Display the duration of the video

You can display the duration of the currently active content.

Implement a video-duration display using the following sample code:

   The `PTMediaPlayer` property, ` [seekableRange](https://help.adobe.com/en_US/primetime/api/psdk/appledoc/Classes/PTMediaPlayer.html#//api/name/seekableRange)`, contains the current seekable window range:

* For VOD, this range is the entire VOD content range, including ads. 
* For live/linear, this range represents the seekable window.

   For more information about the API, see [TVSDK 3.4 for iOS API Reference](https://help.adobe.com/en_US/primetime/api/psdk/appledoc_v3/index.html)
CMTimeRange seekableRange = self.player.seekableRange;  
if (CMTIMERANGE_IS_VALID(seekableRange)) { 
    double start = CMTimeGetSeconds(seekableRange.start);  
    double duration = CMTimeGetSeconds(seekableRange.duration); 

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