OpenCV  4.0.0-pre
Open Source Computer Vision
Enumerations
Flags for video I/O

Enumerations

enum  cv::VideoCaptureAPIs {
  cv::CAP_ANY = 0,
  cv::CAP_VFW = 200,
  cv::CAP_V4L = 200,
  cv::CAP_V4L2 = CAP_V4L,
  cv::CAP_FIREWIRE = 300,
  cv::CAP_FIREWARE = CAP_FIREWIRE,
  cv::CAP_IEEE1394 = CAP_FIREWIRE,
  cv::CAP_DC1394 = CAP_FIREWIRE,
  cv::CAP_CMU1394 = CAP_FIREWIRE,
  cv::CAP_QT = 500,
  cv::CAP_UNICAP = 600,
  cv::CAP_DSHOW = 700,
  cv::CAP_PVAPI = 800,
  cv::CAP_OPENNI = 900,
  cv::CAP_OPENNI_ASUS = 910,
  cv::CAP_ANDROID = 1000,
  cv::CAP_XIAPI = 1100,
  cv::CAP_AVFOUNDATION = 1200,
  cv::CAP_GIGANETIX = 1300,
  cv::CAP_MSMF = 1400,
  cv::CAP_WINRT = 1410,
  cv::CAP_INTELPERC = 1500,
  cv::CAP_OPENNI2 = 1600,
  cv::CAP_OPENNI2_ASUS = 1610,
  cv::CAP_GPHOTO2 = 1700,
  cv::CAP_GSTREAMER = 1800,
  cv::CAP_FFMPEG = 1900,
  cv::CAP_IMAGES = 2000,
  cv::CAP_ARAVIS = 2100,
  cv::CAP_OPENCV_MJPEG = 2200,
  cv::CAP_INTEL_MFX = 2300,
  cv::CAP_XINE = 2400
}
 VideoCapture API backends identifier. More...
 
enum  cv::VideoCaptureModes {
  cv::CAP_MODE_BGR = 0,
  cv::CAP_MODE_RGB = 1,
  cv::CAP_MODE_GRAY = 2,
  cv::CAP_MODE_YUYV = 3
}
 Generic camera output modes identifier. More...
 
enum  cv::VideoCaptureProperties {
  cv::CAP_PROP_POS_MSEC =0,
  cv::CAP_PROP_POS_FRAMES =1,
  cv::CAP_PROP_POS_AVI_RATIO =2,
  cv::CAP_PROP_FRAME_WIDTH =3,
  cv::CAP_PROP_FRAME_HEIGHT =4,
  cv::CAP_PROP_FPS =5,
  cv::CAP_PROP_FOURCC =6,
  cv::CAP_PROP_FRAME_COUNT =7,
  cv::CAP_PROP_FORMAT =8,
  cv::CAP_PROP_MODE =9,
  cv::CAP_PROP_BRIGHTNESS =10,
  cv::CAP_PROP_CONTRAST =11,
  cv::CAP_PROP_SATURATION =12,
  cv::CAP_PROP_HUE =13,
  cv::CAP_PROP_GAIN =14,
  cv::CAP_PROP_EXPOSURE =15,
  cv::CAP_PROP_CONVERT_RGB =16,
  cv::CAP_PROP_WHITE_BALANCE_BLUE_U =17,
  cv::CAP_PROP_RECTIFICATION =18,
  cv::CAP_PROP_MONOCHROME =19,
  cv::CAP_PROP_SHARPNESS =20,
  cv::CAP_PROP_AUTO_EXPOSURE =21,
  cv::CAP_PROP_GAMMA =22,
  cv::CAP_PROP_TEMPERATURE =23,
  cv::CAP_PROP_TRIGGER =24,
  cv::CAP_PROP_TRIGGER_DELAY =25,
  cv::CAP_PROP_WHITE_BALANCE_RED_V =26,
  cv::CAP_PROP_ZOOM =27,
  cv::CAP_PROP_FOCUS =28,
  cv::CAP_PROP_GUID =29,
  cv::CAP_PROP_ISO_SPEED =30,
  cv::CAP_PROP_BACKLIGHT =32,
  cv::CAP_PROP_PAN =33,
  cv::CAP_PROP_TILT =34,
  cv::CAP_PROP_ROLL =35,
  cv::CAP_PROP_IRIS =36,
  cv::CAP_PROP_SETTINGS =37,
  cv::CAP_PROP_BUFFERSIZE =38,
  cv::CAP_PROP_AUTOFOCUS =39,
  cv::CAP_PROP_SAR_NUM =40,
  cv::CAP_PROP_SAR_DEN =41
}
 VideoCapture generic properties identifier. More...
 
enum  cv::VideoWriterProperties {
  cv::VIDEOWRITER_PROP_QUALITY = 1,
  cv::VIDEOWRITER_PROP_FRAMEBYTES = 2,
  cv::VIDEOWRITER_PROP_NSTRIPES = 3
}
 VideoWriter generic properties identifier. More...
 

Detailed Description

Enumeration Type Documentation

§ VideoCaptureAPIs

VideoCapture API backends identifier.

Select preferred API for a capture object. To be used in the VideoCapture::VideoCapture() constructor or VideoCapture::open()

Note
Backends are available only if they have been built with your OpenCV binaries. See Video I/O with OpenCV Overview for more information.
Enumerator
CAP_ANY 
Python: cv.CAP_ANY

Auto detect == 0.

CAP_VFW 
Python: cv.CAP_VFW

Video For Windows (platform native)

CAP_V4L 
Python: cv.CAP_V4L

V4L/V4L2 capturing support via libv4l.

CAP_V4L2 
Python: cv.CAP_V4L2

Same as CAP_V4L.

CAP_FIREWIRE 
Python: cv.CAP_FIREWIRE

IEEE 1394 drivers.

CAP_FIREWARE 
Python: cv.CAP_FIREWARE

Same as CAP_FIREWIRE.

CAP_IEEE1394 
Python: cv.CAP_IEEE1394

Same as CAP_FIREWIRE.

CAP_DC1394 
Python: cv.CAP_DC1394

Same as CAP_FIREWIRE.

CAP_CMU1394 
Python: cv.CAP_CMU1394

Same as CAP_FIREWIRE.

CAP_QT 
Python: cv.CAP_QT

QuickTime.

CAP_UNICAP 
Python: cv.CAP_UNICAP

Unicap drivers.

CAP_DSHOW 
Python: cv.CAP_DSHOW

DirectShow (via videoInput)

CAP_PVAPI 
Python: cv.CAP_PVAPI

PvAPI, Prosilica GigE SDK.

CAP_OPENNI 
Python: cv.CAP_OPENNI

OpenNI (for Kinect)

CAP_OPENNI_ASUS 
Python: cv.CAP_OPENNI_ASUS

OpenNI (for Asus Xtion)

CAP_ANDROID 
Python: cv.CAP_ANDROID

Android - not used.

CAP_XIAPI 
Python: cv.CAP_XIAPI

XIMEA Camera API.

CAP_AVFOUNDATION 
Python: cv.CAP_AVFOUNDATION

AVFoundation framework for iOS (OS X Lion will have the same API)

CAP_GIGANETIX 
Python: cv.CAP_GIGANETIX

Smartek Giganetix GigEVisionSDK.

CAP_MSMF 
Python: cv.CAP_MSMF

Microsoft Media Foundation (via videoInput)

CAP_WINRT 
Python: cv.CAP_WINRT

Microsoft Windows Runtime using Media Foundation.

CAP_INTELPERC 
Python: cv.CAP_INTELPERC

Intel Perceptual Computing SDK.

CAP_OPENNI2 
Python: cv.CAP_OPENNI2

OpenNI2 (for Kinect)

CAP_OPENNI2_ASUS 
Python: cv.CAP_OPENNI2_ASUS

OpenNI2 (for Asus Xtion and Occipital Structure sensors)

CAP_GPHOTO2 
Python: cv.CAP_GPHOTO2

gPhoto2 connection

CAP_GSTREAMER 
Python: cv.CAP_GSTREAMER

GStreamer.

CAP_FFMPEG 
Python: cv.CAP_FFMPEG

Open and record video file or stream using the FFMPEG library.

CAP_IMAGES 
Python: cv.CAP_IMAGES

OpenCV Image Sequence (e.g. img_%02d.jpg)

CAP_ARAVIS 
Python: cv.CAP_ARAVIS

Aravis SDK.

CAP_OPENCV_MJPEG 
Python: cv.CAP_OPENCV_MJPEG

Built-in OpenCV MotionJPEG codec.

CAP_INTEL_MFX 
Python: cv.CAP_INTEL_MFX

Intel MediaSDK.

CAP_XINE 
Python: cv.CAP_XINE

XINE engine (Linux)

§ VideoCaptureModes

Generic camera output modes identifier.

Note
Currently, these are supported through the libv4l backend only.
Enumerator
CAP_MODE_BGR 
Python: cv.CAP_MODE_BGR

BGR24 (default)

CAP_MODE_RGB 
Python: cv.CAP_MODE_RGB

RGB24.

CAP_MODE_GRAY 
Python: cv.CAP_MODE_GRAY

Y8.

CAP_MODE_YUYV 
Python: cv.CAP_MODE_YUYV

YUYV.

§ VideoCaptureProperties

VideoCapture generic properties identifier.

Reading / writing properties involves many layers. Some unexpected result might happens along this chain. Effective behaviour depends from device hardware, driver and API Backend.

See also
Additional flags for video I/O API backends, VideoCapture::get(), VideoCapture::set()
Enumerator
CAP_PROP_POS_MSEC 
Python: cv.CAP_PROP_POS_MSEC

Current position of the video file in milliseconds.

CAP_PROP_POS_FRAMES 
Python: cv.CAP_PROP_POS_FRAMES

0-based index of the frame to be decoded/captured next.

CAP_PROP_POS_AVI_RATIO 
Python: cv.CAP_PROP_POS_AVI_RATIO

Relative position of the video file: 0=start of the film, 1=end of the film.

CAP_PROP_FRAME_WIDTH 
Python: cv.CAP_PROP_FRAME_WIDTH

Width of the frames in the video stream.

CAP_PROP_FRAME_HEIGHT 
Python: cv.CAP_PROP_FRAME_HEIGHT

Height of the frames in the video stream.

CAP_PROP_FPS 
Python: cv.CAP_PROP_FPS

Frame rate.

CAP_PROP_FOURCC 
Python: cv.CAP_PROP_FOURCC

4-character code of codec. see VideoWriter::fourcc .

CAP_PROP_FRAME_COUNT 
Python: cv.CAP_PROP_FRAME_COUNT

Number of frames in the video file.

CAP_PROP_FORMAT 
Python: cv.CAP_PROP_FORMAT

Format of the Mat objects returned by VideoCapture::retrieve().

CAP_PROP_MODE 
Python: cv.CAP_PROP_MODE

Backend-specific value indicating the current capture mode.

CAP_PROP_BRIGHTNESS 
Python: cv.CAP_PROP_BRIGHTNESS

Brightness of the image (only for those cameras that support).

CAP_PROP_CONTRAST 
Python: cv.CAP_PROP_CONTRAST

Contrast of the image (only for cameras).

CAP_PROP_SATURATION 
Python: cv.CAP_PROP_SATURATION

Saturation of the image (only for cameras).

CAP_PROP_HUE 
Python: cv.CAP_PROP_HUE

Hue of the image (only for cameras).

CAP_PROP_GAIN 
Python: cv.CAP_PROP_GAIN

Gain of the image (only for those cameras that support).

CAP_PROP_EXPOSURE 
Python: cv.CAP_PROP_EXPOSURE

Exposure (only for those cameras that support).

CAP_PROP_CONVERT_RGB 
Python: cv.CAP_PROP_CONVERT_RGB

Boolean flags indicating whether images should be converted to RGB.

CAP_PROP_WHITE_BALANCE_BLUE_U 
Python: cv.CAP_PROP_WHITE_BALANCE_BLUE_U

Currently unsupported.

CAP_PROP_RECTIFICATION 
Python: cv.CAP_PROP_RECTIFICATION

Rectification flag for stereo cameras (note: only supported by DC1394 v 2.x backend currently).

CAP_PROP_MONOCHROME 
Python: cv.CAP_PROP_MONOCHROME
CAP_PROP_SHARPNESS 
Python: cv.CAP_PROP_SHARPNESS
CAP_PROP_AUTO_EXPOSURE 
Python: cv.CAP_PROP_AUTO_EXPOSURE

DC1394: exposure control done by camera, user can adjust reference level using this feature.

CAP_PROP_GAMMA 
Python: cv.CAP_PROP_GAMMA
CAP_PROP_TEMPERATURE 
Python: cv.CAP_PROP_TEMPERATURE
CAP_PROP_TRIGGER 
Python: cv.CAP_PROP_TRIGGER
CAP_PROP_TRIGGER_DELAY 
Python: cv.CAP_PROP_TRIGGER_DELAY
CAP_PROP_WHITE_BALANCE_RED_V 
Python: cv.CAP_PROP_WHITE_BALANCE_RED_V
CAP_PROP_ZOOM 
Python: cv.CAP_PROP_ZOOM
CAP_PROP_FOCUS 
Python: cv.CAP_PROP_FOCUS
CAP_PROP_GUID 
Python: cv.CAP_PROP_GUID
CAP_PROP_ISO_SPEED 
Python: cv.CAP_PROP_ISO_SPEED
CAP_PROP_BACKLIGHT 
Python: cv.CAP_PROP_BACKLIGHT
CAP_PROP_PAN 
Python: cv.CAP_PROP_PAN
CAP_PROP_TILT 
Python: cv.CAP_PROP_TILT
CAP_PROP_ROLL 
Python: cv.CAP_PROP_ROLL
CAP_PROP_IRIS 
Python: cv.CAP_PROP_IRIS
CAP_PROP_SETTINGS 
Python: cv.CAP_PROP_SETTINGS

Pop up video/camera filter dialog (note: only supported by DSHOW backend currently. The property value is ignored)

CAP_PROP_BUFFERSIZE 
Python: cv.CAP_PROP_BUFFERSIZE
CAP_PROP_AUTOFOCUS 
Python: cv.CAP_PROP_AUTOFOCUS
CAP_PROP_SAR_NUM 
Python: cv.CAP_PROP_SAR_NUM

Sample aspect ratio: num/den (num)

CAP_PROP_SAR_DEN 
Python: cv.CAP_PROP_SAR_DEN

Sample aspect ratio: num/den (den)

§ VideoWriterProperties

VideoWriter generic properties identifier.

See also
VideoWriter::get(), VideoWriter::set()
Enumerator
VIDEOWRITER_PROP_QUALITY 
Python: cv.VIDEOWRITER_PROP_QUALITY

Current quality (0..100%) of the encoded videostream. Can be adjusted dynamically in some codecs.

VIDEOWRITER_PROP_FRAMEBYTES 
Python: cv.VIDEOWRITER_PROP_FRAMEBYTES

(Read-only): Size of just encoded video frame. Note that the encoding order may be different from representation order.

VIDEOWRITER_PROP_NSTRIPES 
Python: cv.VIDEOWRITER_PROP_NSTRIPES

Number of stripes for parallel encoding. -1 for auto detection.