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After Effects’ Time Stretch effect in Sony Vegas without resampling (ghosting)?
Hi all,
I have some interlaced (DV@50i) footage that I would like to slow down to half its original playback rate.
My project settings are set to match the DV source media except for the frame-rate which I changed to 50p. The source footage renders fine when played at original speed with smart resample in project, where fields interchange well to form smooth output.
(refer to: https://eugenia.queru.com/2009/02/09/butter-smooth-slow-motion/)When I tried to slow the footage down to half its original playback speed, smart resample would do frame blending, in turn causing ghosting to occur in the render. Disabling resample would effectively make the footage 25p instead of 50i, therefore there are twice the duplicate frames, both are not what I want.
After Effects’ time stretch effect does exactly what I want – slow down interlaced footage without ghosting, but I want to alter the playback rate over time using the velocity envelope in Vegas and because I find Vegas more suitable to my workflow personally.
I’m intending to do this because I’m trying to experiment with interline twitter and other interlacing artifacts caused by slowing down original footage in case if anyone is wondering. Thanks in advance.
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2 Replies
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Have you tried playing with the various “Deinterlace Methods” in Project Properties?
Last year I was working on a project with 60i source footage that I wanted to slow down by about 20:1 . I recall that I had a ghosting problem similar to what you describe until I tweaked that setting, but I can’t remember what I had chosen. I can’t look now because I am in the middle of a long render and don’t want to open a second instance of Vegas.
Steve
Win7 Pro X64 on Dell T7500, MultiTB SATA, 8GB RAM, nVidia Quadro 2000, Vegas 12, 11, 10, 9 DVDA 6.0 & 5.2(build 135) Sony HDR-CX550V, Panasonic GH3 with LUMIX G X VARIO 12-35mm / F2.8 ASPH, LUMIX G X VARIO 35-100mm / F2.8
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Hi Steve,
I understand what you’re trying to say and that’s what I have already tried, both with resampling set on smart and disabled on the video events, but they didn’t give me the effect that I desired. I think I would have to render the 50i source footage to 50p using interpolation and then disable resample on the interpolated version, then I could slow down and get duplicate frames without ghosting, but the original interlacing artifacts would have been lost.Why I’m doing this is because I’m interested in the limitations of interlaced editing systems of the 1990s, when interlaced video was the standard. Whenever a scene needed to be slowed down, it would introduce interline twitter and other interlacing artifacts, mastering it again in interlaced format would cause this to be even more visible, which is what I’m aiming for my project. People tell me that
So far, time stretching the footage in After Effects achieves what I want, but I do need a bit more experimentation. I appreciate and thank you for helping out with my problem.
Rick
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