* Reset dts validator when container is reset
* Reuse existing dts_validator when disabling audio stream
* Refactor peek logic at the start of a stream
Add a PeekingIterator to support rewinding an iterator so that the code
for adjusting audio streams and start pts can be inlined in the worker.
* Simplification and readability improvements
* Remove unnecessary verbiage from comments and pydoc
* Address pylint errors
* Remove rewind function and just mux the first packet separately
* More cleanup after removing rewind()
* Skip check to self._buffer on every iteration
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