DVD audio/video sync question

[DeadLily]

This is tricky to explain, so bear with me, I'm going to go into a lot of details.

My equipment and software is limited, and I want to edit a 5.1 soundtrack from a DVD in Final Cut Pro. To get the six tracks, I'm coming out of a DVD player with 6 RCA outs, one for each channel. I'm converting the signal to 48 Mhz aif through a Canopus ADVC-100, simultaneously with the picture. Since the Canopus only has 2 RCA inputs, I plan to do it in 3 passes, capturing the picture along with it each time. Then I'll sync up the 3 pairs in FCP by lining up the frames. I'm concerned that each pair be exactly in sync with the others.

So let me ask my question like this...

Assuming that the video is exactly 30 fps (which I know it isn't), and that the audio gives me exactly 48000 samples per second, and that therefore each picture frame gets 1600 samples. For this plan to work, when Picture #1 appears on the screen, the player then plays Sample #1, then Sample #2, etc all the way to Sample #1600. Then Picture #2 displays, as Sample #1601 plays, then Sample #1602, etc.

Finally the question: Is DVD playback as precise as this illustration? If it is, then by lining picture frames up in FCP, all six channels should be perfectly in sync, right down to Sample #1. If not, then I'm assuming that this approach will give me phase problems.

[SaSi]

Partial response.

Why not rip the audio stream (guess it's AC3) from the video and then further strip it into individual WAV files using Besweet? Will save you an awful lot of time and frustration.

[indolikaa]

Partial response.

Why not rip the audio stream (guess it's AC3) from the video and then further strip it into individual WAV files using Besweet? Will save you an awful lot of time and frustration.

Agreed.

Assuming this works, you'll have three captured streams that will have to be aligned to each other. Without any timecoding, and given the delay associated with 6-channel sound, that could either be an unnoticable issue or a train wreck waiting to happen.

The Canopus is well-known for its ability to lock the audio stream to the video stream. In theory, this shouldn't be a problem; you should just have to line all three of them up to the correct frame and then break them down into the 6 channels.

Good luck.

[DeadLily]

The Canopus is well-known for its ability to lock the audio stream to the video stream. In theory, this shouldn't be a problem;

In theory... but only if in fact the DVD plays Sample #1 exactly the same time every time the DVD is played.

I appreciate suggestions, but as I said, my resources are limited, so they are not what I'm asking for. I simply want to know if a DVD player is precise enough to play back every sample at the same time for any playback. If anyone can confidently answer that, I'd appreciate it.