how to apply filter over SPECIFIC parts of a single file?

[bongoyvr]

I have a 30 minute avi and I just want to apply filters at specific points on the footage..NOT ALL OF IT.

is there a trick in VS9 so I can do this selective application of filters in a timeframe?

[rwindeyer]

The easiest way would be to scan through the clip, and use the scissors tool to cut it into separate clips at the appropriate points. Then apply the filter to those clips where it is needed.

[chuckpuckett]

I have a similar situation, and sort of dislike the idea of creating clips just to apply filters (Occam's Razor, and all that). I was just doing some research, and I wonder if setting key frames around the part that needs filtering has any utility? Before and after the key frames, seems like you could set the filter settings to essentially NULL, then apply the filter with non-null settings between the key frames.

I'm at work and can't try it yet. And anyway, I'm a newbie to VS, so such an idea probably tons of hidden "gotchas". Still...

Chuck "nothing ventured, etc..." Puckett

[THoff]

Cutting the clips to apply filters doesn't split up the source video, it just lets you treat sections of the video as separate entities so you can manipulate them.

[bongoyvr]

Cutting the clips to apply filters doesn't split up the source video, it just lets you treat sections of the video as separate entities so you can manipulate them.

true...but if you have neighbouring transitions and things it messes up the audio/video sync...

i have a few transitions in another 30 min file but if i add a cut I get 2 sec increase in length of video...and since i am using a preset voice wav as the sound for the footage i get out of sync

is there anyway to do a "filter mark in/out" without doing the cut which changes the time

[bongoyvr]

is there anyway to do a "filter mark in/out" without doing the cut which changes the time

anyone?

[Masami]

Well, if you don't want to cut up the video, you can do the following with most filters, but it's not exactly simplifying the process.

1) Apply the filter to the whole thing.
2)Go into the filter and set whatever settings there are to 0 or equality points so in effect the filter is doing nothing (Some filters can't do this)
3)Still in the filter commands, find the point you want to start the filter. Click the add key point command
4) Find the point you want the filter to stop and add a key point there.
5) Go to one frame past the first key point you created. Add another key point and adjust it to your liking.
6) Go to one frame before the second key point you created. Add another key point and adjust to your liking.

For example, let's use brightness to make the image lighter. Let's say that we want the filter to last from 30 seconds in to 60 seconds in.

1) Apply brightness to the video clip.
2) Go into the brightness filter and set the brightness slider to 0 on the first and last key points.
3) Go to 00:00:30.00 and add a key frame
4) Go to 00:01:00.00 and add a key frame.
5) Go to 00:00:30.01 and add a key frame. Set the brightness to 50.
6) Go to 00:00:59.99 and add a key frame. set the brightness to 50.

Now the scene will become brighter frome between 30 and 60 seconds.

[Keith C]

Masami - absolute TOP tip!...I just tried this and it works perfectly. As you rightly show, you need to add the extra keyframe points a frame after and a frame before you want the filter to become active. The mistake I have been making was just to add keyframes where I wanted the filter to start and stop and of course this just brings the effect in and out gradually.

Also thanks for taking the time to put a "walk through" example in. So much easier to follow a specific set of instructions.

Cheers

Keith

[bongoyvr]

thanks for the tutorial but the auto exposure filter has no adjustment ability