Yeah, I've hit roadblocks with QMediaRecorder in QML, too. It doesn't give the flexibility I needed for .mp4, especially when trying to control resolution and bitrate. I bypassed it using some C++ integration and GStreamer for more precise handling. It took longer, but I got better results and more consistent output.
After recording, I usually need to convert or compress videos depending on the platform they're going to. I've been using this website: ***URL removed*** to convert M4V to MP4 and other formats when I need fast results without messing with too many settings.
*** Moderator note: Posting links to commercial websites is not permitted in this forum. In addition, many so-called "free file converter" websites are being used for malicious purposes to deliver malware. ***
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