twitter video classify crashes

[Draic]

I am downloading videos and photos from twitter. Trying to use the classify postprocessors for twitter to split videos from pictures. Tried:
"postprocessors": [
{
"name": "classify",
"mapping": {
"images": ["jpg", "png", "gif"],
"videos": ["mp4"]
}
}
]
Inside my twitter syntax in the config.
Images work fine but once the first video is processed the script will crash:

[twitter][debug] Traceback
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/gallery_dl/job.py", line 52, in run
self.dispatch(msg)
File "/usr/local/lib/python3.7/site-packages/gallery_dl/job.py", line 94, in dispatch
self.handle_url(url, kwds)
File "/usr/local/lib/python3.7/site-packages/gallery_dl/job.py", line 190, in handle_url
pp.prepare(self.pathfmt)
File "/usr/local/lib/python3.7/site-packages/gallery_dl/postprocessor/classify.py", line 36, in prepare
ext = pathfmt.keywords["extension"]
KeyError: 'extension'

[mikf]

This appears to be a harder-to-solve problem than I initially thought.

With 79f6755 it at least doesn't crash anymore, but it still can't move videos into their own directory.

The main issue here is the youtube-dl downloader setting a (new) filename extension for the video and in doing so causing the target path to be rebuild.

[Draic]

tested it out: Indeed no crash any longer. Videos are not moved to the correct directory as you said, but that is a minor issue for me. Thanks!