Your description indicates one of the recent models of the GoPro. Would like to have a 5 to 10 sec. Sample clip recorded of the same description attached on your next reply to check out on my system.

As tomasc requested, please upload a short clip to OneDrive or Google Drive and post a publicly-sharable link here.

It would also help to see the technical details of your computer. Follow the steps in the Read Me Before Posting guide to attach the DxDiag test results.

Hi matthew MJB -

I shot a few clips today on my GoPro 10, with settings that match what you've described (MediaInfo attached).

HEVC - 3840x2160 - 119.880fps - 99.6Mbps

I tried to replicate your issue, but couldn't in PDR21. The speed settings I used matched those shown in the Video Speed settings info, under Interpolation Setting info (see attached screenshot). You didn't mention what speed you adjusted your clip to. Did it match the ones shown in the screenshot? If not, that may be part of the problem.

For anyone who'd like to test, you can download this GoPro clip. Don't expect to see a 70 year old snowboarding, skating or BMX riding (!)

Cheers - Tony
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Thanks for the clip, Tony! I also don't see any issues with applying interpolation or when producing the slowed-down clip in PD365, so I think OP's DxDiag test results will hold some important clues.

It would be nice if OP provide some exact steps. I'm not even sure how to replicate what was stated as it states "apply the Interpolation setting after I slow down". I'm not sure how you do it after the slowdown, I'm only aware of two spots with an interpolation setting, Video Speed and Action Camera.

At least OP could use Tony's clip to see if issue repeats so then others could verify with proper steps.

Jeff

I tested the GoPro clip supplied by Tony. Slowed a range of the 12 second clip down and using the interpolation technology and produced it with no problem.

This being a short uhd 4k 120 fps clip required no shadow files. I normally use shadow files for editing my GoPro 4K 60 fps videos in the past. The codec must have been improved.

Quote Your description indicates one of the recent models of the GoPro. Would like to have a 5 to 10 sec. Sample clip recorded of the same description attached on your next reply to check out on my system.

Hi Tomasc

Sorry I didnt see your reply here is a clip.

I tried again to reduce the speed by 0.250 and apply interpolation again.

The frame rate in the project is 25fps.

thank you.

Quote I tried again to reduce the speed by 0.250 and apply interpolation again.

The frame rate in the project is 25fps.

thank you.

Nothing to do with GoPro source, PD21 can't do interpolation with 9:16 video source.

As a workaround you can produce your clip in a 16:9 frame, keeping fps and near quality, and then do frame interpolation with this as source. If your end project is 9:16, you can zoom in on the 16:9 frame to 9:16 prior to video speed adjustment.

Jeff

Quote

Nothing to do with GoPro source, PD21 can't do interpolation with 9:16 video source.

As a workaround you can produce your clip in a 16:9 frame, keeping fps and near quality, and then do frame interpolation with this as source. If your end project is 9:16, you can zoom in on the 16:9 frame to 9:16 prior to video speed adjustment.

Jeff

Hey thanks Jeff,

I will try flipping it to 16.9 and see how that works out thank you again.

Quote Nothing to do with GoPro source, PD21 can't do interpolation with 9:16 video source.

What's the reference for this? There's no warning that you're attempting to do something problematic. No graying-out of interpolation, or even simply not applying that option if it was previously selected but now you're trying to use it on a 9:16 clip, PD happily accepts the request then dives into oblivion

Well, that's got me!

When I read mathew MJB's first post, I took the "2160x3840" to be a typo. Not so.

Anyway - I've just discovered the Orientation Lock on the GoPro & shot a few 9:16 clips... then followed the same steps I'd used previously:

1. Import clip into a 9:16 project
2. Adjust video speed to 0.25
3. Check frame interpolation option in settings - Apply
4. Return to timeline - check playback
5. Produce to standard 9:16 profile

Next, I tested the same procedure on some 9:16 clips from different phones. No issues that I can see.

When trying to apply the Interpolation setting after I slow down GoPro footage Power Director always crashes.

In my testing PDR21 didn't show a hint of balking at the task, let alone crashing. Nor did it throw up any alerts that what I was attempting was inappropriate.

Jeff - I've been scratching around in the help file & I can't find any reference to frame interpolation not applying to 9:16 videos. Could you please give me a poke in the right direction?

Cheers - Tony
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OK - I'll have to eat my words (above)

With the 9:16 videos tested, when I step through the produced files frame-by-frame there is NO frame interpolation evident... just 4x the same frame. There are no intermediate frames generated.

That is not the case with the 16:9 clips.

As you were

Cheers - Tony
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Very strange, as I can't get past clicking on OK in the Video Speed tool if I've set it to 0.25x with the Interpolation box checked when using OP's clip. I get the timeline view back with the clip at the original length, then PD365 completely hangs instead of adjusting the duration. PD17 shows the same behavior.

If Interpolation is unchecked, everything works fine in both versions

That 9:16 video is going to require shadow files to be enabled in my system whereas the 16:9 one worked properly without them.

optodata -

I've been using PDR21 (perpetual) in my testing. Haven't tried it in PDR365. Maybe I'll do that & see if there's any different outcome.

I got the same results using matthew MJB's clip as the others I'd previously tested. (side-by-side MediaInfo attached).

Cheers - Tony
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I tested the process using matthew MJB's clip in PDR365, without a hitch. PDR did what was asked of it (except applying frame interpolation).

Cheers - Tony
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On my system, which now has PD365 v21.5.3001, the only way to prevent PD from hanging after reducing the video speed with the Interpolation box checked is to disable hardware decoding.

Once that was done, I could produce the clip and every single frame is different - so interpolation seems to be working properly now with this 9:16 clip. Download the produced video from here and see for yourselves. It's buttery smooth at 30fps.

matthew MJB, go to Preferences | Hardware Acceleration and uncheck the Hardware Decoding box. I produced using NVENC hardware encoding, so the issue is only on the hardware decoding side.

This issue should be reported to CL

Quote Once that was done, I could produce the clip and every single frame is different - so interpolation seems to be working properly now with this 9:16 clip. Download the produced video from here and see for yourselves. It's buttery smooth at 30fps.

You might want to have another look at interpolation, try 0.20 video speed which also supports interpolation, you will see the last two frames 4 and 5 are the same and simply duplicated. 0.25 works as source is 119.88fps. No interpolation is done.

Jeff

Quote What's the reference for this? There's no warning that you're attempting to do something problematic. No graying-out of interpolation, or even simply not applying that option if it was previously selected but now you're trying to use it on a 9:16 clip, PD happily accepts the request then dives into oblivion

optodata, like most things, does a reference exist for:
1) Variable bitrate MP3 files not working properly
2) Highly variable fps video not working properly
3) Highly variable bitrate video not working properly
4) Hardware decoding not working properly
5) Hardware encoding not working properly
6) Timeline preview render not working properly

Just to name a few, I think you get the point, the reference you ask of is like most PD things, just user experience, that’s all. After all, is not the stated forum objective to “Share your knowledge and experiences of video editing with PowerDirector 21“. If you want a reference on what interpolation technique PD uses and what exact video’s are supported, contacting CL for an answer would be suggested, good luck with an appropriate answer! In the meantime, it’s just users sharing what they have observed, I’ve never seen 9:16 interpolation work for me yet, hence the statement. The workaround I provided has worked for me at times. Always welcome being proved wrong though, everyone gains.

Jeff