[brightcove:legacy] extract uploader_id as a string

youtube_dl/extractor/brightcove.py

@@ -48,7 +48,7 @@ class BrightcoveLegacyIE(InfoExtractor):
                 'description': 'md5:a950cc4285c43e44d763d036710cd9cd',
                 'timestamp': 1368213670,
                 'upload_date': '20130510',
-                'uploader_id': 1589608506001,
+                'uploader_id': '1589608506001',
             }
         },
         {
@@ -62,7 +62,7 @@ class BrightcoveLegacyIE(InfoExtractor):
                 'uploader': 'Oracle',
                 'timestamp': 1344975024,
                 'upload_date': '20120814',
-                'uploader_id': 1460825906,
+                'uploader_id': '1460825906',
             },
         },
         {
@@ -76,7 +76,7 @@ class BrightcoveLegacyIE(InfoExtractor):
                 'uploader': 'Mashable',
                 'timestamp': 1382041798,
                 'upload_date': '20131017',
-                'uploader_id': 1130468786001,
+                'uploader_id': '1130468786001',
             },
         },
         {
@@ -104,7 +104,7 @@ class BrightcoveLegacyIE(InfoExtractor):
                 'description': 'UCI MTB World Cup 2014: Fort William, UK - Downhill Finals',
                 'timestamp': 1409122195,
                 'upload_date': '20140827',
-                'uploader_id': 710858724001,
+                'uploader_id': '710858724001',
             },
         },
         {
@@ -313,7 +313,7 @@ class BrightcoveLegacyIE(InfoExtractor):
             'description': video_info.get('shortDescription'),
             'thumbnail': video_info.get('videoStillURL') or video_info.get('thumbnailURL'),
             'uploader': video_info.get('publisherName'),
-            'uploader_id': video_info.get('publisherId'),
+            'uploader_id': compat_str(video_info.get('publisherId')),
             'duration': float_or_none(video_info.get('length'), 1000),
             'timestamp': int_or_none(video_info.get('creationDate'), 1000),
         }