Logi capture manual8/19/2023 ![]() ![]() On the upside, when using the Logitech driver, it is possible to get and set the exposure duration with 100µs granularity, with a lowest value at 300µs.īoth drivers lie to some degree with the list of framerates they support. However there is a catch, the official Logitech driver provides the H.264 stream in an unusual way (on a secondary pin of the DirectShow filter), which makes it invisible to Kinovea and to the majority of DirectShow based capture applications. I haven't yet found what the actual native uncompressed format of the camera is. (These options will be available for selection in the next version). The Logitech driver provides RGB24, I420 (two uncompressed formats), MJPG and H264. The MS driver provides the stream in YUY2 (an uncompressed format), MJPG and H264. The Microsoft driver that installs itself by default, and the Logitech driver that must be installed manually. On Windows 7 there are two capable drivers giving slightly different options. I'll later see if it's possible to directly save the MJPEG stream to disk. ![]() However it means that the images have to be uncompressed on the computer to be displayed and then recompressed to save to disk. USB 2.0 doesn't have the bandwidth for uncompressed full HD 30 fps, so getting the compressed stream is the only way to get the top score. The camera has on-board compression and can stream to H.264 and MJPEG in addition to uncompressed.Īt the moment Kinovea only exposes the configurations options corresponding to the H.264 stream due to some underlying limitation that I'm working on lifting. I have started to change the code to get the full range of capabilities. The list of available image sizes / framerates is somewhat limited in the current versions of Kinovea. There seems to be a bug in the camera driver as it forgets the settings when you restart the streaming though. To get the full 30 fps you need to set exposure on manual (and maybe get powerful artificial lights). You don't want this.Įspecially if you are indoors, the exposure will set itself to longer values, automatically decreasing the framerate. As the exposure and framerate are partly interdependent, it may also alter the framerate. If you leave the exposure control on automatic, the exposure duration will adjust to the light conditions. They do have a lower level API where it's possible to set the duration by increments of 100µs, so I'll try to use that at some point in the future. The mapping between the settings and actual durations is not published by Logitech though, and there are conflicting informations between the DirectShow spec and Logitech. I think the Logitech software also has a page where you can change it. To change the exposure time you have to go into the device property pages and to Camera control. Combined with the HD frame size and the 30 fps it makes it a very interesting tool indeed. Extremely important for sport video as we already discussed in the forum. The camera has a setting for exposure duration which is great. I'll keep in mind the holy grail of the thread, being able to record and preview two C920 at their full 1920×1080 30 fps, simultaneously. Let's make this the official Logitech C920 thread, and everyone should post their findings or issues with this camera. So I got my C920 earlier this week and I've started experimenting with it. ![]()
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