Do usleep(10000) when all demuxers returned EAGAIN.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@17784 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

ffmpeg.c

@@ -2086,6 +2086,7 @@ static int av_encode(AVFormatContext **output_files,
             if(no_packet_count){
                 no_packet_count=0;
                 memset(no_packet, 0, sizeof(no_packet));
+                usleep(10000);
                 continue;
             }
             break;