Re: [mediacapture-record] What is the "important"difference between start/stop and pause/resume methods? (#195)

If the media source is non-line and being played at an `HTMLMediaElement` then `currentTime` can be set to the value of the previous `pause` or `stop`. FWIW several approaches to recording media files to same media container https://github.com/guest271314/MediaFragmentRecorder/branches. 

Concatenating multiple WebM or other container or containerless media into a single file is possible, and the media can be played back in sequence from the discrete recordings as long as a) the length of the various recordings is known; or b) the merged file is parsed to locate the beginning and ends of the merged files, e.g., https://github.com/WebAudio/web-audio-api-v2/issues/61#issue-554979782. Yes, `start()` does metadata. `pause()`, `resume()` does not write new metadata.

Re "valid" and "invalid" that depends on what the criteria is and what you are trying to achieve.

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