JAVA获取视频播第一帧

FFMPEG 功能很强大，做视频必备的软件。大家可通过 http://ffmpeg.org/ 了解。Windows版本的软件，可通过 http://ffmpeg.zeranoe.com/builds/ 下载。

因为有这个需求，通过 ffmpeg 获取视频第一帧图片

Google一把，就有了结果。

参考：

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

 

1、VideoInfo.java 获取视频信息。读者可认真研究此方法。

import java.io.*;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * 获取视频的信息 * FFMPEG homepage http://ffmpeg.org/about.html */public class VideoInfo{    //视频路径    private String ffmpegApp;    //视频时    private int hours;    //视频分    private int minutes;    //视频秒    private float seconds;    //视频width    private int width;    //视频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;        //打印 sb，获取更多信息。 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();        }    }}

从此类，可以看出，我把 ffmpeg，解压在了 D:\\ffmpeg\\bin\\ffmpeg.exe 路径下，传入一个视频地址，就可以得出视频信息。

2、VideoThumbTaker.java 获取视频指定播放时间的图片

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")    /****     * 获取指定时间内的图片     * @param videoFilename:视频路径     * @param thumbFilename:图片保存路径     * @param width:图片长     * @param height:图片宽     * @param hour:指定时     * @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 获取第一帧图片

import java.io.IOException;/*** *  * 得到第一秒（也是第一帧）图片 */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 获取最后一帧图片

/** * 得到最后一秒（也是最后一帧）图片 */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);    }}