how to create thumbnail system for MP4 files - file

Question

I know I know, why am I using MP4 still?? It's because I have like 100 files already in this format and I need to upload to a website, I have the mp4 file embeded in the site already and the file played changes according to php.
but what I really need is a way to dynamically create a thumbnail or take a snapshot of the video file to display on the page. I've read a couple things online but they all require the file type to be in FLV, what would be the best way to accomplish this?
Thank you Guys!

Answer 1

have you looked at ffdshow? You can program against it, including capturing thumbnails.

Answer 2

package com.tape.controller;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import javax.imageio.ImageIO;
import org.bytedeco.javacv.FFmpegFrameGrabber;
import org.bytedeco.javacv.OpenCVFrameGrabber;
public class VideoThumbTaker {
protected String ffmpegApp;
public VideoThumbTaker(String ffmpegApp)
{
this.ffmpegApp = ffmpegApp;
}
public void getThumb(String videoFilename, String thumbFilename, int width, int height,int hour, int min, float sec)
throws IOException, InterruptedException
{
ProcessBuilder processBuilder = new ProcessBuilder(ffmpegApp, "-y", "-i", videoFilename, "-vframes", "1",
"-ss", hour + ":" + min + ":" + sec, "-f", "mjpeg", "-s", width + "*" + height, "-an", thumbFilename);
Process process = processBuilder.start();
InputStream stderr = process.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null);
process.waitFor();
}
public static void main(String[] args) throws Exception, IOException
{
FFmpegFrameGrabber g = new FFmpegFrameGrabber("C:\\JavaEE\\New Project\\tape\\src\\main\\webapp\\web-resources\\videos\\vid.mp4");
g.setFormat("mp4");
g.start();
for (int i = 0 ; i < 50 ; i++) {
ImageIO.write(g.grab().getBufferedImage(), "png", new File("C:\\JavaEE\\New Project\\tape\\src\\main\\webapp\\web-resources\\thumbnails\\video-frame-" + System.currentTimeMillis() + ".png"));
}
g.stop();
}
}
I have used this Java code using FFMpegFrameGrabber to create thumnails of a video. Try it out.
Maven Dependency :
<dependency>
<groupId>org.bytedeco</groupId>
<artifactId>javacv</artifactId>
<version>0.8</version>
</dependency>