"Remuxing" is fast and doesn't lose a single bit of quality. It's a new letter with a new envelope, you lose the paper, original handwriting and signature, and in addition you get typos from transcribing. It's as if you're opening an envelope with a letter, then read and copy the letter by hand to a new letter, then put the copied letter into a new envelope. The re-encoding is what it will make lose quality. "Recoding" is slow and you lose quality during the conversion, because the software that does recoding unpacks the encoded video, then encodes it again with the new format. It's doing automatically what you can do manually with File->remux recordings.Ībout the process in general: There is "recoding" and there is "remuxing". This way OBS will automatically remux an mkv to mp4 as soon as you stop the recording. The easiest and best method for mkv videos you're creating with OBS is to activate OBS Settings->Advanced->Recording->Automatically remux to mp4. Interrupt that, and the data is still easily accessible. MKV's headers work differently, and don't need to be "fixed up" after the recording finishes. MP4 video is kinda like WAV audio in that the header can't be finished until the data is finished, so if the recording is interrupted without allowing it to tidy up, the header is bad and you can't access the data very well. The reason to record in MKV has nothing to do with the actual format, but the header structure that surrounds it. And because it's not actually changing anything - just a bit-for-bit copy - it goes pretty fast, limited by the hard drive transfer rate, not the CPU. It's more to satisfy a stupid format checker than anything else, but if that's what it takes to make it work somewhere, then that's what it takes. It's still h.264 video with aac audio, or whatever you've set it for, just in a different bucket with a different file extension.
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