Question

您好我遇到了很多麻烦，我有2个文件，都是Mp4格式，将它们读入FileInputStreams，然后读入ByteArrayOutputStreams。然后我尝试使用另一个ByteArrayOutputStream [finalOutputStream]和write（）来附加两个字节数组。最后我使用FileOutputStream来编写（finalOutputStream.toByteArray（）），flush，close。当我在手机上查看视频时，会有一个“最终”视频应该有2个组合视频，其大小看起来像两个部分的大小加在一起..但是当我观看视频时，它只是第二部分-_- ......就像第二部分覆盖第一部分，但不知何故大小增加了？...继承了一些代码..

    File fileOne = new File(fileLongName);
    File fileTwo = new File(mediaStorageDir.getPath() + File.separator +"VID_TUTPART_"+ (foo-1) + ".mp4");
    FileInputStream fisOne = new FileInputStream(fileOne);
    FileInputStream fisTwo = new FileInputStream(fileTwo);

    int bufferSize = 1024;
    //FileOne
    byte[] buffer = new byte[bufferSize];
    ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();

    //FileTwo
    byte[] bufferTwo = new byte[bufferSize];
    ByteArrayOutputStream byteBufferTwo = new ByteArrayOutputStream();

    int len = 0;
    //FileOne to bytebuffer
    while ((len = fisOne.read(buffer)) != -1) {
      byteBuffer.write(buffer, 0, len);
    }
    //FileTwo to bytebuffer
    while ((len = fisTwo.read(bufferTwo)) != -1) {
      byteBufferTwo.write(buffer, 0, len);
    }
    byte[] byteArrayOne = byteBuffer.toByteArray();
    byte[] byteArrayTwo = byteBuffer.toByteArray();

    ByteArrayOutputStream finalOutputStream = new ByteArrayOutputStream( );
    finalOutputStream.write( byteArrayOne );
    finalOutputStream.write( byteArrayTwo );

    int counterFileNumber = 0;
    while(new File(mediaStorageDir.getPath() + File.separator +"VID_TO_TUTFIN_"+ counterFileNumber + ".mp4").exists()){
        counterFileNumber++;
    }

    String outputFileNameString = mediaStorageDir.getPath() + File.separator +"VID_TO_TUTFIN_"+ counterFileNumber + ".mp4";
    File outputFile = new File(outputFileNameString);
    FileOutputStream fos = new FileOutputStream(outputFile);
    fos.write(finalOutputStream.toByteArray());
    fos.flush();
    fos.close();

Answer 1

@Benoit在你的帮助下想出了这个......希望它可以帮助其他人

    File fileOne = new File(mediaStorageDir.getPath() + File.separator +"theNameOfMyFirstVideo.mp4");
    File fileTwo = new File(mediaStorageDir.getPath() + File.separator +"theNameOfMySecondVideo.mp4");
    FileInputStream fisOne = new FileInputStream(fileOne);
    FileInputStream fisTwo = new FileInputStream(fileTwo);      

    Movie video = MovieCreator.build(Channels.newChannel(fisOne));
    Movie videoTwo = MovieCreator.build(Channels.newChannel(fisTwo));

    List<Track> videoTracks = video.getTracks();
    Track testOneVideoTrack = videoTracks.get(0);
    video.setTracks(new LinkedList<Track>());

    List<Track> videoTwoTracks = videoTwo.getTracks();
    Track testTwoVideoTrack = videoTwoTracks.get(0);

    video.addTrack(new AppendTrack(testTwoVideoTrack,testOneVideoTrack));

    int counterFileNumber = 0;
    while(new File(mediaStorageDir.getPath() + File.separator +"VID_TO_TUTFIN_"+ counterFileNumber + ".mp4").exists()){
        counterFileNumber++;
    }

    IsoFile out = new DefaultMp4Builder().build(video);
    String outputFileNameString = mediaStorageDir.getPath() + File.separator +"VID_TO_TUTFIN_"+ counterFileNumber + ".mp4";
    FileOutputStream fos = new FileOutputStream(new File(String.format(outputFileNameString)));
    out.getBox(fos.getChannel());
    fos.close();

当我调试时，我查看了List videoTracks并看到了第一个元素[0]有一些关于“vide”的东西，而元素[1]有“soun”所以开始使用它...

Answer 2

如果您只是将视频附加在一起它将无效，您还需要重写标题。

我最近使用mp4parser

做了这个

然后您可以关注sample

MovieCreator mc = new MovieCreator();
Movie video = mc.build(Channels.newChannel(AppendExample.class.getResourceAsStream("/count-video.mp4")));
Movie audio = mc.build(Channels.newChannel(AppendExample.class.getResourceAsStream("/count-english-audio.mp4")));


List<Track> videoTracks = video.getTracks();
video.setTracks(new LinkedList<Track>());

List<Track> audioTracks = audio.getTracks();


for (Track videoTrack : videoTracks) {
   video.addTrack(new AppendTrack(videoTrack, videoTrack));
}
for (Track audioTrack : audioTracks) {
   video.addTrack(new AppendTrack(audioTrack, audioTrack));
}

IsoFile out = new DefaultMp4Builder().build(video);
FileOutputStream fos = new FileOutputStream(new File(String.format("output.mp4")));
out.getBox(fos.getChannel());
fos.close();

Android将2 Mp4字节数组一起添加到输出1 Mp4文件（其中最终视频是第一个视频加第二个视频）

2 个答案: