This was discussed at TPAC with [consensus of #139](https://www.w3.org/2019/09/18-webrtc-minutes.html) for [proposal B](https://docs.google.com/presentation/d/1Xprz0ElNTUWRDdX6kyp11cZ4ItTvUFUmzoXsKZdXxuU/edit#slide=id.g62a86e6d8c_3_6). What is needed is a clarification in the spec, and to be allowed to update the mimeType at onstart when the first frame arrives (that is when we know what we are recording, not synchronously when start() is called). -- GitHub Notification of comment by henbos Please view or discuss this issue at https://github.com/w3c/mediacapture-record/issues/139#issuecomment-535471252 using your GitHub accountReceived on Thursday, 26 September 2019 12:01:46 UTC
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