If you're using a professional sound mixing board, the board can typically program a delay into it in milliseconds, so the audio actually arrives to your switcher / streaming hardware at the same time as the video. Devices like the ATEM Mini Pro have the ability to program in a delay for the audio, so is in sync with video. However when using an HDMI camera in a live production situation, if you're mixing video from the camera and audio from another source, the audio will generally be in real time while the video will not, resulting in an audio/video mismatch. When recording video, this is irrelevant. Why you need theseĪll HDMI cameras have a slight delay between realtime and what's actually output over HDMI this is simply inherent in HDMI processing and is unavoidable. These are my own custom audio sync tests, provided for you to freely download at all common frame rates of 23.98, 24, 25, 29.97, 50 and 59.94 fps. Apple has been notified of this problem, and replacement files are on the servers. The new exports are all HEVC, which are (verified!) perfectly in sync. The master files were perfect - the H.264 were all shifted by a frame (and in some cases, more!). It turns out this is, as far as I can tell, a bug in Apple Compressor. This is horrendous and I apologize profusely. UPDATE: In March 2021, it was brought to my attention that the downloaded files were actually OUT OF SYNC.
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