mp4parser库

功能介绍

https://github.com/sannies/mp4parser

Java MP4 Parser是一个读取和写入MP4容器的java api。直接操作容器而不是对音视频进行编解码。

功能：

MP4parser的典型功能如下：
混合音频视频到MP4文件中
合并同样编码设置的MP4文件
增加或者改变MP4文件的metadata
通过省略帧的方式分割MP4文件

例子采用的音频编码格式是H264和AAC，这两种格式对于MP4文件来说非常常见。当然也有AC-3格式的，以及并不常用的H263/MPEG-2视频轨道。

不能把两个编码格式不同的MP4文件进行合并。

项目使用

项目集成

在gradle中添加依赖

compile 'com.googlecode.mp4parser:isoparser:1.1.21'

视频合并

File sdDir;if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {sdDir = Environment.getExternalStorageDirectory();}else{sdDir = Environment.getDataDirectory().getParentFile();}String sdpath = sdDir.getAbsolutePath();//获取指定图片路径String v0 = sdpath + File.separator + "1.mp4";String v1 = sdpath + File.separator + "2.mp4";final ArrayList<String> strings = new ArrayList<>();strings.add(v0);strings.add(v1);final File mergeVideoFile = new File(sdpath + File.separator + "merge.mp4");findViewById(R.id.tv_1).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {String s = Mp4ParserUtils.mergeVideo(strings, mergeVideoFile);Toast.makeText(Mp4PaserActivity.this, "合并成功" + s, Toast.LENGTH_LONG).show();}});

视频分割

        final double [] times = {0,3};  //剪切1~3秒final String srcVideoPath = sdpath + File.separator + "merge.mp4";final String resVideoPath = sdpath + File.separator;findViewById(R.id.tv_2).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {try {Mp4ParserUtils.cutVideo(srcVideoPath, resVideoPath, times);Toast.makeText(Mp4PaserActivity.this, "剪切成功", Toast.LENGTH_LONG).show();} catch (IOException e) {}}});

工具类

package com.dianping.test;import android.content.Context;import com.coremedia.iso.boxes.Container;
import com.googlecode.mp4parser.authoring.Movie;
import com.googlecode.mp4parser.authoring.Track;
import com.googlecode.mp4parser.authoring.builder.DefaultMp4Builder;
import com.googlecode.mp4parser.authoring.container.mp4.MovieCreator;
import com.googlecode.mp4parser.authoring.tracks.AppendTrack;
import com.googlecode.mp4parser.authoring.tracks.CroppedTrack;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;public class Mp4ParserUtils {/*** 合并视频** @param videoList* @param mergeVideoFile* @return*/public static String mergeVideo(ArrayList<String> videoList, File mergeVideoFile) {FileOutputStream fos = null;FileChannel fc = null;try {List<Movie> sourceMovies = new ArrayList<>();for (String video : videoList) {sourceMovies.add(MovieCreator.build(video));}List<Track> videoTracks = new LinkedList<>();List<Track> audioTracks = new LinkedList<>();for (Movie movie : sourceMovies) {for (Track track : movie.getTracks()) {if ("soun".equals(track.getHandler())) {audioTracks.add(track);}if ("vide".equals(track.getHandler())) {videoTracks.add(track);}}}Movie mergeMovie = new Movie();if (audioTracks.size() > 0) {mergeMovie.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()])));}if (videoTracks.size() > 0) {mergeMovie.addTrack(new AppendTrack(videoTracks.toArray(new Track[videoTracks.size()])));}Container out = new DefaultMp4Builder().build(mergeMovie);fos = new FileOutputStream(mergeVideoFile);fc = fos.getChannel();out.writeContainer(fc);fc.close();fos.close();return mergeVideoFile.getAbsolutePath();} catch (Exception e) {e.printStackTrace();} finally {if (fc != null) {try {fc.close();} catch (IOException e) {e.printStackTrace();}}if (fos != null) {try {fos.close();} catch (IOException e) {e.printStackTrace();}}}return null;}/*** 剪切视频* @param srcVideoPath* @param dstVideoPath* @param times* @throws IOException*/public static void cutVideo(String srcVideoPath, String dstVideoPath, double[] times) throws IOException {int dstVideoNumber = times.length / 2;String[] dstVideoPathes = new String[dstVideoNumber];for (int i = 0; i < dstVideoNumber; i++) {dstVideoPathes[i] = dstVideoPath + "cutOutput-" + i + ".mp4";}int timesCount = 0;for (int idst = 0; idst < dstVideoPathes.length; idst++) {//Movie movie = new MovieCreator().build(new RandomAccessFile("/home/sannies/suckerpunch-distantplanet_h1080p/suckerpunch-distantplanet_h1080p.mov", "r").getChannel());Movie movie = MovieCreator.build(srcVideoPath);List<Track> tracks = movie.getTracks();movie.setTracks(new LinkedList<Track>());// remove all tracks we will create new tracks from the olddouble startTime1 = times[timesCount];double endTime1 = times[timesCount + 1];timesCount = timesCount + 2;boolean timeCorrected = false;// Here we try to find a track that has sync samples. Since we can only start decoding// at such a sample we SHOULD make sure that the start of the new fragment is exactly// such a framefor (Track track : tracks) {if (track.getSyncSamples() != null && track.getSyncSamples().length > 0) {if (timeCorrected) {// This exception here could be a false positive in case we have multiple tracks// with sync samples at exactly the same positions. E.g. a single movie containing// multiple qualities of the same video (Microsoft Smooth Streaming file)throw new RuntimeException("The startTime has already been corrected by another track with SyncSample. Not Supported.");}startTime1 = correctTimeToSyncSample(track, startTime1, false);endTime1 = correctTimeToSyncSample(track, endTime1, true);timeCorrected = true;}}for (Track track : tracks) {long currentSample = 0;double currentTime = 0;double lastTime = -1;long startSample1 = -1;long endSample1 = -1;for (int i = 0; i < track.getSampleDurations().length; i++) {long delta = track.getSampleDurations()[i];if (currentTime > lastTime && currentTime <= startTime1) {// current sample is still before the new starttimestartSample1 = currentSample;}if (currentTime > lastTime && currentTime <= endTime1) {// current sample is after the new start time and still before the new endtimeendSample1 = currentSample;}lastTime = currentTime;currentTime += (double) delta / (double) track.getTrackMetaData().getTimescale();currentSample++;}//movie.addTrack(new AppendTrack(new ClippedTrack(track, startSample1, endSample1), new ClippedTrack(track, startSample2, endSample2)));movie.addTrack(new CroppedTrack(track, startSample1, endSample1));}long start1 = System.currentTimeMillis();Container out = new DefaultMp4Builder().build(movie);long start2 = System.currentTimeMillis();FileOutputStream fos = new FileOutputStream(String.format(dstVideoPathes[idst]));FileChannel fc = fos.getChannel();out.writeContainer(fc);fc.close();fos.close();long start3 = System.currentTimeMillis();}}private static double correctTimeToSyncSample(Track track, double cutHere, boolean next) {double[] timeOfSyncSamples = new double[track.getSyncSamples().length];long currentSample = 0;double currentTime = 0;for (int i = 0; i < track.getSampleDurations().length; i++) {long delta = track.getSampleDurations()[i];if (Arrays.binarySearch(track.getSyncSamples(), currentSample + 1) >= 0) {// samples always start with 1 but we start with zero therefore +1timeOfSyncSamples[Arrays.binarySearch(track.getSyncSamples(), currentSample + 1)] = currentTime;}currentTime += (double) delta / (double) track.getTrackMetaData().getTimescale();currentSample++;}double previous = 0;for (double timeOfSyncSample : timeOfSyncSamples) {if (timeOfSyncSample > cutHere) {if (next) {return timeOfSyncSample;} else {return previous;}}previous = timeOfSyncSample;}return timeOfSyncSamples[timeOfSyncSamples.length - 1];}}

局限性

只支持MP4文件
经过尝试对于一些MP4文件分割不了
功能比较少
目前点评有采用这种方案做视频的合并

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