Video after encoding doubles in length

[lindylex]

I’m trying to encode video for 5th generation video ipod using the following commands.

This is a 15 second portion of the original.
http://mo-de.net/ffmpeg/help_me_please.mp4

Broken mp4
http://mo-de.net/ffmpeg/bad_help_me_please.mp4

Broken mov
http://mo-de.net/ffmpeg/bad_help_me_please.mov

These are the ffmpeg commands that I used.

This generates video and audio playing slowly because the encoded video is twice the play length of the original.

ffmpeg -i help_me_please.mp4 -vcodec libxvid -b 300 -qmin 3 -qmax 5 -bufsize 4096 -g 300 -acodec libfaac -ab 128 -s 320x180 -aspect 16:9 bad_help_me_please.mp4

This also generates video and audio playing slowly because the encoded video is twice the play length of the original.

ffmpeg -i help_me_please.mp4 -f mov -b 1800 -maxrate 2500 -vcodec libxvid -qmin 3 -qmax 5 -s 320x180 -acodec libfaac -ab 96 -aspect 16:9 bad_help_me_please.mov

ffmpeg –version

lex@trabajar:/home/share/del/free_tutorials/a$ ffmpeg -version
FFmpeg version SVN-r13582, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --prefix=/usr --libdir=${prefix}/lib --shlibdir=${prefix}/lib --bindir=${prefix}/bin --incdir=${prefix}/include/ffmpeg --enable-shared --enable-libmp3lame --enable-gpl --enable-libfaad --mandir=${prefix}/share/man --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-libamr-nb --enable-libamr-wb --enable-x11grab --enable-libgsm --enable-libx264 --enable-liba52 --enable-libtheora --extra-cflags=-Wall -g -fPIC -DPIC --cc=ccache cc --enable-swscale --enable-libdc1394 --enable-nonfree --disable-mmx --disable-stripping --enable-avfilter --enable-libdirac --disable-decoder=libdirac --enable-libschroedinger --disable-encoder=libschroedinger --disable-altivec --disable-armv5te --disable-armv6 --disable-vis
libavutil version: 49.7.0
libavcodec version: 51.58.0
libavformat version: 52.16.0
libavdevice version: 52.0.0
libavfilter version: 0.0.0
built on Oct 4 2010 18:36:29, gcc: 4.3.2
FFmpeg SVN-r13582
libavutil 3213056
libavcodec 3357184
libavformat 3411968
libavdevice 3407872

uname –a

Linux trabajar 2.6.27.8 #1 SMP Thu Dec 18 02:01:11 EST 2008 x86_64 GNU/Linux

What is the best ffmpeg command to encode videos for the 5th generation video Ipod?

[TJohns]

...This generates video and audio playing slowly because the encoded video is twice the play length of the original.

Well, the video's ok (on the MP4 anyway) ... the audio is playing back at the wrong rate, stretching the entire playback time. Maybe you need to specify the framerate (30) rather than let it guess??

[lindylex]

"specify the framerate (30) rather than let it guess??" I did this already. When you try this what happens?

[lindylex]

[ SOLVED SOLUTION ]
My solution required me to add "-ar 44100" to the ffmpeg command. I noticed ffmpeg has a problems with all my original videos with the following audio encoded "Audio: aac, 22050 Hz, stereo, s16, 135 kb/s"

ffmpeg -i help_me_please.mp4 -f mp4 -vcodec mpeg4 -vtag xvid -maxrate 1000 -qmin 3 -qmax 5 -bufsize 4096 -g 300 -acodec libfaac -mbd 2 -s 320x180 -padtop 30 -padbottom 30 -ab 128 -ar 44100 -b 400 some_movie.mp4