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發表於 2020-10-21 22:38:48
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本文最後由 6hzzz 於 2020-11-14 12:06 AM 編輯
iPhone 12 shoots video in a newer version of Dolby Vision called Profile 8.4 that’s built on a standard called HLG, or hybrid log-gamma. HLG works differently than PQ systems; it was developed by broadcasters like the BBC and NHK to be backwards compatible with SDR displays so they would only have to broadcast one video stream.
All this means that an iPhone 12 HDR video is a 10-bit HLG file with additional Dolby Vision metadata on top, and it will happily play back as SDR on SDR displays, HLG on HLG displays, and Dolby Vision on Dolby Vision displays that support Profile 8.4.
- Video
- ID : 1
- Format : HEVC
- Format/Info : High Efficiency Video Coding
- Format profile : Main 10@L5.1@High
- HDR format : Dolby Vision, Version 1.0, dvhe.08.0A, BL+RPU, HLG compatible
- Codec ID : hvc1
- Codec ID/Info : High Efficiency Video Coding
- Bit rate : 54.3 Mb/s
- Width : 3 840 pixels
- Height : 2 160 pixels
- Display aspect ratio : 16:9
- Rotation : 180°
- Frame rate mode : Constant
- Frame rate : 60.000 FPS
- Color space : YUV
- Chroma subsampling : 4:2:0
- Bit depth : 10 bits
- Bits/(Pixel*Frame) : 0.109
- Stream size : 52.8 MiB (100%)
- Title : Core Media Video
- Color range : Limited
- Color primaries : BT.2020
- Transfer characteristics : HLG
- Matrix coefficients : BT.2020 non-constant
- Codec configuration box : hvcC+dvvC
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