[Plugin WordPress Video post] Problem with conversion

Hello all, i have a problem with audio codec with this plugin, but if i use a command from command line all works well

Fri, 17 Jul 2015 13:01:54 +0000 -> Video conversion command: /usr/local/bin/ffmpeg -i /home/youbc/public_html/wp-content/uploads/2015/07/sample_iTunes.mov   -ar 44100 -b:a 384k -b:v 384k -ac 2 -acodec aac -vcodec libx264 -refs 1 -coder 1 -level 31 -threads 8 -partitions parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 -flags +mv4 -trellis 1 -cmp 256 -me_range 16 -sc_threshold 40 -i_qfactor 0.71 -bf 0 -g 250 /home/youbc/public_html/wp-content/uploads/2015/07/sample_iTunes.mp4 2>&1
Fri, 17 Jul 2015 13:01:54 +0000 -> Video conversion output:
Fri, 17 Jul 2015 13:01:54 +0000 -> FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  built on Jul 10 2015 16:28:37 with gcc 4.4.7 20120313 (Red Hat 4.4.7-11)
  configuration: --enable-libmp3lame --enable-libvorbis --disable-mmx --enable-shared
  libavutil     50.36. 0 / 50.36. 0
  libavcore      0.16. 1 /  0.16. 1
  libavcodec    52.108. 0 / 52.108. 0
  libavformat   52.93. 0 / 52.93. 0
  libavdevice   52. 2. 3 / 52. 2. 3
  libavfilter    1.74. 0 /  1.74. 0
  libswscale     0.12. 0 /  0.12. 0

Seems stream 0 codec frame rate differs from container frame rate: 25.00 (25/1) -> 10.00 (10/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/youbc/public_html/wp-content/uploads/2015/07/sample_iTunes.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2005-10-17 22:54:32
  Duration: 00:01:25.53, start: 0.000000, bitrate: 307 kb/s
    Stream #0.0(eng): Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 261 kb/s, 10 fps, 10 tbr, 3k tbn, 25 tbc
    Metadata:
      creation_time   : 2005-10-17 22:54:33
    Stream #0.1(eng): Audio: aac, 32000 Hz, mono, s16, 43 kb/s
    Metadata:
      creation_time   : 2005-10-17 22:54:34
Unrecognized option 'b:a'

Fri, 17 Jul 2015 13:01:54 +0000 -> FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  built on Jul 10 2015 16:28:37 with gcc 4.4.7 20120313 (Red Hat 4.4.7-11)
  configuration: --enable-libmp3lame --enable-libvorbis --disable-mmx --enable-shared
  libavutil     50.36. 0 / 50.36. 0
  libavcore      0.16. 1 /  0.16. 1
  libavcodec    52.108. 0 / 52.108. 0
  libavformat   52.93. 0 / 52.93. 0
  libavdevice   52. 2. 3 / 52. 2. 3
  libavfilter    1.74. 0 /  1.74. 0
  libswscale     0.12. 0 /  0.12. 0

Seems stream 0 codec frame rate differs from container frame rate: 25.00 (25/1) -> 10.00 (10/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/youbc/public_html/wp-content/uploads/2015/07/sample_iTunes.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 537199360
    compatible_brands: qt
    creation_time   : 2005-10-17 22:54:32
  Duration: 00:01:25.53, start: 0.000000, bitrate: 307 kb/s
    Stream #0.0(eng): Video: mpeg4, yuv420p, 640x480 [PAR 1:1 DAR 4:3], 261 kb/s, 10 fps, 10 tbr, 3k tbn, 25 tbc
    Metadata:
      creation_time   : 2005-10-17 22:54:33
    Stream #0.1(eng): Audio: aac, 32000 Hz, mono, s16, 43 kb/s
    Metadata:
      creation_time   : 2005-10-17 22:54:34
Unable to find a suitable output format for 'aac'

Fri, 17 Jul 2015 13:01:54 +0000 ->
Fri, 17 Jul 2015 13:01:54 +0000 -> Video file was not converted. Possible reasons: missing libraries for ffmpeg, permissions on the directory where the file is being written to...
Fri, 17 Jul 2015 13:01:54 +0000 -> Thumbnail was created: /home/youbc/public_html/wp-content/uploads/2015/07/sample_iTunes.jpg

any idea?