Query I/O API backends registry

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

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_EXPORTS_W cv::String cv::videoio_registry::getBackendName

(

VideoCaptureAPIs

api

)

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

Parameters

api	backend ID (VideoCaptureAPIs)

getBackends()

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

(

)

Returns list of all available backends.

getCameraBackendPluginVersion()

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

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

getCameraBackends()

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

(

)

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

getStreamBackendPluginVersion()

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

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

getStreamBackends()

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

(

)

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

getWriterBackendPluginVersion()

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

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

getWriterBackends()

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

(

)

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

hasBackend()

CV_EXPORTS_W bool cv::videoio_registry::hasBackend

(

VideoCaptureAPIs

api

)

Returns true if backend is available.

isBackendBuiltIn()

CV_EXPORTS_W bool cv::videoio_registry::isBackendBuiltIn

(

VideoCaptureAPIs

api

)

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