video of the webcam seems tense on Mac

Hello

in some cases, we found that the image of a webcam seems tense when you use a webcam on a mac. In my case, I used a Logitech C910 (which certainly supports 16:9 resolutions) on a Mac running Mac OS X 10.6.8.

In my project, I want to show a video webcam in 16 / 9 but want to switch between camera resolutions different 16:9 (480 x 270, 320 x 180, 640 x 360). In Windows, each resolution of the camera sounds good - nothing is stretched. You can check if the image is stretched or not the best holding a round Cup in front of his webcam and check whether it is still round in the video. But when you use a Mac, the video of the webcam seems to sometimes tense. The cut is more round.

I built a small test application running at http://interactive-pioneers.com/camTest/. It shows three different webcam shows: on the left hand side always resize the video resolution, width and height defined in the drop-down list (4:3 and 16:9). The video in the Middle will always be 16:9 with a fixed size of 320 x 180. The video on the right side will always be 4:3 with a fixed size of 320 x 240. Whenever you change the drop-down list, the size of the webcam will be updated via camera.setMode.

Under Windows, everything works as expected:

-video on the left: Cup is always round, no stretch

-video at the Center: cutting is always round every time that a 16:9 resolution is chosen. Cup is stretched vertically whenever a 4:3 resolution is chosen

-video right: cutting is always round every time that a 4:3 resolution is chosen. Cup is stretched horizontally whenever a 16:9 resolution is chosen

It's what I expected totally. It is logical.

But not on a Mac:

-video on the left: Cup is round for 320 x 240 (4:3), 320 x 180 (16:9) and 640 x 480 (4:3). She is stretched vertically for 480 x 360 (4:3) and 480 x 270 (16:9). It is stretched horizontally to 640 x 360 (16:9). It makes no sense to me. It should be round in all cases as it does under Windows.

-video at the Center: Cup is round for 320 x 180 (16:9) and 480 x 360 (4:3). She is stretched vertically to 480 x 270 (16:9). It is stretched horizontally to all other resolutions. It would make sense that the Cup is round for all resolutions of 16:9 as well as Windows.

-video right: Cup is round for 320 x 240 (4:3), 640 x 480 (4:3) and 640 x 360 (16:9). She is stretched vertically for all other resolutions. It would make sense that the Cup is round for all 4:3 as well as Windows resolutions.

Due to this test result, I'm not able to show a 16:9 video on Mac webcam which is not stretched in some resolutions of 16:9.

Is it possible to get around this problem?

You can find the screenshots with the Cup here: http://interactive-pioneers.com/camTest/cam_squeeze_images.zip

Thanks for your help.

Malta

The driver and the camera are certainly responsible. The work of pilots is to validate the incoming request for a resolution against the cameras features and a food that is as close as possible to the he hand. The camera is clearly send a stream. What we cannot say if it's the driver or the camera. Installation of the Logitech driver, even temporarily, can solve this issue.

If it's the driver, then when you ask for a resolution, it checks the capabilities of the camera and most likely Gets the next highest resolution, it extends to your request and sends it back.

If it's the camera, then she does something very similar. The pilot did a request for resolution, the camera knows he does not support this resolution and sends something higher awaits the driver to "solve" the problem, but the UVC driver blindly returns data to the requested resolution.

Usually always install you the driver under windows and/or there is already one that is completely capable installed by default, you always receive the best experience.

Good luck!

Tags: Adobe Animate

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