Comment to how to make thumbnails start at 20 seconds
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Hello Joseph!
First of all, you need to be sure that all videos in your site will have a time more than 19 seconds. Then you need to add the additional parameter -ss 20 which means to make thumb from 20 seconds. According this thread https://una.io/page/view-discussion?id=1627 it'd better do via an editing the records in `sys_transcoder_filters` table.