Here is the link to get them...
mediafire.com/file/l7b7ufk7ddi46n1/footages.zip

The first shot is taken at 1080 25p
then 1080 50i, 720 50p, 720 25p and the last one at 1080 25p with the shutter set to 1/250. With the other shots the shutter was switched off.


Again, any insight is highly appreciated


Thanks in advance


Regards, Luc
 
ill wait for someone else to comment ,but you need to realize that you simply cant pan as quickly and expect good results when your shooting at 25 (24) frames per second ,the camera isn't capturing as many frames as is when you shoot at 30 or 60 fps
 
wannabeapilot said:
ill wait for someone else to comment ,but you need to realize that you simply cant pan as quickly and expect good results when your shooting at 25 (24) frames per second ,the camera isn't capturing as many frames as is when you shoot at 30 or 60 fps
Click to expand...

Thanks for responding. Yes I know, the less frames the slower the panning should be to have a smooth transition. However, looking at the footage made by the person I met a few days ago was waaayyy smoother then mine. But, as said, I'm not sure if the results I have are good or not. I doubt if they are, I have the feeling I'm missing something somewhere.

Would it be a problem though shooting at 50i ? The things I've tried out are looking very good at 50i. Working with the scenes are not cousing troubles. The downside I've noticed is the export. Creating an blu-ray output and playing back are giving the obvious interlacing artifacts unless played back with PowerDVD because it de-interlaces automaticly. Creating other kind of outputs are not that nice to watch meaning I really would like to shoot at 25p (PAL over here).
 
Don't know if you've checked it, but the shutter speed could also be responisble for the problems you describe. Try to push the shutter button to turn it off (if it's not off), that should help. Higher shutterspeeds might give these effects.
 
If you have OIS turned on, it can also cause "stuttering effect" when panning.

There is a chart in Barrys HMC book which gives acceptible pan rates based on frame rates for "acceptable" film look. I don't have the book in front of me right now, but I reacll thinking that the pan rates must be really slow...
 
Yeah, this one has been hard to keep in mind (for me). The pan rates for 24p are v-e-r-y slow, e.g., at full zoom, a 90 degree pan should go no faster than 108 seconds!

Most strobing (stuttering) at 24p is the result of panning errors. Film DPs have been dealing with this issue for decades. It's no different for video -- same rules apply.

Barry's books explain this (and possible solutions) very well, including a quick-reference chart.
 
Thanks for all your comments. Highly appreciated....

Regarding the shutter. I have it switched off. I tried different settings with the shutter but made no difference in normal (define normal LOL) shots to me except things getting darker.

Regarding the OIS. I have it turned off using the tri-pod.

I'm very interested in the book of Barry, I just can't seem to find it in any store over here in The Netherlands. Does anyone know the ISBN number of his book so I might be able to order it in a better bookshop over here ?

Thanks all


Regards, Luc
 
Luc --

You can order the book directly from Barry: http://fiftv.com/HMC40/

That's the link to the HMC book, which covers (I believe) everything in the HMC-150 book, plus the HMC-40, along with some additional (& very useful) articles.

-vic
 
You must log in or register to reply here.
Back
Top