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Is it to possible to have parallel access of Pi's camera to take stills, when it is streaming through FFMpEG video streaming ?, if not, then how both ( still and streaming) can be processed at the same time, pl reply.

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Only one process can access the camera module at a given time, so you couldn't have, say, raspivid feeding data to ffmpeg and simultaneously use raspistill to capture images. That said, the underlying firmware does support the concept of a "splitter" component which can be used to accomplish something similar (e.g. by connecting one port of the splitter to a video encoder, and another to an image encoder).

An example of using this from python is given in this recipe.

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This can be possible if you use opencv.. Video grab funtion might help.. you can get furthur details on this link.. http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html#videocapture-grab

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