Is there a way of delaying the video to compensate for an audio plugin that's used for an entire track which then delays the audio?

For example, I was using iZtope RX6's De-click for an entire track and it delays the audio. It does give you a precise measure of the delay but not sure what to so with that number.

The workaround is to put the effect on each clip and render.

Thanks

Do you mean it is gradually drifting out of sync as time goes on? 

No Scott - it's a fixed delay.

Because it's a track effect and it's being done in realtime, you can't render it. iZotope will tell you exacly how much the audio is being delayed by. It happens with the De-click effect as that requires some heavy processing.

You could go in there and shift the video track along by that amount but that will make a mess of the timeline. The idea is that you feed that delay into whatever tool your using so the compensation takes place in the background and audio & video are back in sync. I suspect that this is something you can do in a DAW like Pro Tools.

iZotope do have something called RX Connect. This allows you take the audio from a clip into the standalone tool, do the necessary repairs etc., and then it sent back to your timeline. That stops the need to export/import audio manually every time you want to make a change as it's all done in the background. Avid gave RX6 Elements as part of the Loyalty Offer. Unfortunately, you need the Standard version of iZotope to get RX Connect.

I don't have much experience with this but that sounds like a bug in iZotope - given that it knows how much it has delayed the audio, I wonder why it doesn't shift it back when rendered so that the rendered result is sync'd with the original audio? As I say, I don't have much experience with this so maybe I am missing the obvious.

Sorry - reading more closely I see that you are referring to this problem before rendering - is that true? When rendered is everything back in-sync (i.e., if you export the sequence is the export sync'd correctly)?

This is a audio track effect you apply through the Audio Track Effect Tool. So, there is no rendering involved - you can't render it. All iZotope are saying is that that using this effect will cause an X number of miliseconds delay. It's all being done in realtime.

It's convenient in that you apply the effect to all the clips at once and not have to render. The idea is that you compensate the video with that amount of delay. The alternative is to put the effect on each clip and render.

I think iZotope can explain it bettter than I can: https://support.izotope.com/hc/en-us/articles/360033886113-Latency-and-Delay-Compensation

This is a audio track effect you apply through the Audio Track Effect Tool. So, there is no rendering involved - you can't render it. All iZotope are saying is that that using this effect will cause an X number of miliseconds delay. It's all being done in realtime.

It's convenient in that you apply the effect to all the clips at once and not have to render. The idea is that you compensate the video with that amount of delay. The alternative is to put the effect on each clip and render.

I think iZotope can explain it bettter than I can: https://support.izotope.com/hc/en-us/articles/360033886113-Latency-and-Delay-Compensation

I'm not sure you are going to find an easy solution to fix an issues created by a plugin.

Can you not just save a preset of the effect to your bin, then select all clips and batch apply it to all clips?

Sounds like the solution on your end is to not have it do the entire timeline at once...convenient as it sems...doesn't really sound too convenient at all if it buggers everything else up.

Acually, i just read their explaination. 

Sounds like they are saying. "ya we know we've buggered up your sync...maybe you can fix it somewhere else"

Not what I want to hear.

There are a couple of console commands that you can try to use and see if you can get your playback into sync. These are:

moncondel frames - delay the video by the number of frames indicated.

desktop play delay frames - delay the audio by the number of frames indicated.

Note that these are both temporary. You have to reset them each time you go into Media Composer. Also these are global commands which will affact all of your playback, so you have to reset them to zero for timelines without the real-time Izotope filter.

HI there

Created a case 04018094 and asked support to reach out to our develoepr contact and see about connecting with iZotope and see what the scoop might be.

Marianna

mtahir:

This is a audio track effect you apply through the Audio Track Effect Tool. So, there is no rendering involved - you can't render it. All iZotope are saying is that that using this effect will cause an X number of miliseconds delay. It's all being done in realtime.

Well, you CAN do an audio MIXDOWN of such a track.  That is, in effect, rendering it.

Jef

Thanks Jef.

One thing I noticed after the mixdown is that I couldn't align the audio with the original. The delay isn't on a frame boundary but it seems to be ok.

I'm still playing with the parameters, so I don't want to do a mixdown until the end. I'll just have to live with the delay. I suppose I don't really need to look at the picture as it's just the audio I'm processing.

mtahir:

Thanks Jef.

One thing I noticed after the mixdown is that I couldn't align the audio with the original. The delay isn't on a frame boundary but it seems to be ok.

I'm still playing with the parameters, so I don't want to do a mixdown until the end. I'll just have to live with the delay. I suppose I don't really need to look at the picture as it's just the audio I'm processing.

I would imagine that this is because the processing delay is in samples which do not add up to a complete video frame.  If you figure out exactly how much processing delay the de-click tool is creating, you could add another of the RT effects to the track which lets you add more delay.  Do some math and experiments and you could get it to be an even frame and then slip the track back by a frame.

Jef

I think the number is in milliseconds. That's an interesting idea. Thanks.

 Since version 8.1, Media Composer will play and mix down with delay compensationapplied, but it is limited to 16K samples (at 48Khz sample rate). When the plug-in requires more than 16K samples of delay compensation, as in this case, there will be some slip.