private boolean findBoxAvcc() {
		try {
			fis.seek(pos+8);
			while (true) {
				while (fis.read() != 'a');
				fis.read(buffer,0,3);
				if (buffer[0] == 'v' && buffer[1] == 'c' && buffer[2] == 'C') break;
			}
		} catch (IOException e) {
			return false;
		}
		return true;

	}
Parse the sdsd box in an mp4 file
fis: proper mp4 file
pos: stsd box's position in the file
src/net/majorkernelpanic/streaming/mp4/MP4Parser.java