Cannopus Issue

[Energie]

Hey there

I am using the ADVC110, well trying to. I am using pro tools LE, quicktime vid inside PT, all is well with the world inside pro tools. Video is perfectly in sync the whole time. Try to send it out the firewire port, and it goes, only its out of sync, delayed by at least several frames. I tried lowering my buffer size to very small to see if it was latency, connected both digital and analog video to the monitor, still no resolve. Is there anything I can do? thank you.

[Stephen Muir]

Have you set the video offset? DV playback generally has a playback latency of 6 to 12 quarter frames. Fortunately, the playback offset will be consistent, so you just have to set the video offset.

Perhaps another Canopus user can provide the exact offset for that device.

[Energie]

Originally Posted by Stephen Muir

Have you set the video offset? DV playback generally has a playback latency of 6 to 12 quarter frames. Fortunately, the playback offset will be consistent, so you just have to set the video offset.

Perhaps another Canopus user can provide the exact offset for that device.

Ooo, yeah, I was thinking that may be the thing. If I set the offset, it won't effect anything come later? I don't remember having to do that before.

[pisser]

try 22 quarter frames. Should get you close. Get Syncheck to be sure

[Energie]

Originally Posted by pisser

try 22 quarter frames. Should get you close. Get Syncheck to be sure

Offsetted the movie by 22 quarter frames and it looks right in the pocket. Thank you ever so much. I am assuming i need to do this everytime then? I don't remember doing this a few years ago, and I don't think audio sync was ever an issue. Does LE have something to do with this and not TDM?

[Soundproof]

" Does LE have something to do with this and not TDM? "

Nope. It's the same in TDM/HD. This is because the Canopus needs a bit time to work on the way.

[Energie]

Ahh, Canopus is a wee bit slow on Z uptake, But I hold nothing against him, he's still ok in my book.


Thanks much for the info, good to know.

[Stephen Muir]

You'll experience some latency with any DV transcoder, this isn't an issue peculiar to the Canopus.

[kk@jamsync.com]

Originally Posted by Stephen Muir

Have you set the video offset? DV playback generally has a playback latency of 6 to 12 quarter frames. Fortunately, the playback offset will be consistent, so you just have to set the video offset.

Perhaps another Canopus user can provide the exact offset for that device.

We're at 12 quarter frames here with PTHD on a G5 2x2, but it used to be greater on a G4.

I made a small movie with a 1-sample click and a 1-frame white flash every second for 10 seconds. I usually just loop that and adjust the offset. Occasionally, I've brought it out and played it when a movie looked out of sync in certain places.

One thing to remember: when you trash prefs, the offset GOES AWAY and gets reset to 0!! It is NOT stored with the session file!!

[Pedro_vde]

Indeed the video delay offset is not stored in your session but in your PT-prefs. It's also a fact that the delay depends from system to system. If you do a playback on a CRT or TFT there is also a difference how those monitors handle the signal... so you have to tweak depending on your setup. (we have 4 setups and they all differ a slight bit)

The only thing you may not forget is to turn it off when bouncing to a QT-movie... otherwise the result is off-sync.

Kind regards from Belgium

Pedro

[santacore]

The only thing you may not forget is to turn it off when bouncing to a QT-movie... otherwise the result is off-sync.

Good point, it's got me a few times.

Besides plasmas, what other monitors have a delay?

[Darentsmith]

I've been at 18 quarter frames here, just goes to show that you should buy a sync check just to be sure...

It will also change depending on the tv/monitor/projector you are using - we have one room with an LCD thats at 18 qf offset, the plasma screens in the big room are at a 35 qf offset.

FWIW

Daren

[seanmccoy]

I run my DV out through a Canopus ADVC-100, and I've been trying to track down a little sync quirk that's happening between my rendered audio files and the video editor's system. Using Syncheck II and its supplied test files, I have discovered, to my great surprise (and possibly relief, if this solves the mystery), that there is a 2 frame latency difference between 29.97 and 23.976. Is this normal, expected behavior, or am I off my rocker? Or both?

[minister]

since your TV does not really play 23.976, but, rather Quicktime does the 3:2 pull to get to 29.97 so it can displayed. I wouldn't be surprised if this took a hit on latency.

you always have to check the whole system, codec, frame rate and all...each one can be slightly different.

[seanmccoy]

Originally Posted by minister

you always have to check the whole system, codec, frame rate and all...each one can be slightly different.

Thanks, Tom, I see this now. I naively assumed that after I had checked and adjusted the system once I could shelve the Syncheck. Obviously not true! It will always be right at my side from now on. That way I'll really feel I'm getting my money's worth out of it, too.

[Mydog_Nixon]

16 quarter frames here.

[seanmccoy]

Originally Posted by Mydog_Nixon

16 quarter frames here.

Is it always 16 quarter frames, regardless of the framerate?

[TVPostSound]

Is it always 16 quarter frames, regardless of the framerate?

No its different on different frame rates, it changes with different CPU speed, and loads.
It also changes from one play command to the other.

Canopus is not a true professional solution.

I have used it in the past.

[seanmccoy]

Originally Posted by TVPostSound

No its different on different frame rates, it changes with different CPU speed, and loads.
It also changes from one play command to the other.

Canopus is not a true professional solution.

I have used it in the past.

I have seen this too. Though in my Syncheck tests I've been able to get consistent results, these are not performed under real world conditions.

What is the true professional solution for broadcasting QT and AVI files in sync onto multiple monitors?