Added iOS tagging for 265 video #7740
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My first pull request, so please be kind.
Adding "-tag:v hvc1" to the h265/HEVC video codec preset args for ffmpeg. This is something that other ffmpeg wrappers like Handbrake do by default, and is because playback of HEVC video on Apple devices fails using the default hev1 tag.
See here for the differences between the tags: https://community.bitmovin.com/t/whats-the-difference-between-hvc1-and-hev1-hevc-codec-tags-for-fmp4/101
See requirement 1.10 here: https://developer.apple.com/documentation/http-live-streaming/hls-authoring-specification-for-apple-devices#2969487
This change should have no other effects in terms of compatibility.