Extract specific frames of youtube video without downloading video Question: I need to extract specific frames of an online video to work on an algorithm but I don’t want to download the whole video because that would make it highly inefficient. For starters, I tried working with youtube videos. I can download whole of the …
How to explicitly access mjpeg backend for videocapture in opencv Question: When I execute following: availableBackends = [cv2.videoio_registry.getBackendName(b) for b in cv2.videoio_registry.getBackends()] print(availableBackends) I get [‘FFMPEG’, ‘GSTREAMER’, ‘INTEL_MFX’, ‘V4L2’, ‘CV_IMAGES’, ‘CV_MJPEG’]. If I now try: print(cv2.CAP_FFMPEG) print(cv2.CAP_GSTREAMER) print(cv2.CAP_INTEL_MFX) print(cv2.CAP_V4L2) print(cv2.CAP_IMAGES) print(cv2.CAP_MJPEG) all work except the last one: AttributeError: module ‘cv2.cv2’ has no attribute ‘CAP_MJPEG’ How …
OpenCV real time streaming video capture is slow. How to drop frames or get synced with real time? Question: Goal and problem I’d like to set up an opencv system to process either HLS streams or RMTP streams, however, I am running into a strange issue regarding a reduced frame-rate and an accumulating lag. It’s …
How to get the latest frame from capture device (camera) in opencv Question: I want to connect to a camera, and only capture a frame when an event happens (e.g. keypress). A simplified version of what I’d like to do is this: cap = cv2.VideoCapture(device_id) while True: if event: img = cap.read() preprocess(img) process(img) cv.Waitkey(10) …
conversion from opencv image to jpeg image in python Question: I’m grabbing frames from a video file as following: def capture_frame(file): capture = cv.CaptureFromFile(“video.mp4”) cv.GetCaptureProperty(capture, cv.CV_CAP_PROP_POS_MSEC) cv.SetCaptureProperty(capture, cv.CV_CAP_PROP_POS_MSEC, 90000) frame = cv.QueryFrame(capture) return frame The frame type is cv2.cv.iplimage. How can I convert this type of image to jpeg image without saving? Thanks, Asked By: …
How to extract slides from a video using python Question: I have a video training course supplied as AVI files. Most of the screens are shown as slides with a mouse pointer moving around on them. I’d like to capture a screenshot of the slide automatically when the screen changes (ignoring when the image changes …
How to capture pygame screen? Question: How can I capture and save a sequence of images or a video of a pygame screen? Basically I want to share my game video on youtube. Also, want to make a tutorial. The game is rendered mainly in a loop: def main(): while True: GetInput() Move() Shift() Draw() …
