CODEWITHSUNDEEP
androidandroid-cameraandroid-camera2android-video-record
Hong Duan
Hong Duan

Reputation: 4304

Determine the proper value of MediaRecorder.setVideoEncodingBitRate

I'm implementing video record using MediaRecorder and android.hardware.camera2 APIs, following the googlesamples/android-Camera2Video, it set up MediaRecorder like this (link):

    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    if (mNextVideoAbsolutePath == null || mNextVideoAbsolutePath.isEmpty()) {
        mNextVideoAbsolutePath = getVideoFilePath(getActivity());
    }
    mMediaRecorder.setOutputFile(mNextVideoAbsolutePath);
    mMediaRecorder.setVideoEncodingBitRate(10000000); // <--- look at this line
    mMediaRecorder.setVideoFrameRate(30);
    mMediaRecorder.setVideoSize(mVideoSize.getWidth(), mVideoSize.getHeight());
    mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
    mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
    switch (mSensorOrientation) {
        case SENSOR_ORIENTATION_DEFAULT_DEGREES:
            mMediaRecorder.setOrientationHint(DEFAULT_ORIENTATIONS.get(rotation));
            break;
        case SENSOR_ORIENTATION_INVERSE_DEGREES:
            mMediaRecorder.setOrientationHint(INVERSE_ORIENTATIONS.get(rotation));
            break;
    }
    mMediaRecorder.prepare();

As you can see, it setVideoEncodingBitRate with the fixed value 10000000, but I cannot find any explanation about this value, how can I determine the proper value of MediaRecorder.setVideoEncodingBitRate or should I just use the fixed value 10000000?

Upvotes: 3

Views: 359

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