Applying the patch (gpac-v0.6.1.diff), MP4Box becomes to be able to accept -sbr and -ps when importing MP4.
In other words, MP4Box will be able to change signaling of AAC in MP4 without demux which may cause out-of-sync.
> MP4Box -info AVC_HE-AAC.mp4 2>&1 | grep LC
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 24000
> MP4BoxSBR -add AVC_HE-AAC.mp4 -sbr -new new_AVC_HE-AAC.mp4