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sbin 10-06-2007 12:17 AM

Anybody encoding for iPhone?
Sorry, didn't know which forum this should go in. Please move if I got it wrong. :)

I haven't visited these forums much in the last few years because with the availability and capacity of DVD-R and DVD-R DL, I had sort of thought KVCD compression techniques were neat but pretty much moot. However, now that I have a shiny new iPhone and space is once again at a premium, the fun is back. :D

I'm currently using Quicktime Pro to export to iPhone and it looks great, but I'm not at all satisfied that I'm getting the best quality/compression ratio out of my files. Right now, QT is getting a 45-min episode of Doctor Who into ~300MB at 480x272. But because just about nothing with Apple is transparent, I'm really not sure what's going on behind the scenes with the encoding. CQ, CBR, or VBR? Min/max bitrate? etc...

I found a pretty good resource here:

Based on that information, I've managed to produce some iPhone-legal files with megui that come in well under 200MB, but at a noticeable quality drop. That's no good, of course.....

So I knew exactly where to come. :D

Has anybody experimented with this yet, or am I out there by myself?

Dialhot 10-06-2007 06:05 AM

KVCD Notch is aimed to MPEG2 encoding, it has never been of great interrest for MPEG4 (whatever the flavour), that is probably what iphone uses. isn't it ?

sbin 10-06-2007 09:42 AM

Yeah, I know that... I'm not trying to use existing KVCD techniques (outside of a few scripting ideas). I'm thinking more in terms of a "start from scratch" approach because we're talking about x264 encoding, which is fundamentally different and new to me. I've mostly always used Mpeg-2.

I realize that Mpeg-4 isn't the focus of these forums, but this is the only forum I know of where this kind of extreme quality/compression work has been done. People said 2hrs on a CD was impossible, and then KVCD made it work. You guys are the best at stretching the boundaries of the possible. I want to get the very best I can out of the limited space in my iPhone, and this just seems like the best source of knowledge around.

Dialhot 10-07-2007 07:33 AM

Ok :). I can't speak for the others, I never encoded any x264 except to test some tools :oops:

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