FFMPEG Command and Output

/usr/local/bin/ffmpeg -loop 1 -threads 4 -y -i input_image.png -i input_audio.mp3  -s 1280x720 -t 5 -r 25 -vcodec libx264 -profile:v baseline -b:v 512k -acodec aac -ac 2 -ar 44100 -b:a 128k -strict experimental -f mp4 output.mp4 < /dev/null 2>&1



ffmpeg version N-42605-g5784a46 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 18 2012 18:25:15 with gcc 4.4.5
  configuration: --enable-gpl --enable-version3 --disable-debug --enable-libmp3lame --enable-pthreads --enable-libx264 --enable-postproc --enable-libvorbis --enable-avfilter --enable-libvpx --enable-libvo-aacenc --enable-libtheora --enable-libfaac --enable-nonfree
  libavutil      51. 65.100 / 51. 65.100
  libavcodec     54. 41.100 / 54. 41.100
  libavformat    54. 17.100 / 54. 17.100
  libavdevice    54.  1.100 / 54.  1.100
  libavfilter     3.  2.100 /  3.  2.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[image2 @ 0x3182480] max_analyze_duration 5000000 reached at 5000000
Input #0, image2, from 'input_image.png':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb24, 1280x720, 25 fps, 25 tbr, 25 tbn, 25 tbc
[mp3 @ 0x319a640] max_analyze_duration 5000000 reached at 5015510
Input #1, mp3, from 'input_audio.mp3':
  Duration: 00:01:03.45, start: 0.000000, bitrate: 128 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, mono, s16, 128 kb/s
x264 [error]: baseline profile doesn't support 4:4:4
[libx264 @ 0x2a3f940] Error setting profile baseline.
Output #0, mp4, to 'output.mp4':
    Stream #0:0: Video: h264, yuv444p, 1280x720, q=-1--1, 512 kb/s, 90k tbn, 25 tbc
    Stream #0:1: Audio: none, 44100 Hz, stereo, flt, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (png -> libx264)
  Stream #1:0 -> #0:1 (mp3 -> aac)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height