在android中进行视频的分割

时间：2016-07-13 22:05:29 阅读：303 评论：0 收藏：0 [点我收藏+]

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最近项目有个需求要对录制的视频进行分割，查了很多资料，看到ffmpeg可以对视频进行分割。上网找到别人基于android的开源ffmpeg，终于编译成功ffmpeg.so。但是要使用的话还要查ffmpeg的api，并且写jni的调用接口，非常麻烦。偶然情况下发现了开源软件mp4parser: http://code.google.com/p/mp4parser/ 一款非常棒的开源软件，可以对视频进行分割、组合等操作，而且使用起来非常简单。通过svn对其下载后可以看到里面带着视频分割的例子，但是是用java实现，将其稍微修改一下就可以用在Android上了。

首先将例子中的代码修改为一个工具类，通过接口传进视频文件的路径和截取视频的开始、结束时间。需要注意的是，如果传的开始时间是10s，视频一般不会刚好是从10s开始的，要根据视频的关键帧做一下调整。截取出来的视频会放到存储卡的Clip目录下。代码如下：

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package com.example.mp4clip;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import android.os.Environment;
import android.util.Log;
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.CroppedTrack;
public class ClipUtil {
private static final String TAG = "ClipUtil";
/**
* 截取指定时间段的视频
* @param path 视频的路径
* @param begin 需要截取的开始时间
* @param end 截取的结束时间
* @throws IOException
*/
public static void clipVideo(String path, double begin, double end)
throws IOException {
File mSdCardDir = Environment.getExternalStorageDirectory();
File f = new File(mSdCardDir.getAbsolutePath() + File.separator
+ Util.SAVE_PATH);
if (!f.exists()) {
f.mkdir();
}
// Movie movie = new MovieCreator().build(new
// RandomAccessFile("/home/sannies/suckerpunch-distantplanet_h1080p/suckerpunch-distantplanet_h1080p.mov",
// "r").getChannel());
Movie movie = MovieCreator.build(path);
List<Track> tracks = movie.getTracks();
movie.setTracks(new LinkedList<Track>());
// remove all tracks we will create new tracks from the old
double startTime1 = begin;
double endTime1 = end;
// double startTime2 = 30;
// double endTime2 = 40;
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 frame
for (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)
Log.e(TAG,
"The startTime has already been corrected by another track with SyncSample. Not Supported.");
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);
// startTime2 = correctTimeToSyncSample(track, startTime2,
// false);
// endTime2 = correctTimeToSyncSample(track, endTime2, true);
timeCorrected = true;
}
}
for (Track track : tracks) {
long currentSample = 0;
double currentTime = 0;
double lastTime = 0;
long startSample1 = -1;
long endSample1 = -1;
// long startSample2 = -1;
// long endSample2 = -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 starttime
startSample1 = currentSample;
}
if (currentTime > lastTime && currentTime <= endTime1) {
// current sample is after the new start time and still
// before the new endtime
endSample1 = currentSample;
}
// if (currentTime > lastTime && currentTime <= startTime2) {
// // current sample is still before the new starttime
// startSample2 = currentSample;
// }
// if (currentTime > lastTime && currentTime <= endTime2) {
// // current sample is after the new start time and still
// before the new endtime
// endSample2 = currentSample;
// }
lastTime = currentTime;
currentTime += (double) delta
/ (double) track.getTrackMetaData().getTimescale();
currentSample++;
}
movie.addTrack(new CroppedTrack(track, startSample1, endSample1));// new
// AppendTrack(new
// CroppedTrack(track,
// startSample1,
// endSample1),
// new
// CroppedTrack(track,
// startSample2,
// endSample2)));
}
long start1 = System.currentTimeMillis();
Container out = new DefaultMp4Builder().build(movie);
long start2 = System.currentTimeMillis();
FileOutputStream fos = new FileOutputStream(f.getAbsolutePath()
+ File.separator
+ String.format("output-%f-%f.mp4", startTime1, endTime1));
FileChannel fc = fos.getChannel();
out.writeContainer(fc);
fc.close();
fos.close();
long start3 = System.currentTimeMillis();
Log.e(TAG, "Building IsoFile took : " + (start2 - start1) + "ms");
Log.e(TAG, "Writing IsoFile took : " + (start3 - start2) + "ms");
Log.e(TAG,
"Writing IsoFile speed : "
+ (new File(String.format("output-%f-%f.mp4",
startTime1, endTime1)).length()
/ (start3 - start2) / 1000) + "MB/s");
}
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
// +1
timeOfSyncSamples[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];
}
}

有了工具类，下面就是增加一个操作界面了。我用一个列表列出所有的视频，点击视频后就会在后台截取出5s~15s总共10s的视频。当然也可以根据需要加上自己想要的开始结束时间，代码如下：

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package com.example.mp4clip;
import java.io.IOException;
import java.lang.ref.SoftReference;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.util.SparseArray;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import edu.mit.mobile.android.imagecache.ImageCache;
import edu.mit.mobile.android.imagecache.ImageCache.OnImageLoadListener;
public class MainActivity extends Activity implements OnItemClickListener,
OnImageLoadListener {
private static final String TAG = "MainActivity";
ListView mList;
private Cursor mCursor;
private final SparseArray<SoftReference<ImageView>> mImageViewsToLoad = new SparseArray<SoftReference<ImageView>>();
private ImageCache mCache;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mCache = ImageCache.getInstance(this);
mCache.registerOnImageLoadListener(this);
mList = (ListView) findViewById(R.id.list);
mList.setOnItemClickListener(this);
mCursor = getContentResolver().query(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI, null, null, null,
MediaStore.Video.Media.DATE_MODIFIED + " desc");
SimpleCursorAdapter adapter = new videoListAdapter(this,
R.layout.video_listitem, mCursor,
new String[] { MediaStore.Video.Media.TITLE },
new int[] { R.id.video_title });
mList.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
// 扫描新多媒体文件,添加到数据库中
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://"
+ Environment.getExternalStorageDirectory()
.getAbsolutePath())));
return false;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
if (mCursor.moveToPosition(position)) {
int index = -1;
index = mCursor.getColumnIndex(MediaStore.Video.Media.DATA);
String path = null;
if (index >= 0) {
path = mCursor.getString(index);
try {
ClipUtil.clipVideo(path, 5, 15);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
private static final class ViewHolder {
/** 视频名称 */
TextView titleView;
/** 视频时长 */
TextView durationView;
/** 文件大小 */
TextView sizeView;
}
private class videoListAdapter extends SimpleCursorAdapter {
/*
* constructor.
*/
public videoListAdapter(Context context, int layout, Cursor c,
String[] from, int[] to) {
super(context, layout, c, from, to);
}
@Override
public int getCount() {
return super.getCount();
}
@Override
public Object getItem(int position) {
return super.getItem(position);
}
@Override
public long getItemId(int position) {
return super.getItemId(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = super.getView(position, convertView, parent);
Cursor cursor = getCursor();
cursor.moveToPosition(position);
ViewHolder holder = (ViewHolder) view.getTag();
if (holder == null) {
holder = new ViewHolder();
holder.titleView = (TextView) view
.findViewById(R.id.video_title);
holder.durationView = (TextView) view
.findViewById(R.id.video_duration);
holder.sizeView = (TextView) view.findViewById(R.id.video_size);
}
view.setTag(holder);
final ImageView iv = (ImageView) view.findViewById(R.id.thumbnail);
int index = -1;
index = mCursor.getColumnIndex(MediaStore.Video.Media.DATA);
String path = null;
if (index >= 0) {
path = mCursor.getString(index);
try {
Drawable draw = mCache.loadImage(position, Uri.parse(path),
120, 120);
if (draw != null) {
iv.setBackground(draw);
} else {
mImageViewsToLoad.put(position,
new SoftReference<ImageView>(iv));
}
} catch (IOException e) {
e.printStackTrace();
}
}
index = -1;
index = cursor.getColumnIndex(MediaStore.Video.Media.TITLE);
String title = null;
if (index >= 0) {
title = cursor.getString(index);
holder.titleView.setText(title);
}
index = -1;
index = cursor.getColumnIndex(MediaStore.Video.Media.DURATION);
int duration;
if (index >= 0) {
duration = cursor.getInt(index);
holder.durationView.setText(Util.durationFormat(duration));
}
index = -1;
index = cursor.getColumnIndex(MediaStore.Video.Media.SIZE);
long size;
if (index >= 0) {
size = cursor.getLong(index);
holder.sizeView.setText(Util.sizeFormat(size));
}
return view;
}
}
@Override
public void onImageLoaded(int id, Uri imageUri, Drawable image) {
Log.d(TAG, "onImageLoaded:" + id);
final SoftReference<ImageView> ivRef = mImageViewsToLoad.get(id);
if (ivRef == null) {
Log.d(TAG, "ivRef=null");
return;
}
final ImageView iv = ivRef.get();
if (iv == null) {
Log.d(TAG, "ivRef=null");
mImageViewsToLoad.remove(id);
return;
}
iv.setBackground(image);
}
}

在android中进行视频的分割

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原文地址：http://www.cnblogs.com/android-blogs/p/5667637.html

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