Query I/O API backends registry

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

Functions
cv::String	cv::videoio_registry::getBackendName (VideoCaptureAPIs api)
	Returns backend API name or "UnknownVideoAPI(xxx)".
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getBackends ()
	Returns list of all available backends.
std::string	cv::videoio_registry::getCameraBackendPluginVersion (VideoCaptureAPIs api, int &version_ABI, int &version_API)
	Returns description and ABI/API version of videoio plugin's camera interface.
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getCameraBackends ()
	Returns list of available backends which works via cv::VideoCapture(int index)
std::string	cv::videoio_registry::getStreamBackendPluginVersion (VideoCaptureAPIs api, int &version_ABI, int &version_API)
	Returns description and ABI/API version of videoio plugin's stream capture interface.
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getStreamBackends ()
	Returns list of available backends which works via cv::VideoCapture(filename)
std::string	cv::videoio_registry::getWriterBackendPluginVersion (VideoCaptureAPIs api, int &version_ABI, int &version_API)
	Returns description and ABI/API version of videoio plugin's writer interface.
std::vector< VideoCaptureAPIs >	cv::videoio_registry::getWriterBackends ()
	Returns list of available backends which works via cv::VideoWriter()
bool	cv::videoio_registry::hasBackend (VideoCaptureAPIs api)
	Returns true if backend is available.
bool	cv::videoio_registry::isBackendBuiltIn (VideoCaptureAPIs api)
	Returns true if backend is built in (false if backend is used as plugin)

Function Documentation

getBackendName()

cv::String cv::videoio_registry::getBackendName

(

VideoCaptureAPIs

api

)

Python:
	cv.videoio_registry.getBackendName(	api	) ->	retval

#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:
	cv.videoio_registry.getBackends(		) ->	retval

#include <opencv2/videoio/registry.hpp>

Returns list of all available backends.

getCameraBackendPluginVersion()

std::string cv::videoio_registry::getCameraBackendPluginVersion	(	VideoCaptureAPIs	api,
		int &	version_ABI,
		int &	version_API )

Python:
	cv.videoio_registry.getCameraBackendPluginVersion(	api	) ->	retval, version_ABI, version_API

#include <opencv2/videoio/registry.hpp>

Returns description and ABI/API version of videoio plugin's camera interface.

getCameraBackends()

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

(

)

Python:
	cv.videoio_registry.getCameraBackends(		) ->	retval

#include <opencv2/videoio/registry.hpp>

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

getStreamBackendPluginVersion()

std::string cv::videoio_registry::getStreamBackendPluginVersion	(	VideoCaptureAPIs	api,
		int &	version_ABI,
		int &	version_API )

Python:
	cv.videoio_registry.getStreamBackendPluginVersion(	api	) ->	retval, version_ABI, version_API

#include <opencv2/videoio/registry.hpp>

Returns description and ABI/API version of videoio plugin's stream capture interface.

getStreamBackends()

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

(

)

Python:
	cv.videoio_registry.getStreamBackends(		) ->	retval

#include <opencv2/videoio/registry.hpp>

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

getWriterBackendPluginVersion()

std::string cv::videoio_registry::getWriterBackendPluginVersion	(	VideoCaptureAPIs	api,
		int &	version_ABI,
		int &	version_API )

Python:
	cv.videoio_registry.getWriterBackendPluginVersion(	api	) ->	retval, version_ABI, version_API

#include <opencv2/videoio/registry.hpp>

Returns description and ABI/API version of videoio plugin's writer interface.

getWriterBackends()

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

(

)

Python:
	cv.videoio_registry.getWriterBackends(		) ->	retval

#include <opencv2/videoio/registry.hpp>

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

hasBackend()

bool cv::videoio_registry::hasBackend

(

VideoCaptureAPIs

api

)

Python:
	cv.videoio_registry.hasBackend(	api	) ->	retval

#include <opencv2/videoio/registry.hpp>

Returns true if backend is available.

isBackendBuiltIn()

bool cv::videoio_registry::isBackendBuiltIn

(

VideoCaptureAPIs

api

)

Python:
	cv.videoio_registry.isBackendBuiltIn(	api	) ->	retval

#include <opencv2/videoio/registry.hpp>

Returns true if backend is built in (false if backend is used as plugin)