extract a thumbnail of a given frame from a video

[ledzgio]

Hello,

I have an mp4 video and I have to extract a thumbnail image of a specific frame of the video.

How can I do that?

thanks

[Michal Skála]

Hi, try this:

        public static void main(String[] args)

{

IMediaReader reader = ToolFactory.makeReader("g://mp4.mp4");

reader.addListener(new VideoPictureListener());

reader.open();

while (reader.readPacket() == null)

{}

}

private static class VideoPictureListener extends MediaToolAdapter

{

@Override

public void onVideoPicture(IVideoPictureEvent event)

{

super.onVideoPicture(event);

if (event.getTimeStamp() == 1000)

{

IVideoPicture pict = event.getMediaData();  // get the VideoPicture

                            BufferedImage image = event.getImage();   // get the image

                        }

}

}

Michal

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[ledzgio]

Thanks.

If I understand well with event.getTimeStamp() I can seek the video and capture single images, but event.getTimeStamp() is in nanoseconds, how can I convert to frames unit?

[Michal Skála]

You should have a look here: http://www.xuggle.com/public/documentation/java/api/com/xuggle/xuggler/IMediaData.html#getTimeBase()

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[ledzgio]

I don't understand exactly how to manage frames...my video is 25 frame per seconds.

I tried event.getTimeStamp()/1000 which should give me the current frame...I am right?

Il giorno giovedì 5 dicembre 2013 12:40:31 UTC+1, ledzgio ha scritto:

[ledzgio]

There is also another problem, is the video has lot of frames, it will takes lot of time to get the latest frames...is there a way to jump to a frame?

Il giorno giovedì 5 dicembre 2013 12:40:31 UTC+1, ledzgio ha scritto:

[Michal Skála]

Well, it's not possible with the MediaTool API I think, you could try to listen for the onReadPacket event, I guess in this case is the video picture not decoded and it should be a bit faster. But then you'll need to decode the picture by yourself.

Or you can go with the advanced API, some examples here: https://github.com/artclarke/xuggle-xuggler/tree/master/src/com/xuggle/xuggler/demos

Or, you can play with the MP4 file and read movie atoms ;)

Doc here: https://developer.apple.com/library/mac/documentation/QuickTime/QTFF/QTFFChap2/qtff2.html

Michal

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