# Revision history [back]

### Why does it takes so long to capture the frames and store them in memory?

So, I'm writting a program that loads a video in memory to determine if it's unstabilized. I realized the program was taking way too long to execute, so I put a timer on my code:

const clock_t begin = std::clock();

int frame_count = 0;
bool should_stop = false;

std::vector <cv::Mat> frames;

while(!should_stop)
{
cv::Mat frame;
cap >> frame;

frames.push_back(frame.clone());

if (frame.empty())
{
should_stop = true;
continue;
}
frame_count++;
}

std::cout << "Time: " << float( std::clock () - begin ) / CLOCKS_PER_SEC << std::endl;


But this prints times around ~0.70s as opposed as what I observe and measure with the time command:

$time ./program ~/Desktop/video.mp4 Time: 0.700728s ./program ~/Desktop/video.mp4 0,56s user 0,19s system 2% cpu 36,409 total  Any ideas on why this is happening?  2 retagged pklab 4284 ●7 ●30 ●60 ### Why does it takes so long to capture the frames and store them in memory? So, I'm writting a program that loads a video in memory to determine if it's unstabilized. I realized the program was taking way too long to execute, so I put a timer on my code: const clock_t begin = std::clock(); int frame_count = 0; bool should_stop = false; std::vector <cv::Mat> frames; while(!should_stop) { cv::Mat frame; cap >> frame; frames.push_back(frame.clone()); if (frame.empty()) { should_stop = true; continue; } frame_count++; } std::cout << "Time: " << float( std::clock () - begin ) / CLOCKS_PER_SEC << std::endl;  But this prints times around ~0.70s as opposed as what I observe and measure with the time command: $ time ./program ~/Desktop/video.mp4
Time: 0.700728s
./program ~/Desktop/video.mp4  0,56s user 0,19s system 2% cpu 36,409 total


Any ideas on why this is happening?