AME - Converting to MP4 and different FPS - audio goes out of sync

As described in the title.
I'm reencoding a 1920x1080 29,97 fps video into a 1280x720 60 fps video. Audio is AAC 44100 stereo.
Basicly a task that many of those free converters on Windows do smoothly. I use Mac...
I'm surprised that it goes out of sync, like 3-4 secs EARLY sound on a span of 2 mins video.
Settings here:
AME CS6 Fully updated
source: 1920x1080 29,97fps MP4 with AAC 44100hz audio
Target:
Codec: H264
Saves as : MP4
1280 x 720
60 fps Progressive - NTSC
CBR VBR1 VBR2 doesn't matter
Max rendering quality
Codec Audio AAC 44100hz (as source)
Any ideas ?

Because we stream at 60 fps and we have to convert all the materials we receive from our partners from the usual 29,97 to 60.
Thanks for your MVPaluable help.
/sarcasm off

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Message was edited by: Youtuber
Message was edited by: Youtuber

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(Not sure why this response was originally rejected by the moderators, but am trying again.)
A solution that worked for us:
[EDIT] I do NOT work for any of the companies included in this solution, nor do I receive any kind of renumeration from them. I am recording the software and steps we used to overcome the problem of the original poster.[END EDIT]
The Skype Call Recorder (Ecamm) has 4 built-in converter/splitter apps (you have to look in the "Movie Files" folder to find them). We used the apps to split the recorded Skype video calls into 2 separate "conversations" and then used a free online converter (http://www.online-convert.com/) to convert the conversations into MP4s. Once the MP4s were imported into Adobe Premiere the audio lined up perfectly with the video.
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(Note to moderators: a message containing the "why" a reply was rejected would be helpful when members are trying to edit.)

AME - Converting to MP4 and different FPS - audio goes out of sync

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