Movies - Multiple audio tracks strange problem

This is a strange problem.
I have a .mov with 2 audio tracks. One italian (the first and active) and one english. The movie is compatible with ATV.
Using QuickTime Pro I can choose the language while watching the movie.
Using iTunes I see the movie with the first language selected on preferences (cmd+j on QuicTime Pro).
On ATV the same movie plays just English, the second language, and this is quite strange.
Does anyone have the same problem?
Greetings
Mac OS X (10.4.9)

Hmm, I don't really know. I have converted the DVD with 128 kbps for the two audio traks (stereo).Sounds like I need to go back and run additional tests. For my first attempt, I used two stereo tracks -- each 128 Kbps @ 44.1 KHz. For latest test used two mono tracks with the first 64 Kbps @ 44.1 KHz (keyed to English) and the second 32 Kbps @ 32 KHz (keyed to Italian).
I create a m4v video, I open with QuickTime Pro and work on the preferences for audio traks, than I save with mov extension.Had assumed we were both using similar strategies to create alternate audio movies here. Basically I create the movie with two audio tracks and then open the "Properties" window, select the first audio track (which is already set for English), set the alternate audio track pop-up for Audio Track 2, select the second audio track, set the language pop-up to Italian for this one, and use the Save As... menu option to create a Fast Sart, Standalone movie in the MOV container.
In this way I have a perfect double-language movie that, as I told, works perfectly on QuickTime and iTunes.Did have one question though. When you say you have a "perfect double-language movie that ... works perfect on QuickTime and iTunes," are you saying you can change the language in iTunes while the movie is playing? While I have no problem changing language using the "Choose language" menu command in the QT player, I have yet to be able to find a way to do this while playing in iTunes.
UPDATE: to temporally solve the problem I have changed the infos on movie properties. Calling the English audio track "Holland" (or any other language that is listed after Italian) I have solved the problem. On Tv, iTunes and Quicktime I can hear the "default" language (italian) and, just changing again the properties, I cand hear the second language.I think we are doing the same thing only I did not bother/have to use and additial language setting to get this to work.
In this case Audio Track 2 (Italian) is the default.
In this case Audio Track 1 (English) is the default.
Thus, for my test, I created two separate movies with each defaulted differently and played them back in each program/device to see which audio track played. In each case it was the "checked" default audio track and changing the "Language" setting for TV to Italian had no effect.

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