h264文件无法删除

[jiqinwei]

try {
H264TrackImpl h264Track = new H264TrackImpl(new FileDataSourceImpl(Environment.getExternalStorageDirectory() + "/imgBufFrame.h264"));
AACTrackImpl aacTrack = new AACTrackImpl(new FileDataSourceImpl(Environment.getExternalStorageDirectory() + "/test.aac"));
Movie movie = new Movie();
movie.addTrack(h264Track);
movie.addTrack(aacTrack);
Container mp4file = new DefaultMp4Builder().build(movie);
FileChannel fc = new FileOutputStream(new File(Environment.getExternalStorageDirectory() + "/encode.mp4")).getChannel();
mp4file.writeContainer(fc);
fc.close();
} catch (IOException e) {
e.printStackTrace();
}

H264TrackImpl h264Track = new H264TrackImpl(new FileDataSourceImpl(Environment.getExternalStorageDirectory() + "/imgBufFrame.h264"));
执行完这里之后，H264源文件一直被占用，无法被删除，直至程序停止