[kinovea-dev] Re: Save dual video
- From: Erik Larsson <karl.erik.larsson@xxxxxxxxx>
- To: kinovea-dev@xxxxxxxxxxxxx
- Date: Tue, 2 Feb 2010 14:26:12 +0100
When I stared to work with this I had problem with exporting the video.
After a while I realized that the video aspect ratio was a problem. When I
realized that my coding time was up :-(
I will start looking a bit on some sort of helper function/class for
combining images. You are right that frame rate and video size need to me
taken into concern, but thats not rocket science too solve that.
GUI:
I did the GUI just like you sad, putting the export buttons to the right in
the common-controls. Maybe the GUI should be changed a bit because it's
starting to get very many button. Why not just make one
export-drop-down-button. When clicking at it a export menu will show.
/Erik
2010/2/2 <joan@xxxxxxxxxxx>
> On Tue, 02 Feb 2010 13:31:52 +0100, <joan@xxxxxxxxxxx> wrote:
>
> The tricky parts would be :
>
> 1 - keeping the user's synchronisation point, so the final video is exactly
> what he was looking at.
>
> I don't know how we can do this since currently each screen has its own
> VideoFile object and doesn't know about the other one. The saving will
> probably have to be piloted from the ScreenManager itself. What was your
> approach to retrieve the other video images?
>
> 2 - what do we do of key image data?
>
> I think we shouldn't provide the option of multiplexing the .kva XML data
> into the file. Exporting to dual video is much like exporting with variable
> duration on key images and other special export. The output will probably be
> used as-is, and not as a working file.
>
> So basically, for a start at least, we may burn the drawings on the frames
> definitely. When the user will click the button for this new Dual Save
> export, he will directly be forwarded to the save file dialog.
>
>
>
> Oh, and the videos could also have different dimensions and different image
> aspect ratios.
>
> To solve this issue, we could use the biggest image size as the target size
> and adapt the smaller one to fit its half of the image, keeping ratio. So if
> we have one video 640×480 (4:3) and the other is 720×576 (5:4), the first
> one would have to be stretched into 720×540, and will have black stripes on
> the sides.
>
> All in all, we should probably have a helper function that takes two images
> and give back a single combined image. This way we can directly use this
> function for the simple combined snapshot feature.
>
> For the case of video that have different frame rate, we'll have to choose
> the frame rate of one the two. (and the synchronisation engine should
> provide the right corresponding image for each position).
>
Other related posts:
