diff --git a/youtube_dl/extractor/archiveorg.py b/youtube_dl/extractor/archiveorg.py
index 7efd1d8232..61ce4469a0 100644
--- a/youtube_dl/extractor/archiveorg.py
+++ b/youtube_dl/extractor/archiveorg.py
@@ -46,6 +46,8 @@ class ArchiveOrgIE(InfoExtractor):
             for fn,fdata in data['files'].items()
             if 'Video' in fdata['format']]
         formats.sort(key=lambda fdata: fdata['file_size'])
+        for f in formats:
+            f['ext'] = determine_ext(f['url'])
 
         info = {
             '_type': 'video',
@@ -61,7 +63,6 @@ class ArchiveOrgIE(InfoExtractor):
             info['thumbnail'] = thumbnail
 
         # TODO: Remove when #980 has been merged
-        info['url'] = formats[-1]['url']
-        info['ext'] = determine_ext(formats[-1]['url'])
+        info.update(formats[-1])
 
-        return info
\ No newline at end of file
+        return info
diff --git a/youtube_dl/extractor/dreisat.py b/youtube_dl/extractor/dreisat.py
index 64b4658053..765cb1f377 100644
--- a/youtube_dl/extractor/dreisat.py
+++ b/youtube_dl/extractor/dreisat.py
@@ -54,6 +54,7 @@ class DreiSatIE(InfoExtractor):
             'width': int(fe.find('./width').text),
             'height': int(fe.find('./height').text),
             'url': fe.find('./url').text,
+            'ext': determine_ext(fe.find('./url').text),
             'filesize': int(fe.find('./filesize').text),
             'video_bitrate': int(fe.find('./videoBitrate').text),
             '3sat_qualityname': fe.find('./quality').text,
@@ -79,7 +80,6 @@ class DreiSatIE(InfoExtractor):
         }
 
         # TODO: Remove when #980 has been merged
-        info['url'] = formats[-1]['url']
-        info['ext'] = determine_ext(formats[-1]['url'])
+        info.update(formats[-1])
 
-        return info
\ No newline at end of file
+        return info
diff --git a/youtube_dl/extractor/trilulilu.py b/youtube_dl/extractor/trilulilu.py
index f278951baf..0bf028f619 100644
--- a/youtube_dl/extractor/trilulilu.py
+++ b/youtube_dl/extractor/trilulilu.py
@@ -52,6 +52,7 @@ class TriluliluIE(InfoExtractor):
             {
                 'format': fnode.text,
                 'url': video_url_template % fnode.text,
+                'ext': fnode.text.partition('-')[0]
             }
 
             for fnode in format_doc.findall('./formats/format')
@@ -67,7 +68,6 @@ class TriluliluIE(InfoExtractor):
         }
 
         # TODO: Remove when #980 has been merged
-        info['url'] = formats[-1]['url']
-        info['ext'] = formats[-1]['format'].partition('-')[0]
+        info.update(formats[-1])
 
         return info