4.
If the SMIL/HTML5 content URL is available, the Play button will change to a
15-second countdown and the playback will start after the countdown. The
countdown can be canceled by clicking the button.
If it keeps showing Checking... for a long time, please go back to Set
content to check the correctness of the URL.
(Fig. 2.5.3)
(Fig. 2.5.4)
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