Android的追加2的MP4字节数组相加后输出1 MP4文件（其中最后一个视频是第一视频和第二视频） [英] Android Appending 2 Mp4 Byte Arrays Together to Then Output 1 Mp4 File (where final video is first video plus second video)

问题描述

您好我一直有一个很大的麻烦，我有2个文件，无论是MP4格式，读成FileInputStreams，然后进入ByteArrayOutputStreams。然后，我尝试用另一种ByteArrayOutputStream [finalOutputStream]和写（）'荷兰国际集团两个附加的两个字节数组。最后，我用的FileOutputStream写（finalOutputStream.toByteArray（）），刷新，关闭。当我寻找我的手机上的视频，有一个最后的视频，应该有2组合的视频，其大小，看起来像两部分的尺寸加在一起..但是当我看录像，这仅仅是第二部分-_- ......它就像第二部分覆盖第一，但不知何故尺寸的增加？...继承人一些code ..

 文件fil​​eOne =新的文件（fileLongName）;
    文件FileTwo传送=新的文件（mediaStorageDir.getPath（）+文件分割符+VID_TUTPART _+（FOO-1）+.MP4）;
    的FileInputStream fisOne =新的FileInputStream（fileOne）;
    的FileInputStream fisTwo =新的FileInputStream（FileTwo传送）;

    INT缓冲区大小= 1024;
    // FileOne
    byte []的缓冲区=新的字节[BUFFERSIZE]
    ByteArrayOutputStream的ByteBuffer =新ByteArrayOutputStream（）;

    // FileTwo传送
    byte []的bufferTwo =新的字节[BUFFERSIZE]
    ByteArrayOutputStream byteBufferTwo =新ByteArrayOutputStream（）;

    INT的len = 0;
    // FileOne到的ByteBuffer
    而（（LEN = fisOne.read（缓冲液））！=  -  1）{
      byteBuffer.write（缓冲液，0，LEN）;
    }
    // FileTwo传送到的ByteBuffer
    而（（LEN = fisTwo.read（bufferTwo））！=  -  1）{
      byteBufferTwo.write（缓冲液，0，LEN）;
    }
    byte []的byteArrayOne = byteBuffer.toByteArray（）;
    byte []的byteArrayTwo = byteBuffer.toByteArray（）;

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

    INT counterFileNumber = 0;
    而（新文件（mediaStorageDir.getPath（）+文件分割符+VID_TO_TUTFIN _+ counterFileNumber +.MP4）。存在（））{
        counterFileNumber ++;
    }

    字符串outputFileNameString = mediaStorageDir.getPath（）+文件分割符+VID_TO_TUTFIN _+ counterFileNumber +.MP4;
    文件OUTPUTFILE =新的文件（outputFileNameString）;
    FileOutputStream中FOS =新的FileOutputStream（OUTPUTFILE）;
    fos.write（finalOutputStream.toByteArray（））;
    fos.flush（）;
    fos.close（）;
 

解决方案

如果你只是做一个附加的视频一起，将无法正常工作，您还需要重写头。

我最近做这个用 mp4parser

然后就可以按照样品

  MovieCreator MC =新MovieCreator（）;
电影视频= mc.build（Channels.newChannel（AppendExample.class.getResourceAsStream（/计数video.mp4）））;
电影音效= mc.build（Channels.newChannel（AppendExample.class.getResourceAsStream（/计数 - 英语 -  audio.mp4）））;


名单＆LT;轨道＆GT; videoTracks = video.getTracks（）;
video.setTracks（新的LinkedList＆LT;轨道＆GT;（））;

名单＆LT;轨道＆GT; audioTracks = audio.getTracks（）;


对于（轨道videoTrack：videoTracks）{
   video.addTrack（新AppendTrack（videoTrack，videoTrack））;
}
对于（轨道audioTrack：audioTracks）{
   video.addTrack（新AppendTrack（audioTrack，audioTrack））;
}

IsoFile OUT =新DefaultMp4Builder（）建（视频）。
FileOutputStream中FOS =新的FileOutputStream（新文件（的String.Format（output.mp4）））;
out.getBox（fos.getChannel（））;
fos.close（）;
 

Hi I've been having a lot of trouble with this, I have 2 Files, both Mp4 format, read them into FileInputStreams, then into ByteArrayOutputStreams. I then try to append the two byte arrays by using another ByteArrayOutputStream [finalOutputStream] and write()'ing the two. Finally I use FileOutputStream to write(finalOutputStream.toByteArray()), flush, close. When i look for the video on my phone, there is a "Final" video that should have the 2 combined videos, with a size that looks like the two part's sizes added together.. but when i watch the video, it is only the second part -_- ... it is like the second part overwrites the first, but somehow the size increases?... heres some code..

    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();

解决方案

If you simply make a append the video together it won't work, you also need to rewrite the header.

I did this recently by using mp4parser

Then you can follow the 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();

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