1

(3 replies, posted in General)

I can't think of a way, but then again, I don't use Kinovea to output video-just to record real time commentary using OBS.

If no one comes forward with a solution, I would recommend to achieve this effect to import the current video into a video editor, and using that, it is a simple process of isolating a single frame and then changing the duration of that frame. There are many free video apps out there from the very simple (OpenShot) to the very complex but powerful (Davinci Resolve Free edition).

Good luck.

2

(2 replies, posted in General)

Why not do all the cutting using a video editor prior to bringing it into Kinovea? There are many free, and easy to use editors out there that would make short work of a game. Setup a watched folder in Kinovea, put all the clips into there and you have an editing assembly line.

I use OpenShot. It's free.

https://www.openshot.org

The stopwatch idea is excellent. I won't be using it for my purposes, but I'm sure others will find it especially useful.

3

(26 replies, posted in General)

An excellent upgrade Joan. Thank you for your continued efforts towards improving this already powerful software. Wish you had a Mac version. ;-)

That's the last thing a hard working, very intelligent developer who has made available the fruits of his labors to the community at large needs. I'm sorry for the extra work it takes for you to keep these losers at bay.

Is there a way you can do a site wide search for the hex code for transparent text to help quickly identify some of these bots? That may work for a few of them.

Perhaps you can enlist the help of some Kinovea users to help admin the site to assist in verifying account creation attempts?

Thank you for the work you do.

5

(1 replies, posted in General)

You're going to need to do some research on this yourself. There are plenty of answers in this forum to your question, not to mention reading through the manual.

Short answer is, you can import recorded video files and do your analysis that way. You're going to need do something to synchronize the two videos. Pulling videos live into Kinovea requires certain cameras and some experimentation, or certain machine vision cameras that Joan has created plugins for. I would imagine for darts, you're going to need a high speed camera that may surpass what webcams can achieve. The higher the resolution and fps, the more expensive the camera.

Good luck searching! It's a very powerful program.

6

(2 replies, posted in General)

The second one: YYYY.Minor

I have a lot of experience with vector drawing programs, and so don't find the need to use these simplistic graphics, but then again, perhaps coaches, analysts or kinesiologists don't have such a background. I like how Word allows one to search an online repository for images to include in documents, and see that as a more powerful upgrade for Kinovea, but I'm not the one putting in the long hours to integrate such functionality. :-)

8

(5 replies, posted in General)

I've just started using a high end video editor (DaVinci Resolve), and think video editing software might be one avenue you could consider. Resolve has some pretty robust tracking and stabilization features. They have a free version that might let you accomplish what you're looking for. I'll warn you, it's an imposingly deep piece of software.

Then again, there might be something in Kinovea but I've never needed this type of capability. Good luck in your search!

9

(4 replies, posted in General)

Could you let us know the resolution of the MP4? If you are on a Mac, Command + i in Finder will show you the Dimensions. On the PC, you should be able to right click and choose properties and see the dimensions there.

When you say regular player, are you talking about Microsoft Photos?

In Kinovea, there is an option to "zoom" into the video. Hold down Ctrl while scrolling the mouse wheel and pointing to the part of the video you want to zoom in on. It lets you magnify quite a substantial amount (600%). You can also hold down Ctrl and click on the NumPad + or - key.

But it sounds very odd that a modern phone would film a video that would have such, what sounds like, a low resolution.

10

(7 replies, posted in General)

Sorry for the time to respond. I have an iPhone 12 Max, and yes, it has those 3 zoom levels. It also has some incremental levels (click on the zoom level number on the screen, hold it down, and it will display a zoom "wheel" which you can incrementally drag up and down. I would caution against this though as I'm pretty sure those inter-settings are not optically based zoom - just digital, and the quality will suffer.

There are lots of cameras you can buy that cost significantly less than a new iPhone. Here are some places to being your search

Daheng (supported by Kinovea)
https://www.get-cameras.com/USB3.0-Came … 160-227U3C
These are the cheapest cameras, but are well made.

Basler (supported by Kinovea)
https://www.baslerweb.com/en/products/c … meras/ace/
Basler has a very nice search interface if you scroll down, where you can dial in the exact specs of what you are looking for. USB3 interface is ideal. Then, you can set your preference for FPS, sensor size, and resolution.

IDS (supported by Kinovea)
https://www.ids-imaging.us/store_us/pro … zGEALw_wcB
Another nice camera finder.
More expensive than Daheng, approximately comparable in price to Basler.

Keep in mind supply chain disruptions mean significant lead times for ordering. Some units are in stock, but you will pay significantly more. EdmundsOptics has a good selection of most industrial cameras...https://www.edmundoptics.com/c/cameras/1012/

I'm actually in the market for a couple cameras and could possibly purchase them from you after the project.

11

(7 replies, posted in General)

Great point Reiner, and you make a pertinent reference to the speed. Visual examples of rolling shutter normally include a helicopter, or fan blade - in other words, objects that are moving at a high rate of speed. In this case, the poster reports that the subject is going to be a cantering horse which a quick search will reveal it is between 10-17 mph. Do you think that's enough speed to cause rolling shutter issues? Perhaps 21000969 could use a short focal length (the iPhone max can do .5, 1.0, and 1.5x zoom) to ameliorate the effect?

12

(7 replies, posted in General)

The iPhone is definitely usable as a camera. It has numerous high speed settings, including Super Slo-Mo (240 fps @ 720p) and Slo-Mo (120 fps @ 1080p). You can also go down to 60 fps.

When you open the files, different programs will read different fps settings, but they will all be fractionally close to 240 and 120. I prefer hooking up my iPhone directly to my Mac, thereby using ImageCapture to download any images I want via a lightning to USB wire. It's much faster. You don't get a chance to specify a format when you upload them to your Mac. They will come as .MOV files, which are playable by most video players, and importable directly into Kinovea.

You will need to figure out some way to mount the camera. I've used this (https://www.amazon.com/AILUN-Rotatable- … amp;sr=8-9) and either mount it to a tripod, if you are clever enough, you can mount it to a tripod microphone stand which would give you some elevation.

This is most likely the best solution (especially if you already have an iPhone) for non-real time analysis.

If you want to go the real time route, you will need to look into machine vision/industrial cameras, 4 brands of which Joan has written plugins to support real time operation. Read more up here: https://www.kinovea.org/help/en/capture … trial.html

They start out at affordable, then go up to over $1,000. You'll need the body, a lens, and a certain amount of technical knowledge to use and install them - thus my recommendation for using the iPhone.

High Frames per second. Shutter control. Exposure control. Lots of high quality light (make sure you check these forums for the lighting users found that work well with high frame rates. I use Hykolity lights which put out bright, non-colored light that can freeze most motion (https://www.hykolity.com/collections/le … bay-lights). Best yet, they are affordably priced.

Best of luck with your dissertation!

13

(1 replies, posted in General)

Start with OBS Studio.

https://obsproject.com/

14

(2 replies, posted in General)

There is some discussion about OpenPose here: https://www.kinovea.org/en/forum/search … =403162028

I looked into this and spent an afternoon experimenting with it, but was disheartened to see that one can't modify the thickness of the lines produced by OP. They were simply too bulky looking for my requirements.

I believe the answer to your question is finished video. The processing requirements would be very heavy for real time.

15

(2 replies, posted in General)

Perfect! Thank you.