I've been using my 700D build to record with mlv lite + mlv snd and as far as I can tell the recordings are running smoothly, didn't ran into any issues.
I do get the Audio failed to stop "error", but that's not a real error. Recording is stopped, and audiometers continue to function. Might have something to do with that.
What's the reason why you want to combine h264 proxy with mlvsnd? h264 proxy has the same audio as mlvsnd (when recording at 48khz) so there's no reason to record it using mlvsnd.
I do get the Audio failed to stop "error", but that's not a real error. Recording is stopped, and audiometers continue to function. Might have something to do with that.
What's the reason why you want to combine h264 proxy with mlvsnd? h264 proxy has the same audio as mlvsnd (when recording at 48khz) so there's no reason to record it using mlvsnd.