You have to wait until the browser knows the duration of the video before you can seek to a particular time. So, I think you want to wait for the 'loadedmetadata' event something like this:
document.getElementById('myvideo').addEventListener('loadedmetadata', function() { this.currentTime = 2179; }, false);

You have to wait until the browser knows the duration of the video before you can seek to a particular time. So, I think you want to wait for the 'loadedmetadata' event something like this:
document.getElementById('vid1').addEventListener('loadedmetadata', function() { this.currentTime = 50; }, false);