通过 ffmpeg 获取视频第一帧（指定时间）图片
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，没办法，自己觉得比别人强的，就是会搜索，会google ^_^。
Google一把，就有了结果。
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:/sun/Diana_Vickers_-_The_Boy_Who_Murdered_Love.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 Bashan * 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:/sun/Diana_Vickers_-_The_Boy_Who_Murdered_Love.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); } }
参考：
1、http://www.codereye.com/2010/05/get-first-and-last-thumb-of-video-using.html
2、Google真的好方便。如何学google http://www.it-ebooks.com/html/Internet/Google_For_Dummies_53773_140278_3.html
