You may want to reconsider your pixel format, and whether that's really
required for the video content you are presenting. If "anything" is
fine, just add "-pix_fmt yuv420p" to your ffmpeg output options (or
experiment with other 8-bit formats such as yuv444p).

with yuv420p it works fine !

Alternatively, you might be able to upload a separate preview image. I
can't recall whether Facebook offers that

as far as I know that's not possible in Facebook.


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