FCP Sound Syncing Question

Hey Everyone,
I have an audio syncing question for you. Any help would be greatly appreciated!
I am cutting in FCP. I logged and captured my footage and with timecode breaks, etc. the tape was cut up, and I was left with eight files, let's call them Footage1-Footage8. I have completed my cut of the piece using the in-camera audio that was linked to the video on the DV tape that I imported. Our sound guy in the field used a DAT recorder to record the production audio and apparently captured the timecode to the audio files, so that it matches the video (i.e. the DAT recorder and our cameras - DVX-100s had synced timecode during the shoot). The DVD he gave me has 20 audio files as .wav, let's call them Audio1-Audio20. My question is, now that I have finished my cut, I would like to replace the current audio tracks with the production audio. How can I sync the audio with the video and replace it in what I've cut. Or perhaps I can't, in which case - how can I sync them up and THEN cut, but I'd really rather have to not do that, lol!
Thanks for your advice!

Sorry about the long winded post, though.
I guess my real question, summarized is - is there a way to sync separately recorded production audio (that has timecode) with the footage that I shot (that has the same timecode as the audio, but also has in camera audio that accompanies the video track - I would imagine I can just "cut" the extra audio tracks, however).
I'm at my bay trying to figure this out, and I've got nothing, and the people I work for don't want to spring for that bwf2xml program you were talking about What's the emote for pulling one's hair out?

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d-trick wrote:
For example, say you have a frame where the slate is just about to hit and it was moving fast, so fast there's motion blur, but there's a small enough space where you know the sound hasn't happened yet, maybe only a centimeter or less. Obviously the next frame shows the slate closed, and you can guess the slate actually touched between the time each frame was exposed, probably even closer to the previous frame.
So, where exactly to place the waveform? At the beginning of the frame where it's closed, or at the end of the previous frame where it would have happened in real life?
Here's a silly attempt at an illustration of the dark area representing a single frame on the timeline and the waveform underneath:
{Single frame}{Single frame}
.................||......................
{Single frame}{Single frame}
.....................||..................
So in this case I'd say the first is 'correct' for film or interlaced video at a high shutter speed. At low shutter speed I'd say it's a toss up, it's too hard to tell if the sticks shut in the time between frame 1 and frame 2 being exposed or just too early in frame 2 to produce any detectable motion blur. That said, I don't think anyone would be able to tell the difference between the two anyway.
Of course in an app that doesn't support subframe editing the alternatives would actually be
{Single frame}{Single frame}
.................||......................
{Single frame}{Single frame}
......................................||.
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Metalink note 34592.1 has been mentioned several times in this forum as well as elsewhere, notably here
http://christianbilien.wordpress.com/2008/02/12/the-%E2%80%9Clog-file-sync%E2%80%9D-wait-event-is-not-always-spent-waiting-for-an-io/
The question I have relates to the stated breakdown of 'log file sync' wait event:
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3. Time for the log write I/O to complete
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Nonetheless, it seems to me that this extra delay could only be a maximum of 12ms so this still leaves 10ms (34 - 12 -12) that can only be accounted for by CPU usage.
Clearly, my analsys contains a lot of conjecture, hence this note.
Can anybody point me in the direction of some facts?

Tony Hasler wrote:
Metalink note 34592.1 has been mentioned several times in this forum as well as elsewhere, notably here
http://christianbilien.wordpress.com/2008/02/12/the-%E2%80%9Clog-file-sync%E2%80%9D-wait-event-is-not-always-spent-waiting-for-an-io/
The question I have relates to the stated breakdown of 'log file sync' wait event:
1. Wakeup LGWR if idle
2. LGWR gathers the redo to be written and issue the I/O
3. Time for the log write I/O to complete
4. LGWR I/O post processing
5. LGWR posting the foreground/user session that the write has completed
6. Foreground/user session wakeup
Since the note says that the system 'read write' statistic includes steps 2 and 3, the suggestion is that the difference between it and 'log file sync' is due to CPU related work on steps 1, 4, 5 and 6 (or on waiting on the CPU run queue).
Christian's article, quoted above, theorises about 'CPU storms' and the Metalink note also suggests that steps 5 and 6 could be costly.
However, my understanding of how LGWR works is that if it is already in the process of writing out one set of blocks (let us say associated with a commit of transaction 'X' amongst others) at the time a another transaction (call it transaction 'Y') commits, then LGWR will not commence the write of the commit for transaction 'Y' until the I/Os associated with the commit of transaction 'X' complete.
So, if I have an average 'redo write' time of, say, 12ms and a 'log file sync' time of, say 34ms (yes, of course these are real numbers :-)) then I would have thought that this 22ms delay was due at least partly to LGWR 'falling behind' in it's work.
Nonetheless, it seems to me that this extra delay could only be a maximum of 12ms so this still leaves 10ms (34 - 12 -12) that can only be accounted for by CPU usage.
Clearly, my analsys contains a lot of conjecture, hence this note.
Can anybody point me in the direction of some facts?It depends on what you mean by facts - presumably only the people who wrote the code know what really happens, the rest of us have to guess.
You're right about point 1 in the MOS note: it should include "or wait for current lgwr write and posts to complete".
This means, of course, that your session could see its "log file sync" taking twice the "redo write time" because it posted lgwr just after lgwr has started to write - so you have to wait two write and post cycles. Generally the statistical effects will reduce this extreme case.
You've been pointed to the two best bits of advice on the internet: As Kevin points out, if you have lgwr posting a lot of processes in one go it may stall as they wake up, so the batch of waiting processes has to wait extra time; and as Riyaj points out - there's always dtrace (et al.) if you want to see what's really happening. (Tanel has some similar notes, I think, on LFS).
If you're stuck with Oracle diagnostics only then:
redo size / redo synch writes for sessions will tell you the typical "commit size"
redo size + redo wastage / redo writes for lgwr will tell you the typical redo write size
If you have a significant number of small processes "commit sizes" per write (more than CPU count, say) then you may be looking at Kevin's storm.
Watch out for a small number of sessions with large commit sizes running in parallel with a large number of sessions with small commit sizes - this could make all the "small" processes run at the speed of the "large" processes.
It's always worth looking at the event histogram for the critical wait events to see if their patterns offer any insights.
Regards
Jonathan Lewis

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