do not override sample rate for amr nor qcelp, should fix some qcelp files at 16000hz

Originally committed as revision 15397 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mov.c

@@ -986,13 +986,11 @@ static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
 #endif
     /* no ifdef since parameters are always those */
     case CODEC_ID_AMR_WB:
-        st->codec->sample_rate= 16000;
         st->codec->channels= 1; /* really needed */
         break;
     case CODEC_ID_QCELP:
     case CODEC_ID_AMR_NB:
         st->codec->frame_size= sc->samples_per_frame;
-        st->codec->sample_rate= 8000;
         st->codec->channels= 1; /* really needed */
         break;
     case CODEC_ID_MP2: