I need a simple crop; no scaling or any other pixel manipulation

[PHPhotoGraphics]

I need to output a 4K video at the "standard" 4K pixel dimensions of 3940 x 2160.  Unfortunately, my camera's native resolution is 4096 x 2160.  I just want to crop 78 pixels each off the left and right edges to get to 3940 x 2160 and then output the clip at 3940 x 2160.  The crop tool will crop by percentage, but I can't find a way to hit EXACTLY 3940 pixels wide. And even then when I change the output dimensions to 3940 x 2160, I still get black bars on the top and bottom.

Isn't there a simple way to get rid of those "extra" 78 pixels on the left and right edges without scaling or in any other way manipulating the central remaining 3940 x 2160 pixels -- and then output those pixels (without black bars) at 3940 x 2160?

[R Neil Haugen · Accepted solution]

I would set the sequence settings manually to that frame-zsize, making sure the default "scale to frame-size" is unchecked.

I think that will do.

Neil

[SAFEHARBOR11]

Are you sure you don't mean 3840 rather than 3940? UHD 4K video is 3840x2160 (twice the size of HD).

Yes, Neil is correct. Just create a sequence at desired dimensions. Drop your footage into timeline (when it asks if it should change timeline to match clip, say NO). The larger clip will be centered in the smaller frame. Export at desired dimensions. Done.

Thanks

Jeff

[PHPhotoGraphics]

Thanks, Neil and Jeff.

Yes, I meant 3840, not 3940.  Thanks for pointing that out.

I'm new to the idea of creating or editing sequences, but it does not look like I can edit the sequence resolution setting for my current clip to 3840 x 2160.  I can't break the aspect ratio link, so changing the width from 4096 to 3840 also changes the height to 2025.

My question is this:  my clip has already had Lumetri color, unsharp masking and warp stabilizer applied to it.  Do I need to delete the existing clip, create a new sequence at 3840 x 2160, drag my origin video into that sequence and then re-apply my lumetri color, unsharp masking and warp stabilizer to that new sequence?

Or is there a way to salvage the work done so far and just apply the new resolution to the existing clip?

[SAFEHARBOR11]

Warp Stabilizer requires clip dimensions to match sequence dimensions. Might get around this by Nesting sequences.

As for color effects, sharpening, etc. that do not involve scaling, then yes you can move clips to other sequences with effects intact.

First though, see if you can modify existing sequence - change Editing Mode to Custom from the drop down, then you ought to be able to change dimensions freely.

If you need to copy current edits to new sequence, create the new sequence. In old sequence, do Select All (Ctrl A) then Copy (Ctrl C) then go to new sequence and Paste (Ctrl V). This will move all edits over with effects and transitions intact.

Thanks

Jeff

[PHPhotoGraphics]

Thank you, Jeff.

I'm sorry, I've tried everything I can think of (and searched the Adobe online Help site) but can't find a drop down list anywhere which gets me to the Sequence Setting dialog box you show in your reply.

When I select the sequence (from the project panel), right click and select Sequence Settings, this is the Sequence Settings dialog box I see:

Where / how do I get to the drop down which allows me to change to Custom editing mode?

[R Neil Haugen]

The very top line ... where it says "Editing mode" and is currently set for DNxHR 4K? Click on that line, and Custom is at the top of the list.

Neil

[PHPhotoGraphics]

A thousand thanks, Neil.

I found it, but rather than select custom and then set everything manually I just changed the editing mode from DNxHR 4K to the one right below it, DNxHR UHD.  That changed the horizontal resolution from 4096 to 3840 without changing anything else.  I rendered the file overnight and it looks great - and IS a UHD file.

There is one other question that's been on my mind relative to speeding up playback (uniformly) of a video, and I'm not sure if I should ask it here or start a new thread.

Here is the situation:  the clip I rendered last night had an original edited length of 102 seconds.  One client will be using it on their website (hosted by YouTube, and I'll use Media Encoder to create the YouTube 1080p HD file) and wants the running length to be 75 seconds.  I did successfully use the Speed/Duration tool last night (134.04%) to get this 102 second video down to 75 seconds before rendering last night, but last week I was getting NOTHING but VERY jittery playback with any video I tried to output using Time Remapping.  The stutter was so bad I would not even show the results to the client.

From what I read, changing the playback speed with either Time Remapping or Speed/Duration results in some manipulation of the image data (Frame sampling, frame blending or optical flow), and it seems to me that any time there is image manipulation there is going to be at least a slight degradation of image quality.

So is there a way to take the frames that made up the 102 second video (2,445 frames, I think) and play back those 2,445 frames in 75 seconds, not 102 seconds?  If that could be done, it seems to me, no image or frame manipulation of any kind would be needed, and therefore there could be no possible image degradation and/or other artifacts introduced.

Let me know if you think this should be a separate thread, and thanks, again, for you help.  Without it my deadline was in serious jeopardy.

[Ann Bens]

New question? Make a new thread.!!

[PHPhotoGraphics]

Got it, Ann.  Thanks.

[R Neil Haugen]

You're most welcome, of course, and you found an elegant solution.

And I agree with Ann ...

Neil