There is no API in Qt Multimedia to do this. As mentioned, QMediaRecorder can only be used with a QCamera.
In a similar fashion to QAudioDecoder, we could have APIs like QAudioEncoder, QVideoDecoder and QVideoEncoder. Though, considering the amount of work there is to improve existing APIs, I don’t think new APIs like these ones will be added any time soon. I’d recommend to use libav (https://libav.org) to do this. — Yoann
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