Expand validation of Image Edit Batcher source folder to include video formats #1411

Feature Idea

We can use video in the Init Image field, so we need to be able to batch that operation as we can already do with images. Currently, selecting a path that contains only videos results in an error "Input folder does not contain any images", which is true, but inconvenient. I don't know where else to look in order to enable videos (.mov, .mkv, .mp4 etc) in the batcher. You may also think about including audio since it may become useful in the future.

Additionally, mkv files don't get detected in the Init Image uploader, though they do behave properly as mp4 videos after selecting All Files.

Other

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