Is there any standard watermark method for video in any format in Python?
What about still images?
I suggest checking out pyffmpeg or pymedia , but it's about as good as it gets. Try to find a way to use ffmpeg correctly if you can.
For still images, just use PIL , the Python image library.
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If you are looking for a reliable service (payment), I had a very good experience with Zencoder. The python api module is easy to use and fairly well documented.