[Interest] Camera won't capture photos in quick succession

Lopes Yoann Yoann.Lopes at theqtcompany.com
Thu Dec 11 12:23:47 CET 2014

On 10 Dec 2014, at 21:33, Jason H <jhihn at gmx.com> wrote:
> Per http://qt-project.org/doc/qt-5/qml-qtmultimedia-cameracapture.html
> "It's permissible to call capture() while the camera is active regardless of the ready property value. If camera is not ready to capture image immediately, the capture request is queued with all the related camera settings, and the request will be executed as soon as possible."
> However when I call capture back to back, I get one photo then: W/Qt      (20383): (null):0 ((null)): QCameraImageCapture error: "Camera not ready"
> How can I capture multiple images in the quickest successtion possible? I need to at least capture 1 picture after searchAndLock() then another with the flash on. 

The Android camera API doesn't allow this. A new capture can be made only after the JPEG image is available. 
Google added a whole new camera API in Android 5.0 which supports burst mode. Qt doesn't support it yet, we'd need a new backend for that.

What you could do is use QVideoProbe to retrieve a viewfinder frame just before calling capture(). Note that its format will be NV21 and you'll have to do the conversion yourself.


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