[Steve Cohen]

Pierre,
I’ve been experimenting with this all weekend and haven’t had much luck.

This time I’m in PP. The material looks like the sample frame I uploaded — B&W, running at 12 fps. To avoid the double nest, I an interpreting the source footage as 24 fps, cutting it into a 24 fps sequence and then applying Twixtor and setting it to 50% speed. This works well, but produces jello-grain artifacts in some scenes.

To test De:Noise, I created a new sequence with two video layers. First layer (v1) has Twixtor+DeNoise, Second layer (v2) has Twixtor alone with Alternate Motion Source set to V1. I’ve experimented with different amounts of noise reduction. Latest experiment has the least I’ve tried: Spatial Radius=4/Spatial Threshold=25, Temporal turned off (Process Mode=none). But still, the resulting file has what looks like blended frames rather than Twixtored, optical flow frames — as if every other frame is a little dissolve of the adjacent frames.

Do you have any suggestions? What am I doing wrong?

Many thanks,
Steve

[Steve Cohen]

Pierre,
I’ve been experimenting with this all weekend and haven’t had much luck.

This time I’m in PP. The material looks like the sample frame I uploaded — B&W, running at 12 fps. To avoid the double nest, I an interpreting the source footage as 24 fps, cutting it into a 24 fps sequence and then applying Twixtor and setting it to 50% speed. This works well, but produces jello-grain artifacts in some scenes.

To test De:Noise, I created a new sequence with two video layers. First layer (v1) has Twixtor+DeNoise, Second layer (v2) has Twixtor alone with Alternate Motion Source set to V1. I’ve experimented with different amounts of noise reduction. Latest experiment has the least I’ve tried: Spatial Radius=4/Spatial Threshold=25, Temporal turned off (Process Mode=none). But still, the resulting file has what looks like blended frames rather than Twixtored, optical flow frames — as if every other frame is a little dissolve of the adjacent frames.

Do you have any suggestions? What am I doing wrong?

Many thanks,
Steve

[Steve Cohen]

I tried De:Noise quite a while ago and thought it only softened this material. It’s really grainy — 8mm original. Not even Super-8. Attaching a sample. ‘

grainyblackandwhite.png

Steve

[Steve Cohen]

I tried De:Noise quite a while ago and thought it only softened this material. It’s really grainy — 8mm original. Not even Super-8. Attaching a sample. ‘

grainyblackandwhite.png

Steve

[Steve Cohen]

Pierre,

Now that I’ve got the workflow issues sorted out, I have a question about artifacts. I’m using Twixtor on old 8mm movies that I’ve had transferred as HD TIFF sequences. Most are 18 fps in color with reasonably good exposure. This stuff converts to 24 nicely and it really improves the sense of reality. 18 looks like a silent movie. 24 looks ‘real’.

But I have a couple of rolls shot in B&W at 12 fps in a theater. Converting this to 24 is more problematic. When there is clear, sharp foreground action all is well. But when there are large expanses of underexposed, undefined grainy grey or black, Twixtor turns the grain into what looks like shimmering, moving jello. I’ve fooled with the settings and haven’t been able to get rid of it. Do you have any suggestions?

Thanks,
Steve

[Steve Cohen]

Pierre,

Now that I’ve got the workflow issues sorted out, I have a question about artifacts. I’m using Twixtor on old 8mm movies that I’ve had transferred as HD TIFF sequences. Most are 18 fps in color with reasonably good exposure. This stuff converts to 24 nicely and it really improves the sense of reality. 18 looks like a silent movie. 24 looks ‘real’.

But I have a couple of rolls shot in B&W at 12 fps in a theater. Converting this to 24 is more problematic. When there is clear, sharp foreground action all is well. But when there are large expanses of underexposed, undefined grainy grey or black, Twixtor turns the grain into what looks like shimmering, moving jello. I’ve fooled with the settings and haven’t been able to get rid of it. Do you have any suggestions?

Thanks,
Steve

[Steve Cohen]

Thanks Pierre, that worked. No idea why — it seems counter-intuitive that changing the speed to 133% with PP’s tools would actually make Twixtor do something, but it did the trick.

I had a problem with the first frame, too. It’s the first frame of a fade in and it bumped — no smooth fade. I think I need to apply the fade to the last sequence in the chain.

Thanks again —
Steve

[Steve Cohen]

Thanks Pierre, that worked. No idea why — it seems counter-intuitive that changing the speed to 133% with PP’s tools would actually make Twixtor do something, but it did the trick.

I had a problem with the first frame, too. It’s the first frame of a fade in and it bumped — no smooth fade. I think I need to apply the fade to the last sequence in the chain.

Thanks again —
Steve

[Steve Cohen]

Pierre,
Is the procedure the same if I’m working entirely in Premiere?

If I want to convert an edited 18 fps sequence to 24 with twixtor — would I nest the 18 fps into another 18 fps seq at 100%, then nest again into a 24 fps sequence? Or do I have to tell it to run at 75% somewhere?

Steve

[Steve Cohen]

Pierre,
Is the procedure the same if I’m working entirely in Premiere?

If I want to convert an edited 18 fps sequence to 24 with twixtor — would I nest the 18 fps into another 18 fps seq at 100%, then nest again into a 24 fps sequence? Or do I have to tell it to run at 75% somewhere?

Steve