ApurvG ApurvG - 1 year ago 85
Javascript Question

converting time in seconds to hh:mm:ss:ff

I am using video player in my reactjs project. I get current time of player in seconds. I want to convert the time into format hh:mm:ss:ff where ff is from frames. I have already converted time into format hh:mm:ss but I don't know how to make it show ff also. Assume that I have a video which plays at 24 frames per second and I am getting time like this 126.2344452 secs.

I am doing seconds to hh:mm:ss like this

secondsToHms =(d) =>{
d = Number(d);
var h = Math.floor(d / 3600);
var m = Math.floor(d % 3600 / 60);
var s = Math.floor(d % 3600 % 60);
return ((h > 0 ? h + ":" + (m < 10 ? "00" : "") : "00:") + "0"+ m + ":" + (s < 10 ? "0" : "") + s); }


How to do it?

Answer Source

If you know the fps, the calculation should be pretty straight forward:

  1. Get the decimal part of the time with second % 1.
  2. Multiply it by fps: 0.0 second is "frame 0", and 0.9999 second is "frame fps-1".
  3. Add 1 to the zero based frame to make it 1 based.

If you want the total frame instead, simply skip step 1.

secondsToHms = ( d, fps = 24 ) => {
   const pad2 = txt => ( '0' + Math.floor( txt ) ).substr( -2 ),
         h = pad2( d / 3600 ),
         m = pad2( d % 3600 / 60 ),
         s = pad2( d % 60 ),
         f = Math.floor( d % 1 * fps ) + 1;
   return `${h}:${m}:${s}:${f}`;
}

I have taken the liberty to refactor your function. I hope it is still recognisably yours.

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