libavcodec/mp3_header_decompress_bsf.c:76: error: Uninitialized Value
  The value read from frame_size was never initialized.

libavcodec/mp3_header_decompress_bsf.c:76:9: 
74. 
75.     if(avctx->channels==2){
76.         uint8_t *p= *poutbuf + frame_size - buf_size;
            ^
77.         if(lsf){
78.             FFSWAP(int, p[1], p[2]);
