You've checking if currentTime is smaller than the startOffset, and if so currentTime is set to 0. If currentTime is zero, the remaining time is equal to the duration.
But currentTime already takes into account the startOffset. If currentTime is at 0, it actually is at startOffset in the full video, so you don't need the additional check.
cladera
commented
7 years ago
Description
The remaining time isn't correctly updated when using this plugin. It stays equal to the duration of the video for the entire length.
Steps to reproduce
set remainingTimeDisplay to true and enable the plugin.
Results
Expected
Remaining time should count towards zero while playing
Actual
Remaining time remains equal to duration.
Additional Information
VideoJS version: v6.2.5 Offset plugin version: 2.0.0-beta.0
Cause and Fix
I don't want to go through the hassle to set up development environment etc.. but the problem is caused by the check on line 91 https://github.com/cladera/videojs-offset/blob/master/src/js/index.js#L91
You've checking if currentTime is smaller than the startOffset, and if so currentTime is set to 0. If currentTime is zero, the remaining time is equal to the duration.
But currentTime already takes into account the startOffset. If currentTime is at 0, it actually is at startOffset in the full video, so you don't need the additional check.
So if you remove lines 91 through 93
This will work.