* Remove unnecessary pts adjustments
* Add comments
* Use -inf for initial last_dts to be more clear
* Use video first_pts as common adjuster in recorder
* Remove seek(0) before av.open
* Add audio to stream component
* Use container options to do most fmp4 formatting
* Add test for treatment of different audio inputs
* Add test for treatment of different audio inputs
* pcm_mulaw frames should be s16
* Use seek to get BytesIO length
* Remove unused utcnow
* Remove peek_next_audio_pts
* only demux audio and video packets - ignoring data and subtitle streams
Co-authored-by: Jason Hunter <hunterjm@gmail.com>