You call mediaSource.addSourceBuffer(mimeType) to declare what codec format you’ll be feeding the buffer.
json.dumps(item.to_dict(), ensure_ascii=False)
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The background radiation from cosmic rays increases with altitude, from 0.3 mSv per year for sea-level areas to 1.0 mSv per year for higher-altitude cities, so for best results use this on a plane or in outer space