libavformat/smush.c:184: error: Uninitialized Value
  The value read from sample_rate was never initialized.

libavformat/smush.c:184:9: 
182.         ast->codec->codec_id    = AV_CODEC_ID_ADPCM_VIMA;
183.         ast->codec->codec_tag   = 0;
184.         ast->codec->sample_rate = sample_rate;
             ^
185.         ast->codec->channels    = channels;
186. 
