Can I encode only part of a video?

Need to encode only a segment of your source video? We offer up a convenient solution to set a duration for your output file.  

Note that you can use any positive number to reflect the start time (in seconds) and duration (in seconds).

via UI:

Start from (sec): Enter value in seconds
Duration (sec): Enter value in seconds

via API:

<?xml version="1.0"?>
        <!-- Format fields -->
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