[Feature]: 录制的视频直接保存成MP4

[dusizhong]

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Is your feature request related to a problem?

录制的视频最好能直接同步保存成MP4一份，因为默认的webm格式特殊不太符合普通用户，另外，录制完成后转码MP4的时间也特别长。

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[imAaryash]

The translation is:

It would be best if the recorded video could also be saved directly as an MP4 copy, because the default WebM format is unusual and not very suitable for ordinary users. Also, the time required to convert the recording to MP4 after completion is especially long.