如何将字节数组转换为视频文件并将其设置在视频视图上答案

【问题标题】：how to convert byte array to video file and set it on video-view如何将字节数组转换为视频文件并将其设置在视频视图上
【发布时间】：2020-04-16 05:55:49
【问题描述】：

我正在尝试使用以下代码编码视频文件。

 byte[] decodedBytes =  Base64.decode(video, Base64.DEFAULT);
 InputStream input = new ByteArrayInputStream(decodedBytes);
 OutputStream output = null;
 try {
     File file = new File (Environment.getExternalStorageDirectory().toString(),"video.mp4");
     output  = new FileOutputStream(file);
         
     byte[] data = new byte[decodedBytes.length];
     int count;
     while ((count = input.read(data)) != -1) {
         output.write(data, 0, count);
     }
     output.close();
  
     Uri video = Uri.parse(file.getAbsolutePath());
     videoView.setVideoURI(video);
     videoView.start();
 } catch (IOException e) {
     Log.e("check123", e.toString());
     e.printStackTrace();
 }

但我在运行时收到此错误消息：

应用程序无法播放此视频。

【问题讨论】：

byte[] data = new byte[decodedBytes.length]; int count; while ((count = input.read(data)) != -1) { output.write(data, 0, count); }。替换为output.write(decodedBytes);。
你能建议我另一种方法来解码编码的base64视频字符串并将其设置在android studio的videoview上吗？
这是我正在使用的编码代码：videoView.buildDrawingCache();位图位图 = videoView.getDrawingCache(); java.io.ByteArrayOutputStream 流=新 java.io.ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.WEBP, 90, 流); byte[] videoByteArray=stream.toByteArray(); video = Base64.encodeToString(videoByteArray, 0);
另一种方式？你试过我的代码吗？为什么不举报？
是的，我试过你的代码。

标签： java android file file-handling

【解决方案1】：

我找到了解决办法。

public class VideoDemo extends Activity {

private MediaController ctlr;


VideoView videoView = null;

Context context = null;
long totalRead = 0;
int bytesToRead = 50 * 1024;

private int mPlayerPosition;
private File mBufferFile;

@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    getWindow().setFormat(PixelFormat.TRANSLUCENT);
    setContentView(R.layout.main);




    videoView = (VideoView) findViewById(R.id.videoview);


    ctlr = new MediaController(this);

    ctlr.setMediaPlayer(videoView);
    videoView.setMediaController(ctlr);
    videoView.requestFocus();

    new GetYoutubeFile().start();


}



private class GetYoutubeFile extends Thread {
    private String mUrl;
    private String mFile;

    public GetYoutubeFile() {

    }

    @Override
    public void run() {
        super.run();
        try {

            File bufferingDir = new File(
                    Environment.getExternalStorageDirectory()
                            + "/YoutubeBuff");
            InputStream stream = getAssets().open("famous.3gp");
            if (stream == null)
                throw new RuntimeException("stream is null");
            File temp = File.createTempFile("test", "mp4");
            System.out.println("hi");
            temp.deleteOnExit();
            String tempPath = temp.getAbsolutePath();

            File bufferFile = File.createTempFile("test", "mp4");

            BufferedOutputStream bufferOS = new BufferedOutputStream(
                    new FileOutputStream(bufferFile));


            InputStream is = getAssets().open("famous.3gp");
            BufferedInputStream bis = new BufferedInputStream(is, 2048);

            byte[] buffer = new byte[16384];
            int numRead;
            boolean started = false;
            while ((numRead = bis.read(buffer)) != -1) {

                bufferOS.write(buffer, 0, numRead);
                bufferOS.flush();
                totalRead += numRead;
                if (totalRead > 120000 && !started) {
                    Log.e("Player", "BufferHIT:StartPlay");
                    setSourceAndStartPlay(bufferFile);
                    started = true;
                }

            }
            mBufferFile = bufferFile;

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public void setSourceAndStartPlay(File bufferFile) {
    try {

        mPlayerPosition=videoView.getCurrentPosition();
        videoView.setVideoPath(bufferFile.getAbsolutePath());

        videoView.start();

    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void onCompletion(MediaPlayer mp) {
    mPlayerPosition = mp.getCurrentPosition();
    try {
        mp.reset();
        videoView.setVideoPath(new File("mnt/sdcard/YoutubeBuff/"
                + mBufferFile).getAbsolutePath());
        mp.seekTo(mPlayerPosition);
        videoView.start();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }

}

在我的 xml 中，我只有视频视图 Sources

【讨论】：