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If I had to guess, their audio encoding firmware may be a bit of a hack to avoid using third party sources, but whatever the reason, it's not pretty. MP3 encoding has none of that grittyness, but sounds pretty swhishy for a 128K 44100 Hz 16 bit stream - it sounds more like 64k. It passes audio, but the AAC encoder has a nasty grittyness to it that is definitely an encoding artifact and not overdrive/clipping (even though it somewhat resembles clipping). And there lies the Achilles heel (for our AV-1081 anyway) - the video encoder works as expected, but the audio encoder has issues.
VMIX REVIEWS 1080P
The one we bought is HDMI, but we're using the built in encoder to send 1080p 30 FPS H.265 back to vMix over the internet. vMix's built in VISCA over IP capability controls it with no issues.
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PTZ is smooth and quiet, keeping in mind that movement doesn't softly accelerate / decelerate so slow speeds are required for on-air PTZ motions. Auto focus works well and is pretty predictable, with options for zones and sensitivity. Low light performance surprised me as being above average. The picture quality is very good for being a lower end model. The goal was something that a non-techie could set up and point in the right general direction at which time the vMix operator could take over. We built up a remote camera rig with an AVIPAS AV-1081 camera.