Rendering 60fps video to 30fps, what is best practice?

Rich Parry schrieb am 08.01.2019 um 22:46 Uhr

When my source media is 1080P @ 60fps and my deliverable is 1080P @ 30fps I can either Enable  resampling in which case VP will blend the 2 frames to 1 (I think) or I can Disable resampling in which case VP will drop the extra frame (I think).

Is there a preferred sampling setting for ingesting 60fps video when the final output is 30fps?

Thanks in advance,

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Rich in San Diego, CA

Kommentare

3POINT schrieb am 08.01.2019 um 23:18 Uhr

Best way is to disable resampling when rendering 60fps to 30 fps. Rendering will go much faster and ghosting of moving objects due to blending of 2 frames into 1 will not happen.

Musicvid schrieb am 08.01.2019 um 23:29 Uhr

+1

Rich Parry schrieb am 09.01.2019 um 02:41 Uhr

Thank you for the reply. I have been doing as you suggested, but it was only a guess. I wanted to hear from experts what I was doing was correct.

Thanks again,

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3POINT schrieb am 09.01.2019 um 06:56 Uhr

I,m not an expert. I often change framerates 48/24 60/30 or 50/25 fps and got best and quickest results with disabling the resampling in the project settings. On my TV, I hardly can see any difference between the high or low framerates. Also nice to realize smooth slomos at half speed.

klt schrieb am 09.01.2019 um 07:07 Uhr

Just my 2 cents: I generally disable resample in the project properties (use 50p from my camera, but my output is always 25p). I switch on "force resample" on events on which I use some change in speed, which would not result in a frame perfect speed-up or slowdown. For example making a 50% slow motion from 50p to my 25p output does not require resample enabled. But adding an event veloctiy gradually speeding up from zero to 66% would require it. I found that disabled resample in these situation produces a more jittery move.

NickHope schrieb am 09.01.2019 um 08:50 Uhr

+1 for disable resample.

What is your reason for not delivering in 60p?

3POINT schrieb am 09.01.2019 um 12:46 Uhr

What is your reason for not delivering in 60p?

Maybe decreasing rendering time by half, saving filespace, producing a none action movie, a cinematic effect...to my opinion 50/60 fps for delivery is mostly overkill.

Rich Parry schrieb am 09.01.2019 um 16:50 Uhr

I do not deliver 60p because my media often consists of multiply frame rates (e.g., 30 and 60). In addition, I may slow down the frame rate such as when I add a velocity envelop. I believe it is best practice to deliver 60p only when all your media is 60p.

Thanks again to all that took the time to reply and help

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Rich in San Diego, CA

EricLNZ schrieb am 09.01.2019 um 23:56 Uhr

What is your reason for not delivering in 60p?

Maybe decreasing rendering time by half, saving filespace, producing a none action movie, a cinematic effect...to my opinion 50/60 fps for delivery is mostly overkill.

You only save filespace by having a lower bitrate as bitrate is per sec not per frame. A 25 fps file at X bitrate should be virtually the same size as a 50 fps file at X bitrate.

Personally I find 25 fps jerky when there is sideways movement across the screen which is close or fast. 25fps isn't enough for my eyes/brain to perceive it as continuous smooth movement. Yes I realise we used to shoot 8mm film at 16/18 fps and it looked smooth. But film is very different to digital.

OldSmoke schrieb am 10.01.2019 um 00:00 Uhr

Yes I realise we used to shoot 8mm film at 16/18 fps and it looked smooth. But film is very different to digital.

@EricLNZ Last year I converted plenty of my father’s and grandfather’s 8mm film shot at 16fps and no, no no, it doesn’t look smooth.

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EricLNZ schrieb am 10.01.2019 um 00:19 Uhr

@OldSmokeI did all mine ten or more years ago using the crude method of projecting onto a small screen and capturing at 50i on a Panasonic GS500 SD tape camera. My only jerkiness is gate judder plus some ghosting where my Panasonic camera captured two film frames. A lot of mine was cycle racing material with sideways movement.

OldSmoke schrieb am 10.01.2019 um 01:01 Uhr

@EricLNZ I used a RetroScan 8 Pro, it scans each picture and I imported it as an image sequence at 16fps in 16fps project and that is not smooth at all but would be exactly as viewed with a projector at the right speed.

These are all hand held shot home movies, mostly shot with an Eumic C3 M on double 8mm film and no image stabilization what so ever. The oldest film is from 1939 and the last one from 1989. After that my father had a Panasonic VHS-C video camera, the quality is worse then the 8mm film. It only got better in the 90s with the first Super 8, I believe it was called VHS-S and later with my first camera, a Sony Digital 8. VHS-S was almost on par with the 8mm film, Digital 8 was ok but HDV was a game changer.

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EricLNZ schrieb am 10.01.2019 um 04:38 Uhr

@OldSmoke I cannot recall my original film movies being jerky when projected on my old Eumig projectors and I used to show my cycle racing ones on a big screen. My projectors no longer work properly so cannot check. The projectors had a three bladed shutter so each frame was shown three times. This avoided flicker as you need 50 images per sec flashed before you to fool the eye/brain into seeing continuous motion. But you were still only seeing 16/18 different images per sec. When you imported your scans into a 16fps project what did you render out as?

We've got a bit OT but here's an example. One of my best and 50 years old now!

3POINT schrieb am 10.01.2019 um 07:02 Uhr

What is your reason for not delivering in 60p?

Maybe decreasing rendering time by half, saving filespace, producing a none action movie, a cinematic effect...to my opinion 50/60 fps for delivery is mostly overkill.

You only save filespace by having a lower bitrate as bitrate is per sec not per frame. A 25 fps file at X bitrate should be virtually the same size as a 50 fps file at X bitrate

That's true, but when you render to 25/30 fps instead of 50/60 fps you can lower the bitrate by about 33% to achieve the same pcture quality. Check the Vegas rendertemplates, the 25/30 fps templates use lower bitrates than the 50/60 fps rendertemplates, so resulting in less filespace.

25 fps can look jerky with sideways movement when (wrong) recorded with too high shutter settings with no motion blur. Remember: movies are recorded with just 24 fps, do they look jerky?

OldSmoke schrieb am 10.01.2019 um 12:15 Uhr

Remember: movies are recorded with just 24 fps, do they look jerky?

@EricLNZ To me they do when ever there is fast motion, like action scenes or sports.

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OldSmoke schrieb am 10.01.2019 um 12:39 Uhr

When you imported your scans into a 16fps project what did you render out as?

@EricLNZ The last time I also rendered a 16fps file and uploaded to YT and it even played it back as 16fps. It just isn’t smooth and I am looking for better way.

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3POINT schrieb am 10.01.2019 um 12:57 Uhr

I never tried this before, but maybe setting your project to 30 fps and rendering with 30 fps with smart resampling on, gives a smoother view.

OldSmoke schrieb am 10.01.2019 um 13:00 Uhr

I never tried this before, but maybe setting your project to 30 fps and rendering with 30 fps with smart resampling on, gives a smoother view.

I tried that but it only looked marginally better.

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Dexcon schrieb am 10.01.2019 um 13:03 Uhr

I'd love to know how footage from the late 1800s and early 1900s - which would have to have been shot using hand-cranked cameras presumably at 16fps or thereabouts - have been converted to relatively smooth, relatively non-jerky 24/25 fps at a real-to-life speed (i.e. as though it were shot at 24/25fps) in some recent History Channel documentaries.

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Musicvid schrieb am 10.01.2019 um 17:14 Uhr

I think Twixtor gets used a lot for this.