When using SDX version 1.0 video files in Camera-Viewer EX, you cannot use the 
[Start Time] or 
[Time Slider Control] to define the playback start position.
For the types of video files you can play in Camera-Viewer EX, see the following.
Terminology
The time displayed for the [Start Recording Time] and the [End Recording Time] may vary up to +/- 1 second from the actual recording time.