need to dissociate pcm 16bit and 8bit cases

Originally committed as revision 5210 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mov.c

@@ -1077,7 +1077,8 @@ static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
             case CODEC_ID_PCM_S16BE:
                 if (st->codec->bits_per_sample == 8)
                     st->codec->codec_id = CODEC_ID_PCM_S8;
-                /* fall */
+                st->codec->bit_rate = st->codec->sample_rate * 8;
+                break;
             case CODEC_ID_PCM_U8:
                 if (st->codec->bits_per_sample == 16)
                     st->codec->codec_id = CODEC_ID_PCM_S16BE;