1,096 Reply by joan

(1 replies, posted in Bug reports)

First of all, just in case it works in your scenario, you can save the analysis data independently from the video itself. This is the preferred way to go in new versions. Save the analysis in a separate kva file, and use the original footage. The data will be loaded back when reopening the file in Kinovea.
Saving the video itself should only be used for export, for example to upload to youtube or something. Even if it's to share with someone, it's better to send the original video and the .kva file separately.

If this is not possible, try to convert the original video to another format in a conversion software first. (VLC may be able to do it for example). I think the issue with saving is only on certain input formats (mp4 ?) so converting it first to mpeg or avi might fix the problem.

You can also try with the experimental version 0.8.17, although I doubt it will fix the issue, it's more recent and the player has been improved. It also has logs enabled by default, so it'll be easier to diagnose the problem.
(However the data format has changed, so work you do on 0.8.17 may not be entirely read back in 0.8.15)

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1,097 Reply by joan

(26 replies, posted in General)

marchello wrote:

1. Question.: I'm using GPS logger. And i would like to put the "speed" datas and the video together. So i want to see the video and actual speed in the same time. I'm using kinovea for skiing. Anyone any idea, how could i do that? If its not possible with Kinovea than some other program?

Sorry for being so late to reply.
Do you (or someone else interested in this) have a sample file of the data output by the GPS logger ?
I can't promise anything but the ability to import data logs to overlay and synchronize them on the video is a recurring request.

Actually even better would be if someone could study the various formats existing, if there is a de facto standard, if there is utilities to convert between them, if there is a generic format for data logs outside of GPS theme, etc.

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1,098 Reply by joan

(3 replies, posted in General)

Great stuff !
Thanks for sharing big_smile

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1,099 Reply by joan

(1 replies, posted in Bug reports)

Thanks, I reproduce the problem. The code that deactivates the keyboard handling is only run when the dialog pops up, I'll see what can be done.

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1,100 Reply by joan

(7 replies, posted in Bug reports)

The original issue (in this thread at least) was due to a bug in the specific mode of saving where you save the analysis data embedded in the video file as a stream. If you didn't use this feature it must be a different issue. In the new versions, it's only possible to save the analysis as a separate file, partly to avoid this type of problems.

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1,101 Reply by joan

(7 replies, posted in Bug reports)

If the file is small, send it over (joan at kinovea dot org).
For info the ability to save the KVA embedded inside the MKV has been removed in further versions, it was causing more problems than solving.

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1,102 Reply by joan

(1 replies, posted in Français)

Bonjour,
Lors du tracking il y a un point ajouté par image, le taux d'échantillonnage est donc équivalent au nombre d'images par seconde de la vidéo.
(Si j'ai bien compris la question)

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1,103 Reply by joan

(5 replies, posted in Ideas and feature requests)

Chas Tennis wrote:

In your example, is the analyst manually identifying the blurry ball images and placing a marker?  So that with given a set of sparse markers with some missing frames a track is to be placed?

Yes. For cases when the video quality is insufficient and can't be improved.
It wouldn't be a track in the same sense as the track tool though, just a curve spanning multiple frames.

What doesn't satisfy me entirely with rebuilding the curve from chronological order, is that it will be very specific to this type of problem. Wouldn't be able to connect dots on the same image for example, while that might be useful in some other instances.
I can't think of a simpler way to express the order in which the curve should be built…

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1,104 Topic by joan

(5 replies, posted in Ideas and feature requests)

I'm looking at a Squash video, and trying to visualize the ball trajectory.

The ball is going too fast for the camera it was filmed with, so on some frames it's so blurred it's not visible at all. The trajectory tool, even in full manual mode, cannot really be used because of this.
Putting some cross markers doesn't really do what I need, as it doesn't nicely show the ball trajectory.

I think what would be nice is a way to reconstruct a curve from a set of sparse points. A sort of "connect the dots" feature. That would work even if the points sequence misses several frames in a row.
One way to do it would be to connect the markers by chronological order. (Triggered by a right click menu on any marker maybe). For example it could connect all the markers of a specific color, so as to allow several such reconstructed lines in the same sequence.
Another way would be to have a dedicated tool maybe.

Please add your input.
Did you ever found yourself in similar situation ? What do you think would be a sensible way to handle it ?

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1,105 Reply by joan

(11 replies, posted in Ideas and feature requests)

Considering the general case where the lines supporting the two segments are secant, even if it's outside the view. The crossing creates 4 angles, (only two different values).
The problems are, how does the user choose which of these angles to display, and where to display it. Each segment can be anywhere relatively to the other, so the positioning of the angle is not straightforward… crossing can be inside the view or not.

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1,106 Reply by joan

(11 replies, posted in Ideas and feature requests)

jonh wrote:

The horizontal/vertical measuring tool is an excellent tool if I am looking for lets say the horizontal distance between 2 points that may not be the same distance above the ground or for instance for stride length, where I don't want to measure the path travelled but only the distance over the ground, see image.

Ok. If I try to generalize, what you are measuring is the projection of both hooves on a projection plane, the ground. If the ground was tilted (for example a runner on an inclined treadmill), the whole figure would be at an angle. If this is correct it might be more powerful to have this as a rectangle that you can orient, the base being aligned with the projection plane and the interesting points aligned somewhere along the sides of the rectangle.
If possible/desirable, something like this:
http://www.kinovea.org/screencaps/0.8.x/projectedmeasure.png
(blue cross are the interest points, and the line with arrows would be the measurement line and would only be allowed to slide perpendicularly to the base plane).
Just a quick schema though, not worth it if it adds unnecessary complexity for user.

jonh wrote:

For the angle between 2 lines tool the other package I have used has a button for this tool which puts 2 lines onto the screen with the angle between them already calculated, you can then drag the end of these lines to the points you require & the value changes in real time.

What would be the best place to display the angle ?

Also, how to resolve the ambiguity:
http://www.kinovea.org/screencaps/0.8.x/nonsecantangle.png

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1,107 Reply by joan

(11 replies, posted in Ideas and feature requests)

Hello,
The next version will be focused on drawing tools.

jonh wrote:

- measure horizontally/vertically from a base line I can draw myself

Can you give more details on that please, what is the scenario ?

jonh wrote:

- measure the angle between 2 unrelated lines

This would be interesting but not sure how to interface with user. (How to specify the 2 lines, where to display the angle). Maybe as a special tool.
Please also give usage scenario or expected user interactions.

jonh wrote:

- overlay 2 still images made partially transparent

Check the image tool from menu Image > Observational reference > Import image…
Then right click the image and change opacity.

jonh wrote:

- ability to export into open office writer type document

There are some plans for a "rich" export with key images, comments and all, but currently there is no time to do it right, so it's on hold.

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1,108 Reply by joan

(2 replies, posted in Cameras and hardware)

Are you indoors ? I think he PSEye webcam needs a lot of light, otherwise the signal is quite noisy.

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1,109 Reply by joan

(2 replies, posted in Bug reports)

The basic scenario would be:
- Save the analysis in separate file (.kva).
- Send the .kva along with the video.

If the .kva has the same name as the video and is in the same folder, it will be loaded automatically in Kinovea when they open the video.
You do not need to re-encode or otherwise export the video, use the original file.

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1,110 Reply by joan

(26 replies, posted in General)

sven wrote:

Ok, but why is the lowest thickness setting 10px?

It's not, the small size is 2 pixels wide… But it gets scaled with the video. Are you sure you are not stretching a small video ?

edit: I'll add the 1px option back in the option list. I'm not sure why it's not there…

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