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Slo Mo Cascades

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Slo Mo Cascades

Postby Dave McElderry » Mon Jul 20, 2020 11:23 am

Okay, I'd like some input on this one. A short 45 second vid. I took some slo mo footage of some cascades a few weeks ago and I'm not real pleased with the results. This is the first time I've tried this - iPhone SE2, native Apple app. Aside from the lighting conditions being somewhat low I can't figure out what went wrong. I was using the gimbal, and there's very little movement involved. The results are disappointing. It almost looks very low res, or out of focus (although it's neither). The clarity is poor. Is there anything that I could have done differently that would have helped? Not sure what to expect, but this wasn't it.

A couple of notes. The weather was partly cloudy when we left home, but when we got to within about 10 miles of West Milton a storm came in from the west and the sky opened up, raining as hard as I've seen in years. Traffic was slowed to about 30 mph. Although it was still raining lightly when we arrived, we decided to walk down to the cascades. The falls normally have a "veil" look, but the rain had turned them into more of a torrent, which did make it more interesting.

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Re: Slo Mo Cascades

Postby sidd finch » Tue Jul 21, 2020 9:38 am

Dave Did the camera use a variable bit rate when recording? That might be causing some issues. Also was the file recorded in that HEVC codec? I know that the HEVC codec does not work well in video editors.

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Re: Slo Mo Cascades

Postby Dave McElderry » Tue Jul 21, 2020 12:25 pm

sidd finch wrote:Dave Did the camera use a variable bit rate when recording? That might be causing some issues.

Beats me. Not meaning to be flip. Does the iPhone use VBR?

Also was the file recorded in that HEVC codec? I know that the HEVC codec does not work well in video editors.

MediaInfo just says the codec is "qt" (which I assume means QuickTime), and "avc1". I can tell you that I've never had problems with iPhone video in PrEl V11. It's always given me good results. Of course I just did upgrade my phone to the SE2. Don't know if that makes a difference. I haven't done much recording with it using the native app - mostly Filmic Pro. Here's what MediaInfo says about the file:


MediaInfo.jpg
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Re: Slo Mo Cascades

Postby sidd finch » Tue Jul 21, 2020 1:58 pm

Dave constant frame rate (good news) and looks love an MP4 file in MOV container so no HEVC, but the 30fps indicates something happened if you recorded in 120 fps. Looks like that might be a cause. It is also 720p footage, not sure if you wanted that or something larger.

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Re: Slo Mo Cascades

Postby Dave McElderry » Tue Jul 21, 2020 2:53 pm

Well, I missed the setting for HD and it had apparently defaulted to 720. It has two slo-mo options: 720 at 240 fps, or HD at 120 fps. So I don’t know why it reports 30 fps. Would this have something to do with the playback speed? That is, 240 divided by 30 = one eighth speed?

I suspect that the biggest problem is that I wasn’t recording in Full HD. Duh. I’ll revisit this next chance I get and make sure I’m in the right mode. Thanks!
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Re: Slo Mo Cascades

Postby sidd finch » Tue Jul 21, 2020 3:17 pm

Dave in regards to the 30fps I think it is how you put the media on your computer to edit.

I my case once I plug the phone to computer I use the windows file explorer to to cut and paste the file to my hard drive. In this way the file should then be whatever it was recorded at. 720P at either 240 or 120 fps.

Once on the computer and ready to edit on PRE I then slow the footage down in the video editor, for example reduce speed to 20% which gets it to play slow. Is this how you are doing it too?

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Re: Slo Mo Cascades

Postby Dave McElderry » Tue Jul 21, 2020 3:51 pm

I was never able to access the phone using File Explorer so I usually use one of several methods, depending on circumstances. I have a utility that allows Windows to see the phone and work with its files, or I use iTunes, or in this particular case I used Dropbox to transfer the file. I can’t imagine how that would have changed the file though. The interesting thing is, I didn’t mess with the speed once it was on the timeline. It was playing in slo-mo so I didn’t give it much further thought. I don’t get it. It’s problems like this that have boggled the great minds of science and made them soft.
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Re: Slo Mo Cascades

Postby sidd finch » Tue Jul 21, 2020 5:11 pm

What I do for my iPhone is to plug into computer. Enter the phones pass-code to open up. Then, The phone has a pop up that says trust this computer. At that point the drive will show up in windows explorer. Dble click on the folder and it should be in one of the folders.

My guess is that the way you are doing it you are not getting the original file but something that was processed so it now plays slow at 3fps. When I do it I get the 720P file in 120 or 240fps.

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Re: Slo Mo Cascades

Postby Dave McElderry » Tue Jul 21, 2020 5:37 pm

I still have the original on my phone so I’ll try a different way to transfer. Years ago I used to use File Explorer the way you describe, but something changed and I was no longer able to do that. Next chance I get I’ll see if I can get it to work that way.
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Re: Slo Mo Cascades

Postby Dave McElderry » Wed Jul 22, 2020 11:19 am

Okay, I was once again able to access the iPhone via File Explorer. That's a good thing. I hadn't tried it in a long time. MediaInfo reported the 240 fps on the clip this time so you're right, Sidd, that the clip had been processed somehow the first time. I've reworked (and reposted) the video and I can say that it's "significantly improved" but not great. I'd like to try this again in 1080. Thanks for your insights Sidd! Very helpful. :TU:
Be yourself; everyone else is taken.

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Re: Slo Mo Cascades

Postby sidd finch » Wed Jul 22, 2020 11:43 am

Dave it does look better. Glad it was able to work out for you.

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