[downloader/dash] make initialization_url optional
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@ -40,9 +40,10 @@ class DashSegmentsFD(FileDownloader):
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return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url)
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with open(tmpfilename, 'wb') as outf:
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append_url_to_file(
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outf, combine_url(base_url, info_dict['initialization_url']),
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'initialization segment')
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if info_dict.get('initialization_url'):
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append_url_to_file(
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outf, combine_url(base_url, info_dict['initialization_url']),
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'initialization segment')
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for i, segment_url in enumerate(segment_urls):
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segment_len = append_url_to_file(
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outf, combine_url(base_url, segment_url),
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