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YoutubeDL: only set the ‘formats’ field of the info_dict if it was already set before
It caused a circular reference error, when trying to dump it to json (for example with the test video for myvideo.de or any other video without formats)
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@ -688,7 +688,12 @@ def _free_formats_key(f):
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ext_ord)
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formats = sorted(formats, key=_free_formats_key)
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info_dict['formats'] = formats
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if formats[0] is not info_dict:
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# only set the 'formats' fields if the original info_dict list them
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# otherwise we end up with a circular reference, the first (and unique)
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# element in the 'formats' field in info_dict is info_dict itself,
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# wich can't be exported to json
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info_dict['formats'] = formats
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if self.params.get('listformats', None):
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self.list_formats(info_dict)
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return
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