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[common] Fix FourCC fallback when parsing ISM (#372)

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In some DASH manifests, the FourCC attribute is actually present,
but empty.  We thus apply the same fallback to 'AACL' that we do
when the attribute is entirely absent.

Authored by: fstirlitz
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felix 2021-05-02 11:10:35 +02:00 committed by pukkandan
parent 5e1dba8ed6
commit e2efe599aa
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yt_dlp/extractor/common.py
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@ -2876,7 +2876,7 @@ def _parse_ism_formats_and_subtitles(self, ism_doc, ism_url, ism_id=None):
stream_name = stream.get('Name')
stream_language = stream.get('Language', 'und')
for track in stream.findall('QualityLevel'):
fourcc = track.get('FourCC', 'AACL' if track.get('AudioTag') == '255' else None)
fourcc = track.get('FourCC') or ('AACL' if track.get('AudioTag') == '255' else None)
# TODO: add support for WVC1 and WMAP
if fourcc not in ('H264', 'AVC1', 'AACL', 'TTML'):
self.report_warning('%s is not a supported codec' % fourcc)