Have a Question for Me?

[johnyandell]

Yep! She emailed me and said she was going to use it. So I got up at 6am. Pretty cool.

[blake_b]

Question about Auto vs. Manual Shutter

Hi John,

I am interested in purchasing a camera for a significant amount of video analysis, and I read your article here http://www.tennisplayer.net/members/...yer_part2.html.

I have also read the following thread in the forum
http://www.tennisplayer.net/bulletin...17758#post1775

It appears that the newer Casio cameras like the Casio EXILIM EX-ZR100, and its successor, the Casio EXILIM EX-ZR200, do not allow manual shutter control while in video mode. They go up to 1/4000th of a second in automatic mode, but I am not sure how that is triggered. On some of the golf forums they are complaining about getting blurring of the club head using these cameras.

I have found some camcorders that do 60p and have a manual shutter control up to 1/10000th of a second.

In your opinion would 60p with a high speed manual shutter produce better results than 120 or 240fps with an automatic shutter?

Thanks,
Blake

[johnyandell]

Great question! 6 of one... but really you need both!

I would strive to find one of those older Casios on ebay or whatever... Nikon had a similar auto camera that we found worthless in auto mode...

We paid above retail for our second discontinued Casio, and gladly given what else is out there right now--but one thing I know, it will change...

[erland]

Help - QuickTime not playing High Speed videos after upgrade to OS Lion

Does anyone else have this problem? After upgrading to Lion (OS X 10.7.4), none of the High Speed videos load and run. The newest High Def videos work as well as the basic Stroke Archive videos, just not any of the HS videos. All of my software is up to date on my MacBook Pro. (BTW, the next Mac OS version, "Mountain Lion" is to be released in July so hopefully no problems will happen then - testing should be done asap with all new releases so users can have a heads up on improvements/issues)

As a side - do we need to buy "QuickTime Pro" to have better results/capabilities on this site? Moving the scroll point on the scroll bar to manually go thru the stroke at the speed you want is not the best interface - is the Pro version better at this? Any other suggestions/thoughts?

[stotty]

Does anyone else have this problem? After upgrading to Lion (OS X 10.7.4), none of the High Speed videos load and run. The newest High Def videos work as well as the basic Stroke Archive videos, just not any of the HS videos. All of my software is up to date on my MacBook Pro. (BTW, the next Mac OS version, "Mountain Lion" is to be released in July so hopefully no problems will happen then - testing should be done asap with all new releases so users can have a heads up on improvements/issues)

As a side - do we need to buy "QuickTime Pro" to have better results/capabilities on this site? Moving the scroll point on the scroll bar to manually go thru the stroke at the speed you want is not the best interface - is the Pro version better at this? Any other suggestions/thoughts?

I have had similar problems in the past with my Macbook Pro. Most clips I have downloaded will play on the version of Quicktime Player the Macbook Pro came with (my macbook is 3 years old). But some clips will only play with the older version of Quicktime Pro for some reason. I was prompted by the software to download the older version of Quicktime Pro which I did...now I can play every clip. I also have VLC which will play every clip also...and any problem clips that other software has trouble playing. VLC is a must to have on your desktop just in case some clips won't play in Quicktime, Media Player, etc...VLC will usually do the job and is a handy back-up.

[johnyandell]

Guys,

Let me just say that I have mixed feelings about Steve Jobs...Giancarlo is in Swtizerland visiting his mom...let me see if I can get him to post something when he gets back--he's been all thru this and it just makes my head spin. Hard enough trying to translate Brian Gordon...

[blake_b]

Camera

Hi John,

Thanks for the advice about the camera. I was able to find a new Casio FH-100 (that has the manual shutter control) on ebay. It is coming from Japan, from a highly ranked seller, so hopefully, I will not have any problems.

Blake

[johnyandell]

Congrats! There a few funky bugs but basically these cameras are awesome at the price (or even twice). Some of our recent high speed footage was shot with them and for the web the resolution is great.

[lobndropshot]

John,

When you do a video lesson how do you breakdown the usage of time?

For example:

In a one hour lesson
10% warm-up
10% set-up
20% video
20% Analysis
40% Practice

Thanks

[johnyandell]

Something like that. I don't time it but that's probably close!

[julian1]

what is the time between the ready position and the contact

Hi,
what is time between the ready position and the contact?
See the related post from TW below
Thank you
--->
OK I spoke with Andy Fitzell and he asked me to post to say that the video of Roger that he and Vic filmed at IW does not show racket acceleration continuing into the follow through.

One thing to remember is that he is shooting at 30 frames per second with cameras a significant distance from the players. This is different than the rigorous academic work of someone like Brian Gordon or Bruce Elliot who are filming at 240 frames a second or more.

Nonetheless his conclusion is that just prior to impact the racket is traveling at 68mph.

One tenth of a second later it is at 52mph and at this point the arm and racket are coming across the body.

One tenth of a second after that, with the racket wrapping back over the shoulder it is traveling at 22mph.

[johnyandell]

You mean before or after the split? Just as the split starts to contact?

[julian1]

After the split

You mean before or after the split? Just as the split starts to contact?

Yes,after the split step

[julian1]

The time spent in the boot shape loop

You mean before or after the split? Just as the split starts to contact?

Saying differently:
I was hoping to get the time spent on the "boot shape" loop in

http://www.youtube.com/watch?v=KHLzbvR3Xr4

My original question was about time between the start of the boot and the contact

PS I do NOT fps so the counter at the video is useless
Thank you

[johnyandell]

Just find a similar one in the stroke archive and count there. The fps is indicated at the end of the file name. that alleged boot is not always present as you will see.