@@ -590,8 +590,15 @@ static void choose_pixel_fmt(AVStream *st, AVCodec *codec)

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

                 break;

         }

-        if(*p == -1)

+        if (*p == -1) {

+            if(st->codec->pix_fmt != PIX_FMT_NONE)

+                av_log(NULL, AV_LOG_WARNING,

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

+                        av_pix_fmt_descriptors[st->codec->pix_fmt].name,

+                        codec->name,

+                        av_pix_fmt_descriptors[codec->pix_fmts[0]].name);

             st->codec->pix_fmt = codec->pix_fmts[0];

+        }

     }

 }