Comparing Videos Side-by-Side on the Forum_ Test

Chas Tennis

G.O.A.T.
The best available way to compare two strokes is by using side-by-side videos examined frame-by-frame.

The purpose of this thread is to display two Youtube videos side-by-side and allow single frame control on each video.

One problem is that if you click on a Youtube video in the usual way to select it, the video starts playing automatically and that encumbers viewing two videos each one frame at a time.

UPDATE - A fix was found that works, go to post #5.

The fix only requires two Youtube videos on a forum post and some simple instructions.

Kinovea does excellent side-by-side videos and single frame viewing but requires readers to have Kinovea (a free open source video analysis application). Kinovea has much more than this one trick pony and is recommended for interested parties.
 
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Chas Tennis

G.O.A.T.
I think that we have a fix!

I received this advice from another forum, dpreview. I gave a link to the OP.

"On the forum thread that you linked to, if I alt-click (press alt then simultaneously left mouse click) on the youtube frames, I can select each youtube frame without causing it to go crazy, e.g., start playing, advance the timeline. After using this alternative way of selecting each youtube frame, I am able to advance/backup by single frames using the period/comma key. Note that I had to avoid clicking anywhere near the timeline when using this technique. If I alt-click near the timeline, it advances to the selected time, as you describe.

This is on a Windows 10 machine using the Chrome browser.

Ken"

So far Ken's advice to use ALT & LEFT MOUSE CLICK when you place the cursor on the Youtube video is working. Plus keep the cursor away from the time line. Read his instructions. I am using Windows 10 and Chrome also.

(I use a laptop touchpad instead of a mouse and you must keep your finger away from the touchpad when not moving the cursor. I believe that might also cause the video to play.)
 
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Chas Tennis

G.O.A.T.
Alt-left mouse click also works to single frame on two videos on the same forum post. This places the two videos close, best for comparisons.
Video by Van Scheppingen Tennis

Compare any two forehand clips.
1) Go to video and stop near a forehand impact.
2) Place the cursor on the video - always well away from the time line - and hold the Alt KEY down and click the LEFT MOUSE BUTTON to select that video.
3) On Youtube use the PERIOD/COMMA KEYS to advance or go back one frame. Find frame closest to impact.
4) Go to second video and repeat above steps selecting another forehand impact.
5) Move across frames to compare videos always using Alt-Left Mouse Click to select the video that you want to work on.

This is working on my computer with Windows 10 and Chrome. I am using the laptop touchpad. There were no unintended starts of the video playback when using Alt + Left Mouse Click.

Murray at :08 sec vs Del Porto at 2:35 is an interesting comparison. Compare Del Porto's high racket take back.

Could some readers please try this and post back any issues.

What needs to be made clearer in the instructions?
 
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Chas Tennis

G.O.A.T.
SOMETIMES IT WORKS - SOMETIMES VIMEO SINGLE FRAME AFFECTS YOUTUBE ?
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Comparing Youtube & Vimeo Videos Side-by-Side and Single Frame.

Video by Van Scheppingen Tennis

For Vimeo
1) Select a forehand and stop on the impact frame.
1) For single frame in Vimeo, selecting the video does not automatically start it playing. No problem.
2) To single frame on Vimeo hold down the SHIFT KEY and use the ARROW KEYS.

For Youtube
Compare any two forehand clips.
1) Go to video and stop near a forehand impact for comparison.
2) Place the cursor on the video - always well away from the time line - and hold the Alt KEY down and click the LEFT MOUSE BUTTON to select that video.
3) On Youtube use the PERIOD/COMMA KEYS to advance or go back one frame. Find frame closest to impact.
5) Always use the Alt-Left Mouse Click to select the Youtube video that you want to work on so that it will not start playing.
 
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