Oliver Woodman 85e0bca33d Add support for choosing an extractor based on sniffing the container.
- ExtractorSampleSource takes an array of extractors to test for suitability.
- Extractors now implement a sniff() method that returns whether they can
  extract samples in the input stream's format.
- Switch demo app samples to use format detection.

Issue: #438
2015-07-21 17:39:38 +01:00
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