Query I/O API backends registry

Functions
cv::String	cv::videoio_registry::getBackendName (VideoCaptureAPIs api)
	Returns backend API name or "UnknownVideoAPI(xxx)". More...
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getBackends ()
	Returns list of all available backends. More...
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getCameraBackends ()
	Returns list of available backends which works via cv::VideoCapture(int index) More...
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getStreamBackends ()
	Returns list of available backends which works via cv::VideoCapture(filename) More...
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getWriterBackends ()
	Returns list of available backends which works via cv::VideoWriter() More...
bool	cv::videoio_registry::hasBackend (VideoCaptureAPIs api)
	Returns true if backend is available. More...

Detailed Description

This section contains API description how to query/configure available Video I/O backends.

Runtime configuration options:

• enable debug mode: OPENCV_VIDEOIO_DEBUG=1
• change backend priority: OPENCV_VIDEOIO_PRIORITY_<backend>=9999
• disable backend: OPENCV_VIDEOIO_PRIORITY_<backend>=0
• specify list of backends with high priority (>100000): OPENCV_VIDEOIO_PRIORITY_LIST=FFMPEG,GSTREAMER

Function Documentation

getBackendName()

cv::String cv::videoio_registry::getBackendName

(

VideoCaptureAPIs

api

)

Python:
	retval	=	cv.videoio_registry.getBackendName(	api	)

#include <opencv2/videoio/registry.hpp>

Returns backend API name or "UnknownVideoAPI(xxx)".

Parameters

api	backend ID (VideoCaptureAPIs)

getBackends()

std::vector<VideoCaptureAPIs> cv::videoio_registry::getBackends

(

)

Python:
	retval	=	cv.videoio_registry.getBackends(		)

#include <opencv2/videoio/registry.hpp>

Returns list of all available backends.

getCameraBackends()

std::vector<VideoCaptureAPIs> cv::videoio_registry::getCameraBackends

(

)

Python:
	retval	=	cv.videoio_registry.getCameraBackends(		)

#include <opencv2/videoio/registry.hpp>

Returns list of available backends which works via cv::VideoCapture(int index)

getStreamBackends()

std::vector<VideoCaptureAPIs> cv::videoio_registry::getStreamBackends

(

)

Python:
	retval	=	cv.videoio_registry.getStreamBackends(		)

#include <opencv2/videoio/registry.hpp>

Returns list of available backends which works via cv::VideoCapture(filename)

getWriterBackends()

std::vector<VideoCaptureAPIs> cv::videoio_registry::getWriterBackends

(

)

Python:
	retval	=	cv.videoio_registry.getWriterBackends(		)

#include <opencv2/videoio/registry.hpp>

Returns list of available backends which works via cv::VideoWriter()

hasBackend()

bool cv::videoio_registry::hasBackend

(

VideoCaptureAPIs

api

)

#include <opencv2/videoio/registry.hpp>

Returns true if backend is available.