I’ve changed the category of your topic since it’s a general advice question.
The following topics have discussed the situation with ffmpeg on Android and suggest workarounds. The workarounds don’t look easy or simple.
FFMPEG and missing sequence frames on Android
FFmpeg is not available for Android.😥
How can i Installation Ffmpeg on krita with an android tablet?(please help)
I believe that version 5.2.x (expected ‘soon’) will include ffmpeg integrated in.
I don’t know if the .apk will have it.
I’ll ping the main Android developer, @sh-zam, for advice about that.