ios - while showing low quality video preview, taking high quality photo -


i'm using avcapturesessionpreset640x480 when showing video preview. , want take photo avcapturesessionpresetphoto (full quality).when pressed take photo button removing avcapturevideodataoutput , adding avcapturestillimageoutput. 

    [session removeoutput:captureoutputvideo];     [session addoutput:captureoutputphoto];

problem is, taked photo being dark. if take photo after wait 0.4 sec, photo better.

    usleep(400000);

how can without wait?


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