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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
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49432009
编写于
11月 16, 2021
作者:
A
Alexander Alekhin
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Merge pull request #21064 from alalek:doc_videoio_api_preference_3.4
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3e51448e
473f1087
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modules/videoio/doc/videoio_overview.markdown
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modules/videoio/doc/videoio_overview.markdown
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49432009
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@@ -32,27 +32,26 @@ Select the backend at runtime
OpenCV automatically selects and uses first available backend (
`apiPreference=cv::CAP_ANY`
).
As advanced usage you can select the backend to use at runtime. Currently this option is
available only with %VideoCapture.
As advanced usage you can select the backend to use at runtime.
For example to grab from default camera using
Direct Show
as backend
For example to grab from default camera using
Microsoft Media Foundation (MSMF)
as backend
```
cpp
//declare a capture object
cv
::
VideoCapture
cap
(
0
,
cv
::
CAP_
DSHOW
);
cv
::
VideoCapture
cap
(
0
,
cv
::
CAP_
MSMF
);
//or specify the apiPreference with open
cap
.
open
(
0
,
cv
::
CAP_
DSHOW
);
cap
.
open
(
0
,
cv
::
CAP_
MSMF
);
```
If you want to grab from a file using the
Direct Show
as backend:
If you want to grab from a file using the
Microsoft Media Foundation (MSMF)
as backend:
```
cpp
//declare a capture object
cv
::
VideoCapture
cap
(
filename
,
cv
::
CAP_
DSHOW
);
cv
::
VideoCapture
cap
(
filename
,
cv
::
CAP_
MSMF
);
//or specify the apiPreference with open
cap
.
open
(
filename
,
cv
::
CAP_
DSHOW
);
cap
.
open
(
filename
,
cv
::
CAP_
MSMF
);
```
@sa cv::VideoCapture::open() , cv::VideoCapture::VideoCapture()
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