[MEncoder-users] Recoding RM files for iPod

[Ulf Magnusson]

On Dec 27, 2007 1:21 PM, Ulf Magnusson <ulfalizer at gmail.com> wrote:
>
> On Dec 27, 2007 5:36 AM, James Hastings-Trew <jimht at shaw.ca> wrote:
> > RC wrote:
> > > On Wed, 26 Dec 2007 16:52:39 -0600
> > > James Hastings-Trew <jimht at shaw.ca> wrote:
> > >
> > >
> > >> iTunes won't download them to the ipod unless the "itunes" atom is set
> > >> to the correct value.
> > >>
> > >
> > > That's only true for 640:480 h.264 videos.  He's using 320:240, which
> > > works fine without any hacks.
> > >
> > Very first time I've heard that. Thanks for the tip.
> >
> >
> > _______________________________________________
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> > MEncoder-users at mplayerhq.hu
> > http://lists.mplayerhq.hu/mailman/listinfo/mencoder-users
> >
>
> Actually, I managed to get it to work without using that hack, and
> with 640x480 encoding, using the following:
>
> # Dump sound
> mplayer -channels 2 -novideo -hardframedrop -ao pcm:file=$1.sound.wav $1
> # Convert sound
> faac --mpeg-vers 4 --obj-type LC -o $1.sound.aac $1.sound.wav
> # Convert video
> ~/svnmp/bin/mencoder $1 -o $1.video.264 \
> -channels 2                             \
> -of rawvideo                            \
> -nosound                                \
> -ovc x264 -x264encopts qp=20:keyint=60:nocabac:level_idc=30 \
> -vf scale=640:480,dsize=640:480,harddup
>
> # Combine into MP4 container
> /usr/local/bin/MP4Box -add $1.video.264 -add $1.sound.aac $2 -brand
> isom:1 -fps 15.000  # it's a RM, 15 fps is correct
>
> That produces a file that iTunes will copy to the iPod, and that plays
> great, except for one thing. I recoded the file from
> http://ocw.mit.edu/ans7870/6/6.046j/f05/lecturenotes/ocw-6.046-07sep2005-220k.rm
> . When playing back the result on the iPod, the video freezes around
> 14:22 (when he says "does not affect your grade") but the sound keeps
> playing. It you attempt to seek past that point, you are taken back to
> 14:22. This only happens on the iPod, and not in QuickTime. Any ideas
> what could be wrong, and how you could fix it?
>
> /Ulf
>

The iPod is a third generation nano with the latest firmware, in case
it's helpful. I'm using iTunes on OS X.

/Ulf