ffmpeg conversion to iPhone 4

[jrsx13]

Hello I am using the following command:

#!/bin/bash
# usage ffmpeg2iphone.sh (SOURCE) (X) (Y)
ffmpeg -i "$1" -s $2x$3 -threads 0 -vcodec libx264 -level 31 -profile main -acodec libfaac -ac 2 -ar 48000 -ab 160k output.mp4

And most of the time the file is playable on my phone, but sometimes iTunes won't transfer it. I think I have located the issue, on the files I can play the media info shows:

"Format settings, GOP : M=4, N=16" (Where the numbers are on occasion different)

And on the files it can't play, the whole line is missing. Any help from you guys on what to put in, to ensure that the GOP information is there (and/or standardized) for iTunes?

[jrsx13]

Turned out to be a bad input file I think. I sent it through this and then encoded it with the above post and it works.

#!/bin/bash

mencoder "$1" -ovc xvid -xvidencopts bitrate=1024ass=1:threads=4 -ffourcc XVID -oac mp3lame -lameopts preset=standard -vf harddup -o /dev/null
mencoder "$1" -ovc xvid -xvidencopts bitrate=1024ass=2:threads=4 -ffourcc XVID -oac mp3lame -lameopts preset=standard -vf harddup -o output.avi