Audio is 1 frame longer than video after encode

My .ac3 files are coming up 1 frame longer than they should be on SOME encodes. Unfortunately, I can't see any noticeable pattern to which files it happens to. It occurs on anything from audio-only files created in Soundtrack to an FCP video/audio export. It's happened on both a DV sequence as well as a DVCPRO HD sequence. It's a bit unnerving to see the audio longer than the video, even if it is one frame because the end product is slightly (1 frame, I'd reckon) out of sync. I've tried setting a specific out point in my sequence and got the same effect.
Does anyone have any ideas? Anyone else having their audio come up 1 frame too long on a Dolby encode?
Thanks,
Cameron

Anyone else having their audio come up 1 frame too long on a Dolby encode?
Yes.
The rest is longwinded with no answer to the problem.
First the system config.
Dual 1.8 GHz PCI-X G5
4 GB Ram
Media drive: 800 GB Raid FW 800
(4 discs, 2 on internal bus, 2 on LaCie FW 800 card)
162 MB/s Read, 91 MB/s Write.
FCP 5.1.2
Compressor 2.3
DVD SP 4.1.1
I created a 16 minute NTSC DVC PRO50 sequence, audio at 48KHz 16 bit.
Not having a person recorded talking for that length of time I created a series of one frame "pops" of color bars and tone, followed by 10 seconds of video and audio slug.
This sequence was copied and pasted to fill the timeline with a single frame of the "pop" at the very end.
Everything perfectly in sync.
I nested the sequence and rendered.
No matter how the 16 minute timeline was exported and compressed to MPEG-2, 7 Mb/s and Dolby 2.0 192 Kb/s.
(direct export to Compressor, export of audio and video separately or sequence export, then to Compressor)
there was always an audio sync error once imported to the DVD SP timeline.
Not an entire frame out, but on zooming to max in the timeline in SP, about 7/8 of a frame extra.
If I exported just the last 1:21 min of the NTSC DVC PRO50 timeline, and compressed with the same settings, the extra audio length was about 3/4 of a frame over.
Next I exported the NTSC DVC PRO50 timeline as a DVCPRO HD100 1080 60i QT sequence.
Cut the last 1:21 min and imported to Compressor.
Compressed as 19 MB/s MPEG-2 and Dolby 2.0 192 Kb/s.
Created a new DVD SP HD project and brought the files into the timeline.
Zoomed in at the end, and the error in sync was minimal, not perfect, but difficult to make out even at full zoom.
Anyone have any suggestions to get things, at least Standard Definition, perfectly in sync?

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Complete name : /Users/tester/Movies/export-tests/test24trailer.mpg
Format : MPEG-PS
File size : 12.9 MiB
Duration : 12s 576ms
Overall bit rate mode : Variable
Overall bit rate : 8 614 Kbps
Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@High
Format settings, BVOP : Yes
Format settings, Matrix : Default
Format settings, GOP : Variable
Duration : 12s 533ms
Bit rate mode : Variable
Bit rate : 7 995 Kbps
Maximum bit rate : 38.8 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
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Frame rate : 59.940 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
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ID : 189 (0xBD)-128 (0x80)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
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Duration : 12s 576ms
Bit rate mode : Constant
Bit rate : 448 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 688 KiB (5%)

Audio is 1 frame longer than video after encode

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