MeGUI Anamorphic and Ipod Touch (or iPhone)

[JRH147]

Been looking everywhere for an answer to this and I think I just don't understand it quite right -

Ripping DVD to MP4 for use on my iPod Touch - rips work great - look great - no problems overall - except that they are all squished in appearance.

I checked "Clever Anamoprhic" and here is my log for the latest:

avis [info]: 704x448 @ 23.98 fps (191270 frames)
x264 [info]: using SAR=259/220
x264 [warning]: VBV bitrate (12000) > level limit (10000)
x264 [info]: using cpu capabilities: MMX MMXEXT SSE SSE2
x264 [warning]: VBV maxrate specified, but no bufsize.
mp4 [info]: initial delay 0 (scale 24000)
x264 [info]: slice I:1879 Avg QP:19.96 size: 27824
x264 [info]: slice P:189391 Avg QP:22.36 size: 4989
x264 [info]: mb I I16..4: 31.7% 0.0% 68.3%
x264 [info]: mb P I16..4: 2.8% 0.0% 2.2% P16..4: 38.8% 16.5% 1.6% 0.2% 0.1% skip:37.9%
x264 [info]: kb/s:999.9

But when I go to play it in either Quicktime or on the Touch it won't unsqueeze it.

What exactly am I doing wrong here? Thanks.

[Sharktooth]

How does it look on the PC?

[JRH147]

It's squashed when I play it through the Quicktime on the PC.

[nurbs]

Could you try the clip in VLC, MPlayer or something like that. If it works there you know that Quicktime and the touch don't support anamorphic. Else something went wrong during encoding or muxing. The log looks good anyway

[Ronin-7]

I think I read somewhere that the Handbrake devs found some hack that allows QuickTime to play anamorphic content properly but you would have to use their program for that. Plus even if that works no idea if it will work for the touch.

Are you playing these from the TV out of the Ipod Touch ?

[tuber99]

Yes, I've been on this "mission" myself the past few weeks. I'm targeting the AppleTV, however, not the iPod. But the issue is the same. Yes, the Handbrake devs figured it out - but it was actually documented on Apple's website all along (rather cryptically, I must say)

QuickTime Matrix Info (http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap4/chapter_5_section_4.html)

This transform matrix is stored in the last 36 bytes of the moov.trak.tkhd.reserved3 property of the video track and controls the display aspect ratio of the video playback.

I am going to start working on a new build of Mp4Creator that will take care of this (and some other QuickTime quirks that have been bothering me). I'll post a WIN32 test build when I have something working.

[bond]

moved

[minski]

Hi!

I just did some experiments with my iPod Touch. What I also noticed is, that the iPod Touch does not seem to care about anamorphic videos.

I transcoded a short sequence with full PAL-resolution (720x576) into a raw H.264 stream using MeGUI. The video should show up with 1050x576 because of its "anamorphicness". When I open the raw stream with mplayer the video is shown correctly, as well as with VLC.

To get this clip working with Quicktime, i had to mux it into a .mp4 container (using the MeGUI mp4 muxer). And YES, Quicktime plays it correctly and all the other players too.

But transferred to my ipod, it shows up as 720x576.

I got that little apple-app called Dumpster and modified some fields. The matrix seems to be checked by Quicktime and the video is stretched by the value I enter there. BUT the iPod Touch does not seem to recognize that matrix.

Since the iPod is able to scale nearly any video resolutions to fullscreen, I guess that there's a hardware scaler built in. So it should be pretty painless for Apple to implement anamorphic video support.
I just cannot believe, that this is impossible.

Has anybody made an anamorphic video working on the ipod touch?
How can this be done?

Thanks in advance.

[thomasphoenix]

Got anamorphic working on ipod touch ,encoded as 16:9 in
handbrake and remuxed in the latest yamb with ratio of 32:27

the video plays like a normal anamorphic on quicktime and vlc and squeezes in ipod touch into the correct aspect ratio.