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-rw-r--r--youtube_dl/extractor/common.py15
1 files changed, 13 insertions, 2 deletions
diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 77726ee24..b577c9e6d 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -52,8 +52,19 @@ class InfoExtractor(object):
view_count: How many users have watched the video on the platform.
urlhandle: [internal] The urlHandle to be used to download the file,
like returned by urllib.request.urlopen
-
- The fields should all be Unicode strings.
+ formats: A list of dictionaries for each format available, it must
+ be ordered from worst to best quality. Potential fields:
+ * url Mandatory. The URL of the video file
+ * ext Will be calculated from url if missing
+ * format A human-readable description of the format
+ ("mp4 container with h264/opus").
+ Calculated from width and height if missing.
+ * format_id A short description of the format
+ ("mp4_h264_opus" or "19")
+ * width Width of the video, if known
+ * height Height of the video, if known
+
+ Unless mentioned otherwise, the fields should be Unicode strings.
Subclasses of this one should re-define the _real_initialize() and
_real_extract() methods and define a _VALID_URL regexp.