mkvtomp4 error

[eatatwhiteys]

Hi guys. New here. Been wanting to use mkvtomp4 to change mkv to mp4 obviously, seems like great program but can't get it to work. Log says this. The movie is astroboy not that that matters. All settings default in program. Apologies if this should be posted elsewhere, again new here so please advise.

Repack/encoder video to MP4 for Apple iPhone, iPad, ATV2. MkvToMp4 version 0.223
Build from: Mar 15 2013 15:12:21
Use log file: Temp\Logs\16_09_2013_19_47_12.txt
QuickTime version: 7.6.9
CoreAudioToolbox version: 7.9.6.0
Added on list: F:/Astro Boy (2009)/Astro Boy (2009) 720p.mkv
Started processing file: F:/Astro Boy (2009)/Astro Boy (2009) 720p.mkv
Starting MkvExtract with the parameters:
Tools\mkvextract\mkvextract tracks "F:/Astro Boy (2009)/Astro Boy (2009) 720p.mkv" 0:"Temp\video.264" 1:"Temp\Astro Boy (2009) 720p_internal_audio_2.AAC"
Extracting track 0 with the CodecID 'V_MPEG4/ISO/AVC' to the file 'Temp\video.264'. Container format: AVC/h.264 elementary stream
Extracting track 1 with the CodecID 'A_AAC' to the file 'Temp\Astro Boy (2009) 720p_internal_audio_2.AAC'. Container format: raw AAC file with ADTS headers
Starting Mp4Box with the parameters:
Tools\MP4Box\MP4Box.exe -new -delay 1=1 -add "Temp\video.264":fps=23.976:lang=eng:name="" -add "C:/Program Files/mkvtomp4/Temp/Astro Boy (2009) 720p_internal_audio_2.AAC"#1:fps=23.976:lang=eng:n ame="" -itags tool="MkvToMp4 [www.mkvtomp4.ru] version 0.223" "F:/Astro Boy (2009)\Astro Boy (2009) 720p.mp4" -tmp "Temp/Mp4Box"
[Win32] system failure for file opening of Temp/Mp4Box\00721448_isotmp in mode w+b: 00000003
Cannot open destination file F:/Astro Boy (2009)\Astro Boy (2009) 720p.mp4: I/O Error
Mp4Box terminated with error: 1
Total time: 18 sec.
0 files processed.
1 errors.

[aedipuss]

have you tried running the program as admin? it looks like it doesn't have enough permission from the operating system.