16 Reply by AlexanderH

(15 replies, posted in Ideas and feature requests)

The superposition affects the quality of the video a bit too much,.
In an earlier verion of Kinovea there was the possibility of sending a small screenshot into the other video?

This is of course avery specialized function...but it would help in keeping track of the hundres of clips recirded during a competition. I tried to record with two webcams positioned perpendicularly to each other with a delay of 3 sec to catch the incoming athlete and 1s to anticipate the jump off the board, but that made a huge drop in FPS.... An early snaphot could help?

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17 Topic by AlexanderH

(15 replies, posted in Ideas and feature requests)

Would it be possible in the two screen recording option to use the joint control for recording one video and take a snapshot, both with their own assigned delays?
The snapshot could then be inserted into the video for visual identification.

Example:
recording the take-off of a longjumper (1. cam) and his adding his race bid number from the run-up (2.cam)
not to waste any bandwidth of the recording.

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18 Reply by AlexanderH

(3 replies, posted in Ideas and feature requests)

joan wrote:

If I understand correctly, this would be under the assumption that the movement is linear between the two frames. In reality the subject is most likely accelerating/decelerating but it could be a good enough approximation in many cases, better than nothing anyway.

Maybe this could be integrated into a line tool. You trace a line between two points that are supposed to be in two consecutive frames, and the line would have graduations corresponding to subdivisions of the frame interval, and show the corresponding time at each graduation.

Or a line with one sliding point in the middle, with a mini label attached, and you slide the point to where you are interested in reading the time.
Maybe called "time segment" tool, a segment of a timeline.

Yes. Primarily the idea could work for estimated timing in between video frames. The assumption of no acceleration/deceleration is one way to go, but the more complicated way would be using similar "shadow" lines in front and/or after this border and calculate the changes in pixels before/after those lines = change in linear speed....

"This will only give the time. For the crossing speed it's more complicated. Maybe an alternate metric that gives the ratio between the two parts, so you can do the computation later after export if needed."
That could be a good solution. I do think the timing is of greater important because of the FPS-limitation in videos....

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19 Topic by AlexanderH

(3 replies, posted in Ideas and feature requests)

Kinovea could be used for more accurate speed/distance calculation of a moving object if the movement was defined in relation to pixels before/after a defined border in the static video?

Instead of using the division of fps restricted by the camera (30, 60, 120...), the calculation would be related to the tracked frame before and after the crossing of a defined line. The division by the fps would be further split to the amount of displacement in pixels between two frames?

In a 30fps video the maximal accuracy with measuring frames alone, would be 0,03s...
If the object is moving  fast across the screen (8-10 frames....0,3s)....1000 pixels....100pixels/0,03s....and the border is in between two frames- 35 pixels off on the right side and 65 pixels on the left - 35/100*0,03s=0,0105s before and 65/100*0,03=0,0195s after the line....

Or is this within the calibration?

I would like to use Kinovea for timing athletic sprinters at fixed distances; 20m, 30m, 40m.....

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20 Reply by AlexanderH

(4 replies, posted in Bug reports)

I maximized the memory buffer with a 1s delay, both cameras were recording in FHD at 30fps, streaming in MJPEG.
1. webcam is a Logitech 920 and the 2. a TRUST Full HD.

After trying out with another Logitech 920 and a Streamplify cam, I suspect that the issue IS related to the TRUST webcam (compression?)

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21 Topic by AlexanderH

(0 replies, posted in Cameras and hardware)

Anybody tried out the Streamplify webcam?
Seems very priceworthy...

https://www.streamplify.com/


I took the jump at Black Friday...50 euros....VERY good pictures and video quality. Plug&play FHD 60fps.

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22 Reply by AlexanderH

(4 replies, posted in Bug reports)

I am recording from an old laptop USB 3.0 Win 10

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23 Topic by AlexanderH

(4 replies, posted in Bug reports)

I am recording FHD from two webcams simoultaneusly with autostop after 5 seconds. The first cam gives me 5sec, but The second stops after 0,7s....?
I have saved The files in separate locations with instant autoreplay. It is not cameras related as The problem persist when switching The cams...

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24 Reply by AlexanderH

(16 replies, posted in Ideas and feature requests)

Yes, Joan, definitely and there is an optimal height, too.....if the camera is placed too low, the perspective of the board and focus can be distorted....if it is too high, there is a risk of the swinging foot covering a critical frame at the board.

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25 Reply by AlexanderH

(16 replies, posted in Ideas and feature requests)

OK. This is probably my "final" solution:

I have a Xiaomi Redmi Pro 10 android smartphone (FHD at 60fps or high speed 120fps) filming the board, connected by USB to my PC. The camera can be started/stopped with a bluetooth remote button I bought from ClaesOhlsson. The smartphone is seen as a external disk and I can manually drag every, new file to a replay folder on my screen. I have two Kinoveas running observing the replay folder; one is playing the clip on a separate screen and the second is for closer analysis/zoom/step by step/saving if needed.
The process from the jump to showing&analyzing the clip takes 10-15 seconds....

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26 Reply by AlexanderH

(10 replies, posted in Cameras and hardware)

The motion detection software ZoneTrigger can be configured to trigger Kinovea by dedicated HotKeys. You will need one camera for the trigger and one for Kinovea....

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27 Reply by AlexanderH

(3 replies, posted in Ideas and feature requests)

Athletics1 wrote:

Hi Looking to stand away from the laptop and start / stop recording. The ambient noise is to high to use audio so looking to create a remote manual trigger. Anybody done this before as I am a new user and cannot find any reference to it anywhere. It would also appear you cannot set another key as your start / stop trigger, or have i missed something?

A very sipmle way is using a wireless mouse, blocking the IR at the bottom, placing the cursor manually on your start/stop buttin in Kinovea-> now you can take the mouse in your hand and use it as a remote to start&stop Kinovea recording....

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28 Reply by AlexanderH

(16 replies, posted in Ideas and feature requests)

If motion detection is needed, the software ZoneTrigger can be used to activate dedicated HotKeys to start the Kinovea recording. You will need two cameras; one for the trigger and an other for Kinovea....

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29 Reply by AlexanderH

(16 replies, posted in Ideas and feature requests)

fernando.morais wrote:

Are you sure it has to be fully automated? Why not have the judge/secretary just pressing a button to record?

That is probably the safest solution, pressing the button at the jump off the board, using a 1sec delayed buffer and 2sec automated recording. The clip has to be short to save the problem of scrolling through the footage.
The clip is immediately played in slo-mo at a second screen for both the judge and athlete to see, by sending it by the reply folder observer. If needed, it will be saved by the competitors number and jump.

It is a question of possible errors - missing the manual start or automated recording (not starting or recording at the wrong instance)...the sound activation was just too sensitive.

What resolution and FPS do you find necessary for this?

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30 Reply by AlexanderH

(16 replies, posted in Ideas and feature requests)

Nice. I have been looking around for WebCam Surveillance software (motion detection) that save to the disk. The resolution, FPS and lag make the inferior so far......

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