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[extractor/common] imporove HLS video only format detection(closes #18923)
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@ -1596,6 +1596,7 @@ class InfoExtractor(object):
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# References:
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# 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-21
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# 2. https://github.com/rg3/youtube-dl/issues/12211
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# 3. https://github.com/rg3/youtube-dl/issues/18923
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# We should try extracting formats only from master playlists [1, 4.3.4],
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# i.e. playlists that describe available qualities. On the other hand
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@ -1667,11 +1668,16 @@ class InfoExtractor(object):
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rendition = stream_group[0]
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return rendition.get('NAME') or stream_group_id
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# parse EXT-X-MEDIA tags before EXT-X-STREAM-INF inorder to have the
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# chance to detect video only formats when EXT-X-STREAM-INF tags
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# precede EXT-X-MEDIA tags in HLS manifest such as [3].
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for line in m3u8_doc.splitlines():
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if line.startswith('#EXT-X-MEDIA:'):
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extract_media(line)
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for line in m3u8_doc.splitlines():
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if line.startswith('#EXT-X-STREAM-INF:'):
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last_stream_inf = parse_m3u8_attributes(line)
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elif line.startswith('#EXT-X-MEDIA:'):
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extract_media(line)
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elif line.startswith('#') or not line.strip():
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continue
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else:
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