audio problem converting .mov ffmpeg

[wiziwiz]

I am using latest ffmpeg and this code all other videos are fine except a large .mov the sound is stutterirng

ffmpeg -i VID.mov -vcodec libx264 -preset fast -crf 23 -threads 0 -vf scale="720:trunc(ow/a/2)*2" -acodec libfaac -ab 256k -ar 48000 wed5.flv

think it is to do with aac and libx264

[wiziwiz]

o.k. found the problem it was the audio codec libfaac so I changed to libmp3lame