Some pixels are shifted on the resulting frame

[a-petit]

Hello,

I'm testing fswebcam with a Logitech Webcam C930e on ubuntu 16.04 LTS.

Running :

fswebcam -r 1920x1080 --no-banner --no-title --jpeg 95 -d /dev/video1 /tmp/output.jpg -v

produce the following verbose log :

--- Opening /dev/video1...
Trying source module v4l2...
/dev/video1 opened.
src_v4l2_get_capability,87: /dev/video1 information:
src_v4l2_get_capability,88: cap.driver: "uvcvideo"
src_v4l2_get_capability,89: cap.card: "Logitech Webcam C930e"
src_v4l2_get_capability,90: cap.bus_info: "usb-0000:00:14.0-2"
src_v4l2_get_capability,91: cap.capabilities=0x84200001
src_v4l2_get_capability,92: - VIDEO_CAPTURE
src_v4l2_get_capability,103: - STREAMING
No input was specified, using the first.
src_v4l2_set_input,181: /dev/video1: Input 0 information:
src_v4l2_set_input,182: name = "Camera 1"
src_v4l2_set_input,183: type = 00000002
src_v4l2_set_input,185: - CAMERA
src_v4l2_set_input,186: audioset = 00000000
src_v4l2_set_input,187: tuner = 00000000
src_v4l2_set_input,188: status = 00000000
src_v4l2_set_pix_format,520: Device offers the following V4L2 pixel formats:
src_v4l2_set_pix_format,533: 0: [0x56595559] 'YUYV' (YUYV 4:2:2)
src_v4l2_set_pix_format,533: 1: [0x47504A4D] 'MJPG' (Motion-JPEG)
Using palette MJPEG
src_v4l2_set_mmap,672: mmap information:
src_v4l2_set_mmap,673: frames=4
src_v4l2_set_mmap,722: 0 length=4147200
src_v4l2_set_mmap,722: 1 length=4147200
src_v4l2_set_mmap,722: 2 length=4147200
src_v4l2_set_mmap,722: 3 length=4147200
--- Capturing frame...
Captured frame in 0.00 seconds.
--- Processing captured image...
Disabling banner.
Clearing title.
Setting output format to JPEG, quality 95
Writing JPEG image to '/tmp/output.jpg'.

Up to here everything looks fine but the output's pixels appears shifted :

Do someone have any idea of what's happening ?

On the same environmet, the webcam works fine with FFmpeg and web apps that make use of the device through navigator.

[mmiscool]

I am seeing this same problem on the raspberry pi.

I have used the options to skip frames and lowered the FPS but still get the image tearing.