video-capture

问题 everybody. I'm trying to place ".png" image over the video capture using java and opencv. I performed the tutorial from the official opencv java website http://opencv-java-tutorials.readthedocs.io/en/latest/04-opencv-basics.html In this tutorial everything works fine with png image from the tutorial. But when i try to load my own png image with alpha channel, i get the wrong result. Png image displays with white spaces. Here is the print screens of video capture with both images: correct

问题 everybody. I'm trying to place ".png" image over the video capture using java and opencv. I performed the tutorial from the official opencv java website http://opencv-java-tutorials.readthedocs.io/en/latest/04-opencv-basics.html In this tutorial everything works fine with png image from the tutorial. But when i try to load my own png image with alpha channel, i get the wrong result. Png image displays with white spaces. Here is the print screens of video capture with both images: correct

问题 I have a camera on my linuxbox it is working well: # $ ls -al /dev/video* # crw-rw----+ 1 root video 81, 0 janv. 8 16:13 /dev/video0 # crw-rw----+ 1 root video 81, 1 janv. 8 16:13 /dev/video1 # $ groups # adm cdrom sudo dip video plugdev lpadmin lxd sambashare docker libvirt From python with cv2 it work well with the default driver CAP_V4L2 >>> from pathlib import Path >>> import cv2 >>> print(cv2.VideoCapture(0, apiPreference=cv2.cv2.CAP_V4L2).isOpened()) True >>> I would like to access it

问题 I am trying to read frames of a video leveraging a multithreading class. So, there is a while loop inside the class, which keeps reading the video. And there is a while loop in the main, which accesses the frames from the variables of that class, but what I found is, the outer while has no control over the inner while. It is just grabbing the current running frame from the inner while. To experiment, I put a sleep and saw the loss of frames. I do not want that, I want the outer loop to get

问题 I am trying to read frames of a video leveraging a multithreading class. So, there is a while loop inside the class, which keeps reading the video. And there is a while loop in the main, which accesses the frames from the variables of that class, but what I found is, the outer while has no control over the inner while. It is just grabbing the current running frame from the inner while. To experiment, I put a sleep and saw the loss of frames. I do not want that, I want the outer loop to get

问题 I am trying to read frames of a video leveraging a multithreading class. So, there is a while loop inside the class, which keeps reading the video. And there is a while loop in the main, which accesses the frames from the variables of that class, but what I found is, the outer while has no control over the inner while. It is just grabbing the current running frame from the inner while. To experiment, I put a sleep and saw the loss of frames. I do not want that, I want the outer loop to get

问题 Does anyone know when the App Store started requiring the app previews to be on a physical device and show this pop-up? Even when I mirror my iPhone Xs to my Mac, the pop-up does not show. If no pop-up on video, app store rejects app preview. Anyone know of a better way to get around this issue? Another image that shows issue: This pop-up NEVER shows on screen recording or mirroring.... 回答1: We have same problem. You have two options: You can record the screen from another mobile or camera

问题 Does anyone know when the App Store started requiring the app previews to be on a physical device and show this pop-up? Even when I mirror my iPhone Xs to my Mac, the pop-up does not show. If no pop-up on video, app store rejects app preview. Anyone know of a better way to get around this issue? Another image that shows issue: This pop-up NEVER shows on screen recording or mirroring.... 回答1: We have same problem. You have two options: You can record the screen from another mobile or camera

问题 Does anyone know when the App Store started requiring the app previews to be on a physical device and show this pop-up? Even when I mirror my iPhone Xs to my Mac, the pop-up does not show. If no pop-up on video, app store rejects app preview. Anyone know of a better way to get around this issue? Another image that shows issue: This pop-up NEVER shows on screen recording or mirroring.... 回答1: We have same problem. You have two options: You can record the screen from another mobile or camera

问题 Does anyone know when the App Store started requiring the app previews to be on a physical device and show this pop-up? Even when I mirror my iPhone Xs to my Mac, the pop-up does not show. If no pop-up on video, app store rejects app preview. Anyone know of a better way to get around this issue? Another image that shows issue: This pop-up NEVER shows on screen recording or mirroring.... 回答1: We have same problem. You have two options: You can record the screen from another mobile or camera