因為有這個需求，通過 ffmpeg 獲取視訊第一幀圖片

Google一把，就有了結果。

參考：

1、http://www.codereye.com/2010/05/get-first-and-last-thumb-of-video-using.html

1、VideoInfo.java 獲取視訊資訊。讀者可認真研究此方法。

import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 獲取視訊的資訊
 * FFMPEG homepage http://ffmpeg.org/about.html
 */
 

public class VideoInfo
{
    //視訊路徑
    private String ffmpegApp;
    //視訊時
    private int hours;
    //視訊分
    private int minutes;
    //視訊秒
    private float seconds;
    //視訊width
    private int width;
    //視訊height
    private int heigt;
    

    public VideoInfo() {}
    
    public VideoInfo(String ffmpegApp)
    {
        
 
this.ffmpegApp = ffmpegApp;
    }
    
    public String toString()
    {
        return "time: " + hours + ":" + minutes + ":" + seconds + ", width = " + width + ", height= " + heigt;
    }
    
    public void getInfo(String videoFilename) throws IOException,
            InterruptedException
    {
        String tmpFile 
 
= videoFilename + ".tmp.png";
        ProcessBuilder processBuilder = new ProcessBuilder(ffmpegApp, "-y",
                "-i", videoFilename, "-vframes", "1", "-ss", "0:0:0", "-an",
                "-vcodec", "png", "-f", "rawvideo", "-s", "100*100", tmpFile);

        Process process = processBuilder.start();

        InputStream stderr = process.getErrorStream();
        InputStreamReader isr = new InputStreamReader(stderr);
        BufferedReader br = new BufferedReader(isr);
        String line;
        //列印 sb，獲取更多資訊。 如 bitrate、width、heigt
        StringBuffer sb = new StringBuffer();
        while ((line = br.readLine()) != null)
        {
            sb.append(line);
        }

        new File(tmpFile).delete();
        
        System.out.println("video info:\n" + sb);
        Pattern pattern = Pattern.compile("Duration: (.*?),");
        Matcher matcher = pattern.matcher(sb);
        
        if (matcher.find())
        {
            String time = matcher.group(1);
            calcTime(time);
        }

        pattern = Pattern.compile("w:\\d+ h:\\d+");
        matcher = pattern.matcher(sb);
        
        if (matcher.find())
        {
            String wh = matcher.group();
            //w:100 h:100
            String[] strs = wh.split("\\s+");
            if(strs != null && strs.length == 2)
            {
                width = Integer.parseInt(strs[0].split(":")[1]);
                heigt = Integer.parseInt(strs[1].split(":")[1]);
            }
        }
        
        process.waitFor();
        if(br != null)
            br.close();
        if(isr != null)
            isr.close();
        if(stderr != null)
            stderr.close();
    }

    private void calcTime(String timeStr)
    {
        String[] parts = timeStr.split(":");
        hours = Integer.parseInt(parts[0]);
        minutes = Integer.parseInt(parts[1]);
        seconds = Float.parseFloat(parts[2]);
    }

    public String getFfmpegApp()
    {
        return ffmpegApp;
    }

    public void setFfmpegApp(String ffmpegApp)
    {
        this.ffmpegApp = ffmpegApp;
    }

    public int getHours()
    {
        return hours;
    }

    public void setHours(int hours)
    {
        this.hours = hours;
    }

    public int getMinutes()
    {
        return minutes;
    }

    public void setMinutes(int minutes)
    {
        this.minutes = minutes;
    }

    public float getSeconds()
    {
        return seconds;
    }

    public void setSeconds(float seconds)
    {
        this.seconds = seconds;
    }

    public int getWidth()
    {
        return width;
    }

    public void setWidth(int width)
    {
        this.width = width;
    }

    public int getHeigt()
    {
        return heigt;
    }

    public void setHeigt(int heigt)
    {
        this.heigt = heigt;
    }

    public static void main(String[] args)
    {
        VideoInfo videoInfo = new VideoInfo("D:\\ffmpeg\\bin\\ffmpeg.exe");
        try
        {
            videoInfo.getInfo("f:/reyo/test.mkv");
            System.out.println(videoInfo);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

從此類，可以看出，我把 ffmpeg，解壓在了 D:\\ffmpeg\\bin\\ffmpeg.exe 路徑下，傳入一個視訊地址，就可以得出視訊資訊。

2、VideoThumbTaker.java 獲取視訊指定播放時間的圖片

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.BufferedReader;

/**
 * @author reyo
 * FFMPEG homepage http://ffmpeg.org/about.html
 * By Google Get first and last thumb of a video using Java and FFMpeg
 * From http://www.codereye.com/2010/05/get-first-and-last-thumb-of-video-using.html
 */

public class VideoThumbTaker
{
    protected String ffmpegApp;

    public VideoThumbTaker(String ffmpegApp)
    {
        this.ffmpegApp = ffmpegApp;
    }

    @SuppressWarnings("unused")
    /****
     * 獲取指定時間內的圖片
     * @param videoFilename:視訊路徑
     * @param thumbFilename:圖片儲存路徑
     * @param width:圖片長
     * @param height:圖片寬
     * @param hour:指定時
     * @param min:指定分
     * @param sec:指定秒
     * @throws IOException
     * @throws InterruptedException
     */
    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();
        
        if(br != null)
            br.close();
        if(isr != null)
            isr.close();
        if(stderr != null)
            stderr.close();
    }

    public static void main(String[] args)
    {
        VideoThumbTaker videoThumbTaker = new VideoThumbTaker("D:\\ffmpeg\\bin\\ffmpeg.exe");
        try
        {
            videoThumbTaker.getThumb("f:/reyo/test.mkv", "C:\\thumbTest.png",    800, 600, 0, 0, 9);
            System.out.println("over");
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

3、VideoFirstThumbTaker.java 獲取第一幀圖片

import java.io.IOException;

/***
 * 
 * 得到第一秒（也是第一幀）圖片
 */
public class VideoFirstThumbTaker extends VideoThumbTaker
{
    public VideoFirstThumbTaker(String ffmpegApp)
    {
        super(ffmpegApp);
    }

    public void getThumb(String videoFilename, String thumbFilename, int width,
            int height) throws IOException, InterruptedException
    {
        super.getThumb(videoFilename, thumbFilename, width, height, 0, 0, 1);
    }
}

4、VideoLastThumbTaker.java 獲取最後一幀圖片

/**
 * 得到最後一秒（也是最後一幀）圖片
 */

public class VideoLastThumbTaker extends VideoThumbTaker
{
    public VideoLastThumbTaker(String ffmpegApp)
    {
        super(ffmpegApp);
    }

    public void getThumb(String videoFilename, String thumbFilename, int width,
            int height) throws IOException, InterruptedException
    {
        VideoInfo videoInfo = new VideoInfo(ffmpegApp);
        videoInfo.getInfo(videoFilename);
        super.getThumb(videoFilename, thumbFilename, width, height,
                videoInfo.getHours(), videoInfo.getMinutes(),
                videoInfo.getSeconds() - 0.2f);
    }
}