1,006 Reply by joan

(4 replies, posted in General)

Great !

The sad thing is that there actually was a similar feature in the ancestor of Kinovea back in 2005 (screencap from the help files). You could interactively add/remove positions to the composite.

In all those years I never got around to reimplementing it (Massive limitation : it worked only for perfectly fixed camera views. I want it to work even when there is camera motion, but it's much more involved).

Particularly interesting in the first images you posted is that the composition is selective. You see all the ball's positions, but only a few of the racket's ones. This makes for a much clearer image if all you want to see is the ball trajectory.

Go to forum: General

1,007 Reply by joan

(1 replies, posted in Cameras and hardware)

Hi,
I do not have a specific brand or model recommendation at the moment. Hopefully someone with practical experience can share.

Generally speaking, the camera must support MJPEG or JPEG over HTTP to work as it is currently the only formats implemented.
It's also possible to have WebcamXP receive the stream and serve it back locally in MJPEG for Kinovea consumption.

Go to forum: Cameras and hardware

1,008 Reply by joan

(1 replies, posted in Bug reports)

Hi,
I just tried and yes, you're right :-)

You need to set the .Owner property of the form to be the main Kinovea form for it to work properly.
If your menu handler is inside Kernel.cs, you can simply do this:

form.Owner = MainWindow;

If it's outside, in another module or elsewhere, you can call a similar function through this : 

using Kinovea.Services;

Form form = new Form ();
DelegatesPool dp = DelegatesPool.Instance();
if (dp.MakeTopMost != null)
    dp.MakeTopMost(form);
form.Show();

Go to forum: Bug reports

1,009 Reply by joan

(2 replies, posted in Cameras and hardware)

GoPro will not work. I've started to look into it for a future support but it's still a long shot.
I don't know about the liquid 727, but I'd be surprised if it worked.

Regarding the JVC, it should work if it indeed has an MJPEG stream. I can't guarantee that the framerate will be acceptable though, it will depend on the image size they use for the stream and the network bandwidth…

If someone has first hand experience with similar models, input would be much appreciated.

Go to forum: Cameras and hardware

1,010 Reply by joan

(3 replies, posted in Ideas and feature requests)

Interesting… The timestamp part might be covered by the existing naming scheme feature. Have you tried that ? From the capture tab in the main preferences you can have the snapshots named automatically with a timestamp. If it needs to have more precision it would probably be simple to integrate.

Then the second part would be to collect the list of files/timestamps in a text log, csv or spreadsheet file.
This could be done entirely in an external program I guess, monitoring the output directory and collecting info on the fly. Or it could be added as an internal feature, but it sort of feel a bit specific…

Another way that might be interesting would be to be able to define an external command to be executed after each snapshot is saved. That would leave the possibilities open and allow for many other uses. The external program would be fed the file name, time stamp and other variables as parameters.

It's more advanced on the user side and would need a bit of programming to get it working but we can probably create scripts for common scenarios as the requests come.

Go to forum: Ideas and feature requests

1,011 Reply by joan

(4 replies, posted in Ideas and feature requests)

Indeed this thread is initially about instrumenting playback with actions. I moved your message here.

Go to forum: Ideas and feature requests

1,012 Topic by joan

(3 replies, posted in Ideas and feature requests)

Giving this its own topic.

Alexander wrote:

I am not quite sure if this idea fits in here, but I would very much like to "time stamp" and save images from a streaming video.
Example: I am streaming a finish line of a crosscountry race. When competitors cross the line, I click and save an image with a running clock timestamp. All the timestamps are recorded in a file and can be opened later with Excel/OpenOffice etc. to match with corresponding images.
In this way I have a backup and documentation of the runners.

Go to forum: Ideas and feature requests

1,013 Reply by joan

(1 replies, posted in Bug reports)

Indeed the high speed camera setting has no effect on playback speed, it just changes the time base used to compute time values.

The resulting maximum reacheable framerate will depend on the bandwidth of the video (size of images and frames per second) and on the encoding format. The encoding has a great impact on the decoding time. If decoding + display cannot be done in less than the frame interval, frames are skipped. If this repeats constantly, the speed slider is automatically brought down.

In recent versions, the decoder tries to use the display size so that the image can be rendered without interpolation as fast as possible. Try to decrease the size of the image with the corner handles to see if it mitigates the problem.

Go to forum: Bug reports

1,014 Reply by joan

(4 replies, posted in Ideas and feature requests)

Welcome smile

Yes, you're correct. You can only save the piece of video that you created, not the process of creation itself.
That would be an interesting one though, but you can also do that with a screen grabbing application like camstudio.

Go to forum: Ideas and feature requests

1,015 Reply by joan

(6 replies, posted in Ideas and feature requests)

Grouping would be definitely interesting. It'd also be interesting in the context of creating a custom tool out of existing ones. However at the moment it's still not planned for short term.
One question will be: how do you know if the user is dragging the mouse to create a selection or just trying to move the image around.

Regarding pencil tool, merging the pieces of the drawing would be easier to implement as a short term mitigation of the problem.

Regarding temporarily hiding a drawing or a group of drawings, how would you "unhide" it ?

Go to forum: Ideas and feature requests

1,016 Reply by joan

(3 replies, posted in Cameras and hardware)

@wumastah: Apparently there was an issue related to TV Capture cards recently fixed in the AForge library (that Kinovea uses to support DirectShow cameras). I'll try to integrate this for the next version.

@SteelAl: if you use the experimental version, try to get the log and send it by mail.
I do most of DirectShow testing with a Sony DCR-HC47 so it should definitely work.

Go to forum: Cameras and hardware

1,017 Reply by joan

(23 replies, posted in General)

The way it works for now is that each time you manually moves a point, it will reset the series of saved positions for this point. From that moment, it will start tracking the new point.

Go to forum: General

1,018 Reply by joan

(23 replies, posted in General)

niklas.quetri wrote:

i can't find it.....if you time and will can you please take a look at you computer and tell me? thanks

Hi,
First of all, you need the experimental version if it's not the case already.
Then check this topic : Experimental version - 0.8.18 for a visual description of the new toolbar.

Go to forum: General

1,019 Reply by joan

(6 replies, posted in Ideas and feature requests)

You make a very good point about the pencil tool. At the moment there is no secret function to fix the problem.

Holding down a key would be a solution but I'm not sure if it would be very convenient while drawing.

Another idea would be to automatically group the new pieces of the drawing with the existing pencil pieces of the same color on that image. So until you change color, or change key image, the pencil would be adding to the existing group. On a given image, all pencil pieces of a given color would actually be a single drawing.

Or be in this additive mode only until you switch to another tool. This would allow to have several groups of the same color.

Go to forum: Ideas and feature requests

1,020 Reply by joan

(6 replies, posted in General)

I just posted a more in depth article about measuring angles on the perspective grid.

Go to forum: General