FFmpeg是一套可以用来记录、转换数字音频、视频,并能将其转化为流的开源计算机程序。采用LGPL或GPL许可证。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库libavcodec,为了保证高可移植性和编解码质量,libavcodec里很多codec都是从头开发的。
由此看来FFmpeg很强大,很多主流的音频、视频处理软件都使用了FFmpeg。
FFmpeg下载下来解压,cmd进入到FFmpeg.exe目录中,即可在命令行下进行各种操作,查看视频信息命令:ffmpeg 视频 -i,如下图:
D:\ffmpeg\Libs>ffmpeg -i D:\MonitorRecord\monitor_20091222_050948_1.avi
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中执行此操作,解析返回结果,可以得到视频时长等信息。
/**
* 获取视频总时间
* @param viedo_path 视频路径
* @param ffmpeg_path ffmpeg路径
* @return
*/
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();
//从输入流中读取视频信息
BufferedReader br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
br.close();
//从视频信息中解析时长
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+",视频时长:"+time+", 开始时间:"+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;
}