MP4 video recorder.
| CommitFrame | Commit a video frame for encoding. |
| CommitFrame | Commit a video frame for encoding. |
| CommitSamples | Commit an audio sample buffer for encoding. |
| FinishWriting | Finish writing and return the path to the recorded media file. |
| MP4Recorder | Create an MP4 recorder. |
| frameSize | Recording frame size. |