Improve ffmpeg error reporting in case of input/output stream mismatch,

enabling a dump_format() of the mismatched output stream. 



git-svn-id: file:///var/local/repositories/ffmpeg/trunk@13760 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffmpeg.c

@@ -1630,6 +1630,8 @@ static int av_encode(AVFormatContext **output_files,
                         }
                     }
                     if (!found) {
+                        int i= ost->file_index;
+                        dump_format(output_files[i], i, output_files[i]->filename, 1);
                         fprintf(stderr, "Could not find input stream matching output stream #%d.%d\n",
                                 ost->file_index, ost->index);
                         av_exit(1);