我的项目有一个需求，需要录制视频并上传到服务器，但由于移动网络不稳定，所以我最初决定的做法是每30秒：
停止录制器
重置录制器状态
检索录制器写入的文件，并在不同的线程中上传（多部分表单数据）。
根据当前时间戳的哈希值将录制器的输出文件更改为新文件。
每30秒重复该过程
这样做非常适合我的需求，因为每个30秒的视频文件大小都不超过1MB，并且上传顺利。
但我面临的问题是，每次媒体录制器停止并重新启动时，会有大约500毫秒的延迟，所以我在服务器上接收到的视频每30秒会有这些500毫秒的间隙，这对我目前的情况非常糟糕。因此，我在考虑是否可能在运行过程中修改录制器正在写入的文件？
相关代码：
GenericCallback onTickListener = new GenericCallback() {
@Override
public void execute(Object data) {
int timeElapsedInSecs = (int) data;
if (timeElapsedInSecs % pingIntervalInSecs == 0) {
new API(getActivity().getApplicationContext()).pingServer(objInterviewQuestion.getCurrentAccessToken(),
new NetworkCallback() {
@Override
public void execute(int response_code, Object result) {
// TODO: HANDLE callback
}
});
}
if (timeElapsedInSecs % uploadIntervalInSecs == 0 && timeElapsedInSecs < maxTimeInSeconds) {
if (timeElapsedInSecs / uploadIntervalInSecs >= 1) {
if(stopAndResetRecorder()) {
openConnectionToUploadQueue();
uploadQueue.add(
new InterviewAnswer(0,
objInterviewQuestion.getQid(),
objInterviewQuestion.getAvf(),
objInterviewQuestion.getNext(),
objInterviewQuestion.getCurrentAccessToken()));
objInterviewQuestion.setAvf(MiscHelpers.getOutputMediaFilePath());
initializeAndStartRecording();
}
}
}
}
};
这里是 initializeAndStartRecording()：
private boolean initializeAndStartRecording() {
Log.i("INFO", "initializeAndStartRecording");
if (mCamera != null) {
try {
mMediaRecorder = CameraHelpers.initializeRecorder(mCamera,
mCameraPreview,
desiredVideoWidth,
desiredVideoHeight);
mMediaRecorder.setOutputFile(objInterviewQuestion.getAvf());
mMediaRecorder.prepare();
mMediaRecorder.start();
img_recording.setVisibility(View.VISIBLE);
is_recording = true;
return true;
} catch (Exception ex) {
MiscHelpers.showMsg(getActivity(),
getString(R.string.err_cannot_start_recorder),
AppMsg.STYLE_ALERT);
return false;
}
} else {
MiscHelpers.showMsg(getActivity(), getString(R.string.err_camera_not_available),
AppMsg.STYLE_ALERT);
return false;
}
}
这里是stopAndResetRecorder函数：
boolean stopAndResetRecorder() {
boolean success = false;
try {
if (mMediaRecorder != null) {
try {
//stop recording
mMediaRecorder.stop();
mMediaRecorder.reset();
mMediaRecorder.release();
mMediaRecorder = null;
Log.d("MediaRecorder", "Recorder Stopped");
success = true;
} catch (Exception ex) {
if(ex != null && ex.getMessage()!=null && ex.getMessage().isEmpty()){
Crashlytics.log(Log.ERROR, "Failed to stop MediaRecorder", ex.getMessage());
Crashlytics.logException(ex);
}
success = false;
} finally {
mMediaRecorder = null;
is_recording = false;
is_recording = false;
}
}
} catch (Exception ex) {
success = false;
}
Log.d("MediaRecorder", "Success = " + String.valueOf(success));
return success;
}