libavformat/smush.c:185: error: Uninitialized Value
  The value read from channels was never initialized.

libavformat/smush.c:185:9: 
183.         ast->codec->codec_tag   = 0;
184.         ast->codec->sample_rate = sample_rate;
185.         ast->codec->channels    = channels;
             ^
186. 
187.         avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
