Send an email when video encoding ends?

I want to send an email to user when ffmpeg开发者_StackOverflow中文版 encoding process ends.

How can I understand that his/her video is ready?

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Take a look at FAM, which can be used for monitoring directory changes. I suspect that you can use fam_monitor_file. It will give you one event when the file is initially created by the encoder, and a second once it's done writing (encoding).