Question

My iPhone app uses FFMPeg for decoding/playing an audio file.

I’m successfully getting the current time in microseconds from the appropriate FFMPeg function, but I’m not being able to convert it to minutes and seconds (MM:SS).

This is my code to display an NSString containing the time; getFFMPEGtime is the time in microseconds:

 self.currentAudioTime = [NSString stringWithFormat: @"%02d:%02d",
                                (int) getFFMPEGtime / (int)1000000,
                                (int) getFFMPEGtime % 1000000];

It seems that the time in minutes is okay, but the seconds are messed up. What’s the proper way to convert microseconds to minutes and seconds?

Answer 1

I’d argue that your time in seconds is probably right and your time in minutes is most likely wrong.

(int) getFFMPEGtime / (int)1000000 is giving you total seconds

To get MM:SS, you need to do the following:

self.currentAudioTime = [NSString stringWithFormat: @"%02d:%02d",
                                (int) getFFMPEGtime / (int)60000000,
                                (int) ((getFFMPEGtime % 60000000)/1000000)];