轉載位址:http://blog.csdn.net/cyh1111/article/details/50232363
FFmpeg是一套可以用來記錄、轉換數字音頻、視訊,并能将其轉化為流的開源計算機程式。采用LGPL或GPL許可證。它提供了錄制、轉換以及流化音視訊的完整解決方案。它包含了非常先進的音頻/視訊編解碼庫libavcodec,為了保證高可移植性和編解碼品質,libavcodec裡很多codec都是從頭開發的。
主要利用的/usr/bin/ffmpeg -i 698.mp4 這個指令
由此看來FFmpeg很強大,很多主流的音頻、視訊處理軟體都使用了FFmpeg。
FFmpeg下載下傳下來解壓,cmd進入到FFmpeg.exe目錄中,即可在指令行下進行各種操作,檢視視訊資訊指令:ffmpeg 視訊 -i,如下圖:
D:\ffmpeg\Libs>ffmpeg -i D:\MonitorRecord\monitor_20091222_050948_1.avi
[sql] view plain copy
- FFmpeg version SVN-r10087, Copyright (c) 2000-2007 Fabrice Bellard, et al.
- configuration: --prefix=f:/svn_build_bins --enable-memalign-hack --enable-shared --disable-static --enable-w32threads --enable-liba52 --enable-avisynth --enable-libamr-nb --enable-libamr-wb --enable-libfaac --enable-libfaad --enable-libgsm --enable-libmp3lame --enable-libogg --enable-libtheora --enable-libvorbis --enable-libx264 --enable-gpl --extra-cflags=-I/usr/local/include --extra-ldflags=-L/usr/local/lib
- libavutil version: 49.5.0
- libavcodec version: 51.40.4
- libavformat version: 51.12.2
- built on Aug 12 2007 11:38:35, gcc: 4.2.1
- Compiled by msn: dev # fastreaming.com, 2007/08/12
- Enjoy it
- Input #0, avi, from 'D:\MonitorRecord\monitor_20091222_050948_1.avi':
- Duration: 00:00:25.0, start: 0.000000, bitrate: 619 kb/s
- Stream #0.0: Video: mpeg4, yuv420p, 1620x1100, 1.14 fps(r)
- Must supply at least one output file
在Java中執行此操作,解析傳回結果,可以得到視訊時長等資訊。
[java] view plain copy
- public static int getVideoTime(String video_path, String ffmpeg_path) {
- List<String> commands = new java.util.ArrayList<String>();
- commands.add(ffmpeg_path);
- commands.add("-i");
- commands.add(video_path);
- try {
- ProcessBuilder builder = new ProcessBuilder();
- builder.command(commands);
- final Process p = builder.start();
- //從輸入流中讀取視訊資訊
- BufferedReader br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
- StringBuffer sb = new StringBuffer();
- String line = "";
- while ((line = br.readLine()) != null) {
- sb.append(line);
- }
- br.close();
- //從視訊資訊中解析時長
- String regexDuration = "Duration: (.*?), start: (.*?), bitrate: (\\d*) kb\\/s";
- Pattern pattern = Pattern.compile(regexDuration);
- Matcher m = pattern.matcher(sb.toString());
- if (m.find()) {
- int time = getTimelen(m.group(1));
- log.info(video_path+",視訊時長:"+time+", 開始時間:"+m.group(2)+",比特率:"+m.group(3)+"kb/s");
- return time;
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- return 0;
- }
- //格式:"00:00:10.68"
- private static int getTimelen(String timelen){
- int min=0;
- String strs[] = timelen.split(":");
- if (strs[0].compareTo("0") > 0) {
- min+=Integer.valueOf(strs[0])*60*60;//秒
- }
- if(strs[1].compareTo("0")>0){
- min+=Integer.valueOf(strs[1])*60;
- }
- if(strs[2].compareTo("0")>0){
- min+=Math.round(Float.valueOf(strs[2]));
- }
- return min;
- }
以下是調用方法,經測試上述請求可以獲得正确時長
public void updateVideoDuration(String liveId,int videoId){
OSSConfig ossConfig = new OSSConfig();
String videolocalPath = config.getConfigValue("videoLocalPath")+liveId+ossConfig.getSuffix();
LOGGER.info("updateVideoDuration ffmpegpath:" + videolocalPath+" ,liveId:"+liveId);
try{
int duration = FfmpegUtil.getVideoTime(videolocalPath, "/user/bin/ffmpeg");
Video video = new Video();
video.setId(videoId);
video.setDuration(duration);
videoService.updateVideoDuration(video);
LOGGER.info("updateVideoDuration success,duration:"+duration);
}catch(Exception e){
e.printStackTrace();
LOGGER.error("updateVideoDuration error:"+e);
}
}
在 Java 中執行此操作,解析傳回結果,可以得到視訊時長等資訊。