如何从yuv 420视频剪辑中提取帧并使用matlab将它们存储为不同的图像？

问题描述

如何从yuv 420视频中提取帧？假设我想将它们存储为静止图像。如何？

How do I extract the frames from a yuv 420 video? Let's say i want to store them as still images. How?

推荐答案

以下是来自应该做你想做的事情：

Here's a submission from the MathWorks File Exchange that should do what you want:

$文件到图像文件 b $ b

上面提交的函数 loadFileYuv 将加载YUV文件并返回一组电影帧。每个电影帧都是一个包含以下字段的结构：

The function loadFileYuv from the above submission will load a YUV file and return an array of movie frames. Each movie frame is a structure with the following fields:

• cdata ：矩阵 uint8 的值。尺寸是按宽度乘以3。


• colormap ：N-by-3矩阵的双精度。在真彩色系统上它是空的。

• cdata: A matrix of uint8 values. The dimensions are height-by-width-by-3.
• colormap: An N-by-3 matrix of doubles. It is empty on true color systems.

因此，你可以提取 cdata 数组中每个电影帧的字段，并将其保存/用作RGB图像。

You can therefore extract the cdata field from each movie frame in the array and save/use it as an RGB image.

您的代码可能如下所示：

Your code might look something like this:

nFrames = 115;     %# The number of frames
vidHeight = 352;   %# The image height
vidWidth = 240;    %# The image width
mov = loadFileYuv('myVideo.yuv',vidHeight,vidWidth,1:nFrames);  %# Read the file
for k = 1:nFrames  %# Loop over the movie frames
  imwrite(mov(k).cdata,['myImage' int2str(k) '.bmp']);  %# Save each frame to
                                                        %#   a bitmap image file
end

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