java获取视频播第一帧

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这里用到FFMPEG ，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。

public class VideoThumbTaker {
   protected String ffmpegApp = "D:\\ffmpeg\\bin\\ffmpeg.exe";
   // 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 height;

   public VideoThumbTaker() {

}

@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 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("Video: (.*?), (.*?), (.*?),(.*?),");
       matcher = pattern.matcher(sb);

       if (matcher.find()) {
           String wh = matcher.group(4);
           // w:100 h:100

           String[] strs = wh.split("x");
           if (strs != null && strs.length == 2) {
               width = Integer.parseInt(strs[0].trim());
               if (strs[1].trim().contains("[")) {
                   String hString=strs[1].trim().substring(0,strs[1].trim().indexOf("["));
                   height = Integer.parseInt(hString);
               }else {
                   height = Integer.parseInt(strs[1].trim());
               }
           }
       }

       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 void CutVideoPic(String videoPath, String imgPath) {
       VideoThumbTaker videoThumbTaker = new VideoThumbTaker();
       try {
           videoThumbTaker.getThumb(videoPath, imgPath, 0, 0, 9);
           System.out.println("over");
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
}

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