Re: Problems creating video for iPod

To start, you might:

1) Create a version of your movie, for example as uncompressed frames, 320x240.

2) Then open it in QT Player and export using "Movie to iPod".

3) Open the resulting movie in QT Player, and look at the data rates with Window > Show Movie Properties.

This should tell you at least what data rate is possible for your movie with H.264 and AAC. And if you are able to export a movie in QT Player which works on the iPod (I know you said you originally weren't able to do this), you can modify the QTKitPlayer sample code, which can do the export in code--I have done this.

As for doing the compression yourself, I'm not sure what combination of sequence compression settings you need to use. Maybe someone else more knowledgeable than me on this list can help with that--I would be interested to know too...

Stewart Milberger

Megaptera, Inc. (www.megaptera.com)

On Jun 30, 2006, at 3:40 AM, Jerry wrote:

On 26 Jun 2006, at 11:33, Jerry wrote:

On 26 Jun 2006, at 11:27, Jerry wrote:

I'm trying to create movies for the iPod using QuickTime and can't get it to work. I export a movie with one video track, no audio, 320x240, 30FPS, H.264 encoding, put it into iTunes, "Update iPod" and iTunes says it can't copy it to the iPod because it "cannot be played on this iPod". I've tried MPEG2 with the same results. The weird thing is that even if I use QuickTime Player to convert the movie to iPod format or use the iTunes "Convert to iPod" function, the resulting movie has the same problem. Any ideas? Do I need a sound track? Is there any application available which will tell me exactly what is wrong with the movie? The catch-all iTunes message is less than helpful.

Looks like I've solved my own problem - adding an empty sound track to the movie seems to cure it.

False alarm. It turns out that the problem is nothing to do with sound, but I think is to do with the data rate. The major problem I have here is that I don't know *why* iTunes is rejecting my movie and I'm just having to guess. A better error message or an application which checked movies for iPod compatibility would be a huge boon.

So, I'm trying to create a 2-second long movie for the iPod, but I can't get the data rate down to below 768 Kb/s. I suspect this is because the movie is visually fairly busy (animated satellite images with graphic overlays) and keyframes are being generated practically every other frame. Now, no matter what settings I give to the H.264 compressor, I still get similar results. I've set visual and temporal quality to minimum, set the data rate in SCDataRateSettings to every value I can think of, told it to generate keyframes every 100 frames and so on and on to no effect. If I ask iTunes or QT Player to convert the movie to iPod for me, it gets slightly better results but the data rate is still too high and iTunes still won't allow it to be copied to the iPod.

Any ideas? Am I just going to have to give up on the idea of putting this type of movie on an iPod?

Jerry

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	>Problems creating video for iPod (From: Jerry <email@hidden>)
	>Re: Problems creating video for iPod (From: Jerry <email@hidden>)
	>Re: Problems creating video for iPod (From: Jerry <email@hidden>)