Scre records webm video files which are supported by many video sharing platforms like YouTube or Vimeo. Chrome does not support recording to mp4 and that's the reason we can not output to this format. We are working to provide full support for mp4 format with a desktop application that will come later this year.

Some extensions claim to record to mp4 but this is either poorly working (slowing down / crashing your computer) or they just replace the webm extension with mp4, but these videos will still only play on devices that support webm. In some other cases they will upload your video to the cloud and convert it, which poses privacy issues and concerns and might not be desirable in case of slow or metered internet connections.
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