java获取视频播第一帧

待我称王封你为后i 2021-12-09 18:55 642阅读 0赞

FFMPEG 功能很强大，做视频必备的软件。大家可通过 [http://ffmpeg.org/][http_ffmpeg.org] 了解。Windows版本的软件，可通过 [http://ffmpeg.zeranoe.com/builds/][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);  
    \}  
\}

[http_ffmpeg.org]: http://ffmpeg.org/
[http_ffmpeg.zeranoe.com_builds]: http://ffmpeg.zeranoe.com/builds/