Maybe I have forgotten something form the last time I tried your add on, but in 2.83 alpha ffmpeg doesn't seem to be detected, and concatenate doesn't seem to be enabled, though I can run the exports:
My path to ffmpeg is: C:\Users\user\Downloads\ffmpeg-20190926-87ddf9f-win64-static\bin\ffmpeg.exe
(On windows)
Maybe I have forgotten something form the last time I tried your add on, but in 2.83 alpha ffmpeg doesn't seem to be detected, and concatenate doesn't seem to be enabled, though I can run the exports:
My path to ffmpeg is: C:\Users\user\Downloads\ffmpeg-20190926-87ddf9f-win64-static\bin\ffmpeg.exe (On windows)
BTW. I noticed another way to export from blender, but I haven't tested it yet: https://github.com/tin2tin/Blender_with_ffmpeg