Retrieve Speed

[cedricve]

Retrieve Speed

[toddhlynch]

As a follow up. The retrieve function simply is:

/**
*Decodes and returns the grabbed video frame.
*/
void RaspiCam_Cv::retrieve ( cv::Mat& image ) {
//here we go!
    image.create ( _impl->getHeight(),_impl->getWidth(),imgFormat );
    _impl->retrieve ( image.ptr<uchar> ( 0 ));
}

Which creates a blank RGB image of the proper height and width and then _impl->retrieve calls...

        void Private_Impl::retrieve ( unsigned char *data,RASPICAM_FORMAT type ) {
            if ( callback_data._buffData.size==0 ) return;
            if ( type!=RASPICAM_FORMAT_IGNORE ) {
                cerr<<__FILE__<<":"<<__LINE__<<" :Private_Impl::retrieve type is not RASPICAM_FORMAT_IGNORE as it should be"<<endl;
            }
            memcpy ( data,callback_data._buffData.data,getImageTypeSize ( State.captureFtm ) );
        }

Which just copies the camera buffer data to the image Mat. Any ideas why it is taking so long?

[luntik2012]

did you measured execution time of every single step inside the lib? possibly, the bottleneck is in rpi zero gpu encoding speed. i have 28.5 fps on rpi 3b with rgb format