@@ -600,8 +600,14 @@ static void choose_sample_fmt(AVStream *st, AVCodec *codec)

             if(*p == st->codec->sample_fmt)

                 break;

         }

-        if(*p == -1)

+        if (*p == -1) {

+            av_log(NULL, AV_LOG_WARNING,

+                   "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",

+                   av_get_sample_fmt_name(st->codec->sample_fmt),

+                   codec->name,

+                   av_get_sample_fmt_name(codec->sample_fmts[0]));

             st->codec->sample_fmt = codec->sample_fmts[0];

+        }

     }

 }