writevideo skipping last frame

2014 8 1
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更新时间：2014 8 1
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I am using writevideo to make a movie while creating the images. I have gotten it to work before however, this time it is skipping the last frame although I haven't changed the code. the code is:
if true
narr_anim(7) = struct('cdata',[],'colormap',[]);
myVideo = VideoWriter('dove_anim.avi');
myVideo.FrameRate = 1;
open(myVideo);
for m = 1 : 7
narr_anim(m) = getframe(gcf)
writeVideo(myVideo, narr_anim);
end
close(myVideo);
end
Am I missing something?

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Ben11
Ben11 2014-8-1

0 个投票

Maybe use
narr_anim(m).cdata
in your loop? Other than that your code looks fine to me

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Leyon
Leyon 2014-8-1
When playing the video in mediaplayer the video goes black before the last frame. All frames are printed to the screen. When I add your suggestion it gives:
if true
If the colormap field is empty in a frame, cdata must contain an RGB image.
end
Do I need probably need a pause in the writing. My loop is actually two loops. I provided the inner loop.
Leyon
Leyon 2014-8-1
It seems the problem is with windows media player. When I play the video in realplayer it shows all frames correctly. I guess mediaplayer isn't holding for the last frame.
Ben11
Ben11 2014-8-1
ok glad it worked! What windows media player does is kind of weird though.
Leyon
Leyon 2014-8-1
Running the latest version. Version 12.0.7601.18150 on Windows 7 Pro
Ben11
Ben11 2014-8-1
what about vlc?
Leyon
Leyon 2014-8-1
vlc doesn't even play the video. It opens the first frame, runs the length of the movie but doesn't show the other images.
Leyon
Leyon 2014-8-1
videowriter captured all the frames and if I stop WMP it shows the last frame. But during playback, WMP goes black before the last frame is rendered.

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