Tap To Record Like In Vine Using Javacv

I am trying to implement a tap to record feature like in vine. A sample for handling recording (not touch to record) provided in javacv is https://github.com/bytedeco/javacv/blob/m

Solution 1:

The easy (but imprecise) solution would be to estimate the average frame rate, and use t += 1000000/average_fps; recorder.setTimestamp(t); instead of looking at the actual timestamps.

To be more accurate, you can change onPreviewFrame() as follows:

long thisFrameTime = SystemClock.elapsedRealtime();
timestamps[i] = thisFrameTime;
long lastFrameTime = timestamps[imagesIndex < 2 ? startTime : (imagesIndex-2) % images.length)];
if (lastFrameTime > stopPauseTime) {
    timestampsForRecorder[i] = 1000 * (thisFrameTime - Math.max(stopPauseTime, lastFrameTime));
}

You can feed the second array, timestampsForRecorder, directly to the recorder.

Note that it's safer to use SystemClock.elapsedRealtime() everywhere:

This clock is guaranteed to be monotonic, and continues to tick even when the CPU is in power saving modes, so is the recommend basis for general purpose interval timing.