let "Input Folder Path" can handle videos

[mario-huang]

When use "Click to Upload", we can upload videos. But when use "Input Folder Path", it just ignores videos, can only handle audios. And it will not recursively process when a folder has multiple levels of subdirectories.

Also, It would be best if there were an option to save the output directly in the same folder as the original file, instead of always saving it in a fixed 'outputs' folder.