如何在matlab中使用mmreader时自己指定帧速率

Question

我在matlab中有一个视频;我看过使用mmreader。文件信息是：

视频设置：

BitsPerPixel = 24
FrameRate = 25
Height = 288
NumberOfFrames = 590
VideoFormat = RGB24
Width = 352

在我的编码中，我想将帧速率更改为某个值。我怎么能这样做？

Answer 1

您可以使用：

movie(M,n,fps)      

以每秒fps帧的速度播放电影。默认值为每秒12帧。无法达到指定速度的计算机尽可能快地播放

或者，例如，请参阅此代码位（取自matlab文档）。特别是它的最后一行...

%Read and play back the movie file xylophone.mpg:
xyloObj = mmreader('xylophone.mpg');

nFrames = xyloObj.NumberOfFrames;
vidHeight = xyloObj.Height;
vidWidth = xyloObj.Width;

% Preallocate movie structure.
mov(1:nFrames) = ...
struct('cdata', zeros(vidHeight, vidWidth, 3, 'uint8'),...
       'colormap', []);

% Read one frame at a time.
for k = 1 : nFrames
   mov(k).cdata = read(xyloObj, k);
end

% Size a figure based on the video's width and height.
hf = figure;
set(hf, 'position', [150 150 vidWidth vidHeight])

 % Play back the movie once at the video's frame rate.
 movie(hf, mov, 1, xyloObj.FrameRate);