Topic: 2 cameras acquisition using 120fps
thank you very much for creating KINOVEA. I’m aware of the tremendous work you and your team have done to create a program at this stage.
I’m using it now during some weeks and would like to share some experience, especially regarding the hardware I use with respect to the possible speed that can be reached.
I’ve build up a golf simulator at home, using KINOVEA and an adopted Inorkuo- Script.
The hardware has been selected to give enough speed for the desired processes.
All programs I use are 64bit (Windows, KINOVEA 8.27, VLC).
First, I tried 1 Kinovea using two acquisition windows. The frame rate was set to 120fps (delay mode, Kinovea display rate) and It worked, even with 120fps in both windows, but the processor peak load went up to 100% during video acquisition. The behavior that has been described by other users, that the recording speed is decreased by the system during acquisition, has not been observed. The system I use has the newest USB 3.1 Gen 2 controller and it seems to be that they give enough speed to acquire at the high frame rate of 120fps using 2 cameras. At acquisition, KINOVEA does not show any dropped frames and inspecting the video-file (MPEG) it is really recorded at 120fps.
As you mentioned to Waheeden, i switched using 2 Instances of KINOVEA in two separate directories (ZIP-Installation). Now, the load is evenly distributed to all 6 cores ab about 70-80% during acquisition.
However, the AutoIt-script is a little bit more complicated and the timing of the triggers (start-stop-recording) differs sometimes. It may be related to other processes inside windows. So far, I could not find the exact reason to that behavior.
The next step will be to use a monochrome BASLER camera that can acquire 330fps using the PYLON interface. However, the camera is still on the way.
Below, there are some thoughts and questions:
- Wheeden, Inorkuo and faultyclubs already pointed out, what the golfer community would like to have. I would like to emphasize this points.
- As you mention in another thread, a script language would be a very good extension to your program.
- Furthermore, to my impression it would be a very nice feature, to show a playback of the just acquired videos in separate windows that can be freely positioned on desktop or a second screen, adjusted by Rotation, Cropping and speed. To me it would be most interesting, to show a window as large as possible without any other features, due to the distance of the screen to the golfer of about 2m.
- using both cameras, the „smaller“ one (ELP) shows a much HIGHER „Bandwidth“-value in the title during acquisition. The value is about 10 times higher than the more demanding camera. I could not understand what the reason is. What does Bandwidth in this context really mean?
- On my PC starting KINOVEA 64bit needs about 10 seconds. Starting it on a Parallels machine on my MAC, it needs about 1 second. Is that due to the configuration of the cameras that are attached? At least, it is a very useful feature in the actual version, that the settings of the camera are restored. It reduces significantly the time to set up the system after restart.
- if using 2 acquisition windows in 1 KINOVEA, the arrow keys up/down (Delay-setting) exclusively have influence on the LEFT window. There is no chance to control the second RIGHT window using the keyboard.
- The capture history window is fine. However, I use a „file-delete older than minutes“ Function in the AutoIt-Script to reduce the amount of disk space (using a RAMDRIVE). Maybe, a synchronization of this window to the existing files on the disk would be helpful.
- In the 2 KINOVEA-setup, both KINOVEA-windows are used in resized position to fit the screen side-by-side. Is there any function available to fit the Video to the acquisition-window?
- The „buffer“ topic has already been mentioned by other users. It really would be helpful if the full speed of the camera can be used since using the buffer (delay-function)
- is there any possibility to create an overlay that is store simultaneously during acquisition? It would be helpful for a „quick check“ of the performed movement. I.e. „swaying“ during a golf-swing.
- is there any chance to set the shutter speed of the camera? I guess, using the PYLON interface it should be possible.
- would it be possible to rotate the video during ACQUISITION? I actual rotate the CAMERA 90° to better fit the golfer and use a rotate-command-line-option in VLC during playback.
- again the „delay feature“. It would be helpful, if the actual KINOVEA-window shows real-time but the acquisition will read the video from the buffer using the given delay.
MSI Z390 GAMING EDGE AC
with USB 3.1 Gen 2
16GB RAM Corsair 3000MHz
ELP 640x480 at 120fps, rolling shutter (I guess), UVC, Plug and Play, USB 2.0, MPEG
KAYETON (OV CMOS, exact type unknown), global shutter, 1280x720 at 120fps, UVC Plug and Play, USB 2.0, MPEG