I'm using ffmpeg.wasm in lambda for various video manipulation stuff. It uses ffmpeg binaries under the hood, and takes the path to the binary at runtime. I supply the ffmpeg binary as a lambda layer and point to the layer path. I'm running into an issue - "Error: ffmpeg.wasm can only run one command at a time". I suspect this may be happening because the ffmpeg binary is being shared across multiple instances, because its a layer. Is that a possibility? If I vendored the binary instead of shipping it as a layer, will it stop it being shared across instances?

I don't think that's how lambda works. The runtime environment has the layers copied into it and only one lambda runs in each environment.

Thanks Ross you were right. For future readers, seems to be a quirk of the library itself rather than the binary. Simply calling load and exit on ffmpeg-core before and after every

run

seems to solve this