I have a pretty standard model where you can upload videos - so far so good.
The video gets uploaded and is also displayed on the show view. Alle seems to be fine....but:

I cannot get a preview fo to work.

```
ActiveStorage::Blob.last.previewable?
--> false

```

```
ActiveStorage::Blob.video?
--> true

```

FFMPEG is installed on the system and in the gem file

```
which ffmpeg   
--> /usr/local/bin/ffmpeg

gem 'streamio-ffmpeg'

```

And of course if I run preview directly, I get an error

```
ActiveStorage::Blob.last.preview(resize: "200x200>").processed
--> ActiveStorage::UnpreviewableError (ActiveStorage::UnpreviewableError)

```

Previewers is having video included

```
Rails.application.config.active_storage.previewers
--> [ActiveStorage::Previewer::PopplerPDFPreviewer, ActiveStorage::Previewer::MuPDFPreviewer, ActiveStorage::Previewer::VideoPreviewer]

```

I also tried different video formats, but nothing works and I am out of ideas where to look.
Anybody had the same issue?