Video Embed & Thumbnail Generator Wordpress Plugin | Kyle Gilman's Camera Noise Productions: "After you choose a thumbnail it will be registered in the WordPress Media Library and added to the post’s attachments.
I highly recommend starting with H.264 video and AAC audio in an MP4 container. If you’re encoding with Apple’s Compressor, the “Streaming” setting should be “Fast Start” (NOT Fast Start – Compressed Header). I’ve written up my recommended video encode settings in another post."
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