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    <p>Most likely the problem is with ffmpeg and the used video codec. Could you share one of these videos? then we can check the codec and see what's wrong. Also we don't know what ffmpeg version you've got on your system. </p> <p>Just side note, why are you mixing the cv and cv2 interfaces? the code would look better by using just the cv2 interface.</p> <p><strong>Edit:</strong> I forgot to mention, I tested the code, so certainly the problem isn't in the code.</p> <p><strong>Edit 2:</strong> It's likely the problem is with ffmpeg not being able to handle your videos. Without testing the videos in question it's hard to say. You can give the cv2 interface a try, <a href="http://opencv.itseez.com/modules/highgui/doc/reading_and_writing_images_and_video.html?h#videocapture-videocapture" rel="nofollow">cv2.VideoCapture</a> is what you should use to grab frames from a video file.</p> <p><strong>Edit 3:</strong> I had a look at the video, it seems the way OpenCV uses ffmpeg has a problem with your video. A quick workaround is to process your videos with ffmpeg before opening by OpenCV. <code>ffmpeg -sameq -i normal.avi p_norma.avi</code> gives you a video, <code>p_norma.avi</code>, that you can process by OpenCV without problem. For <code>normal.avi</code>:</p> <pre><code>Selected video codec: [rawbgr8flip] vfm: raw (RAW BGR8) </code></pre> <p>and for the generated video <code>p_norma.avi</code>:</p> <pre><code>Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4) </code></pre> <p>Hence, the generated video is about 10 times smaller. Would that be a possible solution for you?</p>
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    1. COI'd be interested to know how to make this entirely cv2-based, as the cv2 interface doesn't seem to have methods like `QueryFrame`, `CaptureFromFile`, or all the others that I call with the plain cv interface in the code snippet. Do I just do `cv2.cv._method_` instead? Also, I'll post a video as soon as I can find one.
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    2. COIn looking for a video to send you, I've had a new development. See edit #2 in the main question.
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    3. COI updated the answer, there is a working example [here](http://shambool.com/2012/05/06/retrieve-every-frame-from-a-video-by-python-and-opencv-24/) showing how to use the cv2 interface for processing video files.
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