Hello guys... How to use ffmpeg on mit app inventor?
You would need an extension for this, and some extension it would have to be 
and it looks like you need a rooted device, and support for aar files
The alternative is to run a linux server online that runs ffmpeg, and upload/download your videos to/from it.
If your requirement is just for a single device, it may be possible to run ffmpeg on an android app called termux, which runs a linux distro in a sandbox.
It would be useful, however, to have ffmpeg on board, given the ridiculous size of even very short videos generated by the default camera.
Could you please give the blocks that uses the ffmpeg.aix?
Thanks
My goal makes video editor using ffmpeg such as cut video frames etc. Could you give the blocks about ffmpeg.aix?
Read my post again. If possible to do it, an extension would need to be written to access ffmpeg. This does not yet exist .
GPL v3 
Hhmm cut from 1 videos and combine it to another videos, compress videos.
It should be possible to implement ffmpeg in theory.
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I once made an extension for graphics processing that uses native libraries. I stored them in the extension's assets folder, then copied them to internal memory and ran them from there.
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Hmm, the extension assets are already in the internal storage. You probably mean the external storage.