android.MediaMuxer时间裁剪

使用MediaMuxer裁剪视频_安卓muxer 裁剪视频画布-CSDN博客

关键步骤

mediaExtractor.seekTo(beginTime, MediaExtractor.SEEK_TO_PREVIOUS_SYNC);

long presentTimeUs = mediaExtractor.getSampleTime();
if (presentTimeUs > endTime)
	break;

功能代码

VideoView videoView_video;
ImageButton imageButton_startTime, imageButton_endTime;
Button button_clip;
String path_video="";
int startTime, endTime;

imageButton_startTime = (ImageButton)findViewById(R.id.imageButton_startTime);
imageButton_startTime.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        startTime = videoView_video.getCurrentPosition(); //ms
        Toast.makeText(getApplicationContext(), "开始时间：" + startTime, Toast.LENGTH_SHORT).show();
    }
});

imageButton_endTime = (ImageButton)findViewById(R.id.imageButton_endTime);
imageButton_endTime.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        endTime = videoView_video.getCurrentPosition();
        Toast.makeText(getApplicationContext(), "结束时间：" + endTime, Toast.LENGTH_SHORT).show();
    }
});

button_clip = (Button)findViewById(R.id.button_clip);
button_clip.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (path_video.equals("")) {
            Toast.makeText(getApplicationContext(), "错误：没有视频", Toast.LENGTH_SHORT).show();
            return;
        }
        if (startTime >= endTime) {
            Toast.makeText(getApplicationContext(), "错误：开始时间(" + startTime + ") > 结束时间(" + endTime + ")", Toast.LENGTH_SHORT).show();
            return;
        }
        String path_output = Environment.getExternalStorageDirectory().getPath() + File.separator + Environment.DIRECTORY_MOVIES + path_video.substring(path_video.lastIndexOf("/"), path_video.lastIndexOf(".")) + "_clip.mp4";
        clipVideo(path_video, path_output, startTime, endTime);
    }
});

 

void clipVideo(String path_video, String path_output, int startTime, int endTime) {
    MediaExtractor mediaExtractor = new MediaExtractor();
    try {
        mediaExtractor.setDataSource(path_video);
    } catch (Exception e) {
        Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
        Log.e(Thread.currentThread().getStackTrace()[2] + "", e.toString());
    }
    int videoTrack = -1,
    audioTrack = -1;
    if (mediaExtractor.getTrackCount() == 0) {
        Toast.makeText(getApplicationContext(), "错误：trackCount == 0", Toast.LENGTH_SHORT).show();
        return;
    }
    for (int i = 0; i < mediaExtractor.getTrackCount(); i++) {
        if (mediaExtractor.getTrackFormat(i).getString(MediaFormat.KEY_MIME).startsWith("video/")) {
            videoTrack = i;
        } else if (mediaExtractor.getTrackFormat(i).getString(MediaFormat.KEY_MIME).startsWith("audio/")) {
            audioTrack = i;
        }
    }
    Toast.makeText(getApplicationContext(), "videoTrack: " + videoTrack + "\naudioTrack: " + audioTrack, Toast.LENGTH_SHORT).show();
    Log.e(Thread.currentThread().getStackTrace()[2] + "", "videoTrack: " + videoTrack + ", audioTrack: " + audioTrack);
    MediaFormat videoFormat = mediaExtractor.getTrackFormat(videoTrack);
    MediaFormat audioFormat = mediaExtractor.getTrackFormat(audioTrack);

    MediaMuxer mediaMuxer = null;
    try {
        mediaMuxer = new MediaMuxer(path_output, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
    } catch (Exception e) {
        Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
        Log.e(Thread.currentThread().getStackTrace()[2] + "", e.toString());
    }
    int videoTrackIndex = mediaMuxer.addTrack(videoFormat);
    //int rotation = videoFormat.getInteger(MediaFormat.KEY_ROTATION); //视频的rotation
    //mediaMuxer.setOrientationHint(rotation);
    int audioTrackIndex = mediaMuxer.addTrack(audioFormat);
    mediaMuxer.start();

    int bufferSize = 256 * 1024;
    ByteBuffer inputBuffer = ByteBuffer.allocate(bufferSize);

    //视频部分
    mediaExtractor.selectTrack(videoTrack);
    MediaCodec.BufferInfo videoInfo = new MediaCodec.BufferInfo();
    mediaExtractor.seekTo(startTime * 1000L, MediaExtractor.SEEK_TO_PREVIOUS_SYNC);
    while (true) {
        int sampleSize = mediaExtractor.readSampleData(inputBuffer, 0);
        long presentationTimeUs = mediaExtractor.getSampleTime();
        if (sampleSize < 0 || presentationTimeUs > endTime * 1000L) {
            mediaExtractor.unselectTrack(videoTrack);
            break;
        }
        //int trackIndex = mediaExtractor.getSampleTrackIndex();
        int sampleFlag = mediaExtractor.getSampleFlags();

        videoInfo.offset = 0;
        videoInfo.size = sampleSize;
        videoInfo.flags = sampleFlag;
        videoInfo.presentationTimeUs = presentationTimeUs;
        mediaMuxer.writeSampleData(videoTrackIndex, inputBuffer, videoInfo);
        mediaExtractor.advance();
    }

    //音频
    mediaExtractor.selectTrack(audioTrack);
    MediaCodec.BufferInfo audioInfo = new MediaCodec.BufferInfo();
    mediaExtractor.seekTo(startTime * 1000L, MediaExtractor.SEEK_TO_CLOSEST_SYNC);
    while (true) {
        int sampleSize = mediaExtractor.readSampleData(inputBuffer, 0);
        long presentationTimeUs = mediaExtractor.getSampleTime();
        if (sampleSize < 0 || presentationTimeUs > endTime * 1000L) {
            mediaExtractor.unselectTrack(audioTrack);
            break;
        }
        //int trackIndex = mediaExtractor.getSampleTrackIndex();
        int sampleFlag = mediaExtractor.getSampleFlags();
        audioInfo.offset = 0;
        audioInfo.size = sampleSize;
        audioInfo.flags = sampleFlag;
        audioInfo.presentationTimeUs = presentationTimeUs;
        mediaMuxer.writeSampleData(audioTrackIndex, inputBuffer, audioInfo);
        mediaExtractor.advance();
    }

    mediaMuxer.stop();
    mediaMuxer.release();
    mediaExtractor.release();
    MediaScannerConnection.scanFile(getApplicationContext(), new String[]{
        path_output
    }, null, null);
    Toast.makeText(getApplicationContext(), "视频剪辑完成：" + path_output, Toast.LENGTH_SHORT).show();
}

源码：GitLink | 确实开源