How is the iPad processing 5.1 AAC

Lately I happened to have a video file which has AC3 audio. I tried to change the container from MKV to MP4 with Subler for iTunes and my iPad but it didn't work with my iPad (syncing failed).
Previously I've always had either AAC stereo only or AC3 Surround + AAC stereo (Dolby Pro Logic II). So I figured that it may have something to do with only having AC3 in my video file.
Next thing I did was converting the audio line of the video file with Handbrake (along with low settings for the video so it doesn't take too long) to AAC. But not Dolby Pro Logic II or normal Stereo but AAC Surround (6 channels). I've never done that before but after merging the new audio with the H.264 video in Subler syncing with my iPad worked without a flaw.
But since the iPad can only play stereo through it's speakers / headphone cable (and I know it can push AC3 through the adapter but I am not using this) I am wondering what the iPad is doing with the center channel + surround channels.
Am I loosing the additional content when I am listening to it with headphones or does the iPad downmix it to stereo?
And one additional question: Did the syncing really fail because the video file had only AC3 in it?
Off-Topic: Thanks to the moderator who accuses me of doing illegal actions which is ridiculous. Someone who plucks something out of the air shouldn't be a moderator in this community.

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