视频输出

    To spare you some disappointment, here are some tips specifically targeted at video preparation.

    For anyone creating motion graphics or simple text overlays, overscan is an important consideration.Although its origins are rooted in historic analog TV systems, unfortunately even in 2017,for various reasons it can still be an issue with modern digital flat screen TVs.

    Note

    Due to various limitations in analog TV equipment, the displayed image could sometimesend up shifted horizontally or vary in size, which could lead to the area beyondthe intended visible picture being shown. This hidden area sometimes contained junk noise,timing signals or closed-caption/subtitle data. To avoid this being visible to the viewer,the standard approach for TV manufacturers was to 'overscan' (zoom in) the displayed pictureby a small amount (between 5-10% edge crop) to ensure that at no time would the hidden areas be visible.

    Although modern digital electronics have eliminated the issue of shifting image position,unfortunately, some TV manufacturers have included overscan on their flat screen TVs.Why? Because for many years it was given that the edge of the visible image would rarely be seen,so broadcasters would sometimes overlay 'hidden' data to the very edge of the image(e.g. some types of closed captions). Also, legacy analog recordings might stillcontain unwanted noise around the edge. To avoid consumer complaints,overscan is quite often enabled by default. For some flat screen TVs, it is not possible to disable it.

    Enabling Safe Areas

    Blender has configurable safe-area markings which can be made visible by selecting the scene camera,then in the camera settings by enabling . Several presets are available.If you are producing work for a television network or indeed any client,they may have their own rules and requirements on safe area dimensions — so consult with them.

    When exporting to many of the common video formats, the rendered RGB(A) images go through a conversion processwhereby they are translated to the YCbCr color model. Y corresponds to a gray-scale representation of the image,Cb and Cr contain data for the blue and red channels respectively.Green is encoded into the Y and Cb, Cr channels with some clever math.

    编码面板

    Reference

    编码面板。

    Here you choose which video container, codec, and compression settings you want to use.With all of these compression choices, there is a trade-off between file size,compatibility across platforms, and playback quality.

    Tip

    当你阅读 这块文档，你可以了解更多关于输出的编码过程。如果你使用 执行Blender，可以看到更多输出。

    • 预设
    • 您可以使用预设功能来为输出类型选择最佳效果。
    • Container
    • Video container or file type. For a list of all available options, seevideo formats.
    • 自动分割输出
    • 编码器
    • 选择压缩和编码方法。所有选项列表参考 。

    Note

    标准

    • Output Quality
    • These are preset Rates.
    • Encoding Speed
    • Presets to change between a fast encode (bigger file size) and more compression (smaller file size).
    • Keyframe Interval
    • The number of pictures per .Set to 0 for "intra_only", which disables inter-frame video.A higher number generally leads to a smaller file but needs a higher-powered device to replay it.
    • Max B-frames

    • Enables the use of .

      • Interval
      • The maximum number of B‑frames between non-B-frames.

    比率

    • 比率
    • Sets the average bit rate (quality),which is the count of binary digits per frame.See also: .
    • Video files can use what is called variable bit rate (VBR).This is used to give some segments of the video less compressing to frames that need more dataand less to frames with less data. This can be controlled by the Minimum and Maximum values.
    • 缓冲区
    • 解码器码流缓冲区 尺寸。

    is the process of combining separate video and audio streams into a single file,similar to packing a video file and .mp3 audio file in a zip-file.

    • 比率
    • 多路复用流式处理中最大的位速率。
    • 包大小
    • 减少数据碎片或复用器开销取决于源。

    Audio

    • 音频编码器
    • Audio format to use. For a list of all available options, see.
    • 比率
    • For each codec, you can control the bit rate (quality) of the sound in the movie.Higher bit rates are bigger files that stream worse but sound better.Use powers of 2 for compatibility.
    • 音量
    • 设置音频的输出音量。

    Tip

    The choice of video format depends on what you are planning to do.

    It's not recommended to render directly to a video format in the first instance.If a problem occurs while rendering, the file might become unplayable and you willhave to re-render all frames from the beginning. If you first render out a setof static images such as the default PNG format or the higher-quality OpenEXR(which can retain HDR pixel data), you can combine them asan Image Stripin the Video Sequence Editor (VSE). This way, you can easily:

    • Restart the rendering from the place (the frame) where any problem occurred.
    • Enjoy the rest of the features of the VSE, such as addingfrom previous renders, audio, video clips, etc.

    Tip

    You shouldn't post-process a lossy-compressed file as the compression artifacts may become visible.Lossy compression should be reserved as a final 'delivery format'.