libavcodec/metasound.c:307: error: Uninitialized Value
  The value read from isampf was never initialized.

libavcodec/metasound.c:307:5: 
305. 
306.     switch ((avctx->channels << 16) + (isampf << 8) + ibps) {
307.     case (1 << 16) + ( 8 << 8) +  8:
         ^
308.         tctx->mtab = &ff_metasound_mode0808;
309.         break;
