I'm sure this is a stupidly trivial question, but could someone please
tell me how you determine the length of an audio file in seconds
(without actually playing the file)? I just can't seem to find it from
the code & docs.
The first 'stream' returned by a Demuxer's streams property (after it's
"parse" method has been called with some data) contains a field called
'length', but it's always negative, eg (from a .MP3):
Streams:
({'bitrate': 0,
'block_align': 0,
'channels': 0,
'frame_rate': 25,
'frame_rate_base': 1,
'height': 0,
'id': 86016,
'index': 0,
'length': -2077252342,
'sample_rate': 0,
'type': 1,
'width': 0},)
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