小编use*_*618的帖子

我用以下代码录制mp4.但是在我录音的时候

1-是否可以以阵列数据或其他格式实时获取视频帧？

2-是否可以修改帧？例如,反转颜色并使其看起来是负面的.

public class MainActivity extends Activity implements OnClickListener, SurfaceHolder.Callback {
MediaRecorder recorder;
SurfaceHolder holder;
boolean recording = false;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

    recorder = new MediaRecorder();
    initRecorder();
    setContentView(R.layout.activity_main);

    SurfaceView cameraView = (SurfaceView) findViewById(R.id.surfaceView1);
    holder = cameraView.getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    cameraView.setClickable(true);
    cameraView.setOnClickListener(this);
}

private void initRecorder() {
    recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
    recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);

    CamcorderProfile cpHigh = CamcorderProfile
            .get(CamcorderProfile.QUALITY_HIGH);
    recorder.setProfile(cpHigh);

    recorder.setOutputFile(Environment.getExternalStorageDirectory().getPath() + "/video.mp4");
    recorder.setMaxDuration(50 * 1000); // 50 seconds
    recorder.setMaxFileSize(5 * 1000000); // Approximately 5 megabytes
}

private …

这怎么可能？

echo strlen($in);                      //216 OK
echo strlen(substr( $in, 74, 129 ));   //129 WRONG

2º线应为55而不是129.