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As required for live view (#59) to work on Safari. Safari has some "interesting" expectations: * There must be a non-empty list of compatible brands. The major brand is not automatically included. (Looks like ISO/IEC 14496-12 doesn't spell out which is correct.) * The tfdt box must be before the trun boxes. Moonfire NVR was not compliant with ISO/IEC 14496-12:2015 section 8.8.12.1 before. Chrome and Firefox didn't care, but Safari does. * The mdat must be written with the small format. Safari is not implementing the spec properly. I figured these out by painstakingly comparing Moonfire NVR's output with gpac's, making it match almost byte-for-byte until it worked, then backing out changes one at a time to check which were relevant. Ugh!