I was also having the problem of the images being written coming out at 0 bytes. Also, regarding creating the layer, you don't need to package up ffmpeg yourself as you can just deploy a pre-made layer from the AWS SAR.
My solution ended up being quite different from that outlined here but your article did get me started; for others still having issues I have written a tutorial on my own blog which documents how I got it working.
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I was also having the problem of the images being written coming out at 0 bytes. Also, regarding creating the layer, you don't need to package up ffmpeg yourself as you can just deploy a pre-made layer from the AWS SAR.
My solution ended up being quite different from that outlined here but your article did get me started; for others still having issues I have written a tutorial on my own blog which documents how I got it working.