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  • Silverlight AV

    Video

    • Raw Video
    • YV12 - YCrCb(4:2:0)
    • RGBA - 32 bit Alpha Red, Green, Blue
    • WMV1: Windows Media Video 7
    • WMV2: Windows Media Video 8
    • WMV3: Windows Media Video 9
    •       Supports Simple and Main Profiles.
    •       Supports only progressive (non-interlaced) content.
    • WMVA: Windows Media Video Advanced Profile, non-VC-1
    • WVC1: Windows Media Video Advanced Profile, VC-1
    •       Supports Advanced Profile.
    •       Supports only progressive (non-interlaced) content.
    • H264 (ITU-T H.264 / ISO MPEG-4 AVC)
    •       Supports H.264 and MP43 codecs.
    •       Supports Base, Main, and High Profiles
    •       Supports only progressive (non-interlaced) content.
    •       Supports only 4:2:0 chroma subsampling profiles.

    Audio

    • “1”. This is Linear 8 or 16 bit Pulse Code Modulation. Roughly speaking, this is WAV format.
    • "353" - Microsoft Windows Media Audio v7, v8 and v9.x Standard (WMA Standard)
    • "354" - Microsoft Windows Media Audio v9.x and v10 Professional (WMA Professional)
    • Supports full fidelity decoding of WMA 10 Professional Low Bit Rate (LBR) modes in the 32-96 kbps range.
    • Multichannel (5.1 and 7.1 surround) audio content is automatically mixed down to stereo.
    • 24 bit audio will return silence.
    • Sampling Rates beyond 48000 return an invalid format error code in same-domain and a 4001 in cross-domain scenarios.
    • "85" - ISO MPEG-1 Layer III (MP3)
    • "255" - ISO Advanced Audio Coding (AAC)
    • Supports Low Complexity (AAC-LC) decoding at full fidelity (up to 48 kHz).
    • High Efficiency (HE-AAC) encoded content will decode only at half fidelity (up to 24 kHz).
    • Multichannel (5.1 surround) audio content is not supported.

    Unsupported Formats
    The following formats are not supported:

    • Interlaced video content
    • Windows Media Screen
    • Windows Media Audio Professional
    • Windows Media Voice
    • Combination of Windows Media Video and MP3 (WMV video + MP3 audio)
    • Combination of WMV with AAC-LC

     关于Microsoft的若干Codec
    Microsoft的AV文件后缀大多都是WMV,然后在大多数情况下,WMV文件是被封装在一个ASF 的container format中的。文件扩展名.wmv描述了一个使用WindowsMedia Video codec的文件。ASF container还可以包含数字版权管理。
    WMV除了表示一种文件名后缀外,还表示一类codec,它也是在WMV 家族中公认的一种codec。这类codec的第一个版本是Windows Media Video 7(WMV 7),4个字母的代号为WMV1,在1999年引入,是在Microsoft的MPEG-4 Part 2的实现的基础上作的。之后又出现了Windows Media Video (WMV 8,WMV2),Windows Media Video 9(WMV 9,WMV3)。WMV9后来升级成为WVC1.
    注意: 这里讲的都是codec,更WMP是没有关系的。
    WMV家族中还有一类codec,称为Windows Media Video Screen (WMV Screen),它用于捕捉屏幕内容,转换第三方屏幕抓取软件获取的Video为WMV Screen文件。它的一个应用就是computer step-by-step demonstration videos。
    Windows Media Video Image (WMV Image) is a video slideshow codec。

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  • 原文地址:https://www.cnblogs.com/whyandinside/p/1551554.html
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