18fps export in Premiere

Hi everyone,

First, thanks to Vouk for his work

My goal is to export Premiere sequences to 18fps with Voukoder.

It worked in one single case and failed in all others.

Constraints

- Premiere CC 2015 doesn't support 18fps natively (not in sequence, not in export)

- the input footage contains a 18fps film stored @ 25fps (encoded with DNxHR that supports 25fps but not 18fps)

Test 1

- input footage interpreted frame rate: 25fps

- sequence timebase: 25fps

- speed of clip in the sequence: 72% (=18/25*100), frame sampling

- Voukoder export framerate: 18fps

Result: the speed is correct, but some frames are replaced by a copy of the adjacent frame (frames missing and frames duplicated)

Test 2

- input footage interpreted frame rate: 25fps

- sequence timebase: 60fps (max supported)

- speed of clip in the sequence: 72%, frame sampling

- Voukoder export framerate: 18fps

Result:

sequence of 536 frames; KO, same as Test 1

sequence of 900 frames; KO, same as Test 1 (900 = common multiple of 18 and 25)

sequence of 3620 frames; KO, same as Test 1

sequence of 7380 frames; KO, same as Test 1

sequence of 3628 frames; OK, the speed is correct and all frames are exported properly !

Test 3

- input footage interpreted frame rate: 15fps

- sequence timebase: 60fps (max supported)

- speed of clip in the sequence: 120% (=18/15*100), frame sampling

- Voukoder export framerate: 18fps

Result: same as Test 2

Setup

Windows 7 64bits, Premiere CC 2015.2, Voukoder 8, Premiere connector 1.7.0

Any idea on what could cause the discrepancy in the results ?

Zitat von jbress

Premiere CC 2015 doesn't support 18fps natively (not in sequence, not in export)

In fact, it's not entirely true. It seems not documented, but Premiere CC 2015.2 can in fact work with a 18fps sequence.

To create a 18fps sequence, follow these 2 steps :

1 Clip > Right click > Modify > Interpret > Frame rate > Assume 18fps

2 Clip > Right click > New Sequence From Clip

That's it. You have a 18fps sequence, that you can then export properly using Voukoder

The only drawback is that you must not edit the sequence settings afterward, because it would reset the frame rate to 10fps by default