苹果iOS设备对于视频文件编码的说明:

官网说明
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What are the specifics of the video and audio formats supported?
Although the protocol specification does not limit the video and audio formats, the current Apple implementation supports the following formats:
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Video:
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H.264 Baseline Level 3.0, Baseline Level 3.1, Main Level 3.1, and High Profile Level 4.1.
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Audio:
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HE-AAC or AAC-LC up to 48 kHz, stereo audio
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MP3 (MPEG-1 Audio Layer 3) 8 kHz to 48 kHz, stereo audio
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AC-3 (for Apple TV, in pass-through mode only)
Note: iPad, iPhone 3G, and iPod touch (2nd generation and later) support H.264 Baseline 3.1. If your app runs on older versions of iPhone or iPod touch, however, you should use H.264 Baseline 3.0 for compatibility. If your content is intended solely for iPad, Apple TV, iPhone 4 and later, and Mac OS X computers, you should use Main Level 3.1.
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翻译内容
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不支持的视频和音频格式具体有哪些?
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视频:
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H.264 基线级别 3.0、基线级别 3.1、主级别 3.1 和高级级别 4.1。
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音频:
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HE-AAC 或 AAC-LC 高达 48 kHz,立体声音频
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MP3(MPEG-1 音频第 3 层)8 kHz 至 48 kHz,立体声音频
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AC-3(适用于 Apple TV,仅限直通模式)
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