Hi-Speed camera

[garman]

Hey guys, It's been a while since I posted. I even remebered the password. I just bought a video/digital camera that shoots 300fps@ 512x384. The playback gives me a slow motion factor of 10X at 30fps. My question, if I lengthen the slow motion time by a factor of 20X and the frame rate drops to 15fps, will the playback look choppy. Or better to have a factor of 15X @ 20fps. Thanks Garman.
Here is a link to the camera. Casio Ex-F1

http://gizmodo.com/383843/casio-exilim-ex+f1-slow+mo-super-cam-full-review-verdict-tot...ingly-powerful

[guns1inger]

This is the type of question I don't understand. You have the camera, It would take you 10 minutes to try this out for yourself to see what works best. After all, this is a completely subjective question. What is jerky to someone else may be perfectly acceptable to you. Why wait to find out what someone else thinks when you already have the answer if you put in a couple of minutes effort yourself ?

[garman]

This is the type of question I don't understand. You have the camera, It would take you 10 minutes to try this out for yourself to see what works best. After all, this is a completely subjective question. What is jerky to someone else may be perfectly acceptable to you. Why wait to find out what someone else thinks when you already have the answer if you put in a couple of minutes effort yourself ?

That's the rub, Right now I don't have any software that can lengthen the time. Years ago I had Adobe Premiere I tried doing what was said and it looked very choppy, but the was real time speed at 30fps not some slow motion effect that I am discussing. Anyway thanks for your input. i hope to hear from others

[aedipuss]

it's already recorded in the camera at 30fps mp4. stretching it out more during editing wouldn't do anything but make it more jerky.

[tmw]

My question, if I lengthen the slow motion time by a factor of 20X and the frame rate drops to 15fps, will the playback look choppy.

That totally depends on what you are shooting, and how your process it. The Gizmodo tomato in a blender video from 300 fps played at 30 fps looked choppy to me--for that speed of action, the 600 fps was needed to capture something that didn't look so choppy. But, that will depend on what you are capturing and your personal preferences.

It looks like the camera capture H.264 AVC. It's an interesting camera, but I haven't used it and can't tell you the best way to process that kind of video data. Look at an H.264 player that can play in slo-mo or something that can edit that kind of video natively as your best bets.

[garman]

As for the video, I am able to use iMovie. I have a mac, but editing options are very limited, unlike premier. You see I want to keep the resolution but want the capture to look 15x or 20x slower. I think you may be right regarding how choppy play looks when capturing certain images. it looks like very quick motion will look somewhat choppy as opposed to some one running. Anyway here is a link of what 300fps looks like. Down side to this camera. It demands bright lighting. Thanks
http://www.youtube.com/watch?v=Dtah1_2i4io

[jagabo]

Both 15 and 20 fps will look look jerky. Which looks more jerky depends on the frame rate of the viewing device.

On a 60 Hz display each frame of the 20 fps video will be displayed 3 times. Each frame of the 15 fps video will be displayed 4 times. The 20 fps will look a little smoother.

On a 75 Hz display each frame of the 15 fps video will be displayed 5 times. Some frames of the 20 fps video will be displayed 3 times and some 4 times. This will add a judder in addition to the inherent jerkiness of 20 fps. That may look jerkier than the 15 fps video.

[aedipuss]

with the camera's frame rate at 300fps and the recorded frame rate of 30fps you have already lost 90% of all motion, as only every tenth frame is captured. it's like if you were to record of a runner on a football field, you would only capture him at the 10 yard marks, with nothing between the 1 to 9 yard marks.

the blender is an optical illusion, the circular motion of the blade tricks the eye. if you only watch the tomatoes it is not smooth at all.

[jagabo]

I thought he was talking about slowing the 300 fps video down to 30 fps (and making the runtime 10x longer) like in the youtube video, not decimating and keeping the runtime.

[aedipuss]

the camera only records at 30fps already. every tenth frame of the 300fps shutter speed.

[jagabo]

the camera only records at 30fps already. every tenth frame of the 300fps shutter speed.

That's not what I've seen looking at samples. The camera appears to shoot 300 (or 600 or 1200) frames per second but marks the MOV file as 30 frames per second. So 1 second of realtime displays as 10 seconds of video. You see all 300 frames.

Some samples:

http://www.steves-digicams.com/2008_reviews/casio_ex-f1_samples.html
http://www.exilim.com/intl/ex_f1/mov09.html
http://www.exilim.com/intl/ex_f1/mov04.html
http://www.exilim.com/intl/ex_f1/mov07.html

[garman]

aedipuss.... sorry to confuse you. I guess my grammar needs work. It shoots 300fps but plays the file back at 30fps making 1 second of video to 10 seconds in real time.
600fps and 1200fps takes a large drop in resolution. I guess with 600fps you can make a letterbox SVCD and the 1200fps you can make a letterbox VCD. Unfortunately the bitrate takes a nose dive at using higher fps. The 300fps uses 1500kbits
What hoping for...... Is that this camera becomes popular. This Digicam is screaming Hack Me!