diff --git a/ox/file.py b/ox/file.py
index e4fedcd..885a982 100644
--- a/ox/file.py
+++ b/ox/file.py
@@ -278,6 +278,8 @@ def ffprobe(filename):
             if 'rotate' in info.get('metadata', {}) and int(info['metadata']['rotate']) in (-180, -90, 90, 180):
                 v['width'], v['height'] = v['height'], v['width']
             k = 'display_aspect_ratio'
+            if k in v:
+                v[k] = ':'.join(reversed(v[k].split(':')))
             if k not in v and 'width' in v \
                     or (k in v and v[k] == '0:1'):
                 v[k] = '%d:%d' % (v['width'], v['height'])