I haven’t used it yet but I would take a look at http://www.zoneminder.com/ The documentation explains you can install it on a modest machine with linux and use IP cameras for remote recording. Andrew
I think the solution mentioned in the question, namely having a separate thread that clears the buffer, is the easiest non-brittle solution for this. Here reasonably nice (I think) code for this: import cv2, queue, threading, time # bufferless VideoCapture class VideoCapture: def __init__(self, name): self.cap = cv2.VideoCapture(name) self.q = queue.Queue() t = threading.Thread(target=self._reader) t.daemon … Read more
I got the same error. Try changing 0 to -1 cap = cv2.VideoCapture(-1) This solved the issue.
Virtual webcam is typically a software only implementation that application discover as if it is a device with physical representation. The mentioned applications use APIs to work with web cameras and ability to extend the APIs and add your own video source is the way to create a virtual web camera. In Windows there are … Read more
My hypothesis is that the jitter is most likely due to network limitations and occurs when a frame packet is dropped. When a frame is dropped, this causes the program to display the last “good” frame which results in the display freezing. This is probably a hardware or bandwidth issue but we can alleviate some … Read more
I can’t answer the specific question put, but I’ve been successfully recording video and grabbing frames at the same time using: AVCaptureSession and AVCaptureVideoDataOutput to route frames into my own code AVAssetWriter, AVAssetWriterInput and AVAssetWriterInputPixelBufferAdaptor to write frames out to an H.264 encoded movie file That’s without investigating audio. I end up getting CMSampleBuffers from … Read more
I’ve had success in Python 3 using a simple counter and setting the capture to that counter’s frame, as follows: import cv2 cap = cv2.VideoCapture(‘XYZ.avi’) # For streams: # cap = cv2.VideoCapture(‘rtsp://url.to.stream/media.amqp’) # Or e.g. most common ID for webcams: # cap = cv2.VideoCapture(0) count = 0 while cap.isOpened(): ret, frame = cap.read() if ret: … Read more
Answer: No. There is no single library/solution in python to do video/audio recording simultaneously. You have to implement both separately and merge the audio and video signal in a smart way to end up with a video/audio file. I got a solution for the problem you present. My code addresses your three issues: Records video … Read more
Master copy Lossless – HUFFYUV in AVI is a good option. Lossy – MJPEG (series of JPEG) in AVI is a good option, where each frame will be independently encoded. The editing will be faster. Distribution Video codec – Use either H.264 video (not free) or VP8 (free video codec by Google). You should use … Read more
Translated with some edits from: First frame of a video using AVFoundation var err: NSError? = nil let asset = AVURLAsset(URL: NSURL(fileURLWithPath: “/that/long/path”), options: nil) let imgGenerator = AVAssetImageGenerator(asset: asset) let cgImage = imgGenerator.copyCGImageAtTime(CMTimeMake(0, 1), actualTime: nil, error: &err) // !! check the error before proceeding let uiImage = UIImage(CGImage: cgImage) let imageView = UIImageView(image: … Read more