latmenc: Set latmBufferFullness to largest value to indicate it is not used

Signed-off-by: Janne Grunau <janne-libav@jannau.net>

libavformat/latmenc.c

@@ -116,7 +116,7 @@ static int latm_write_frame_header(AVFormatContext *s, PutBitContext *bs)
         }
 
         put_bits(bs, 3, 0); /* frameLengthType */
-        put_bits(bs, 8, 0); /* latmBufferFullness */
+        put_bits(bs, 8, 0xff); /* latmBufferFullness */
 
         put_bits(bs, 1, 0); /* otherDataPresent */
         put_bits(bs, 1, 0); /* crcCheckPresent */