For ffmpeg: did you try enabling "Config->Internal->Handling->Ignore all input timecodes" ?
I also checked the ffmpeg file again and for me it doesn't stutter,... (even runs smooth when I play it with the dropbox player inside the browser,..)
I also checked the ffmpeg file again and for me it doesn't stutter,... (even runs smooth when I play it with the dropbox player inside the browser,..)