Preview Video Stutters - is jumpy

Natan-Katzman wrote on 5/17/2025, 9:06 PM

With Vegas Pro 21.0. the video preview play stutters badly when played, jumping across many frames when I use MP4 files from our best camera. (It also jums this way when played on VLC Media Player.) When examined frame by frame on Vegas 21.0, each successive frame changes in the normal way.

The audio plays fine. When I render the original video, the new MP4 video plays properly on the media player and works fine in Vegas 21.0. But it is almost impossible to edit the original video because it is so jumpy..

Specs for this camera are XAVC S 4K 24p 100mbps 4:2:2 10 bit. I have no problem with MP4 from our other camera at XAVC S 4K 24p 100mbps 4:2:0 8bit

The problem occurs for both 24 frames per second and 30 frames per second. My hardware is a PC using Windows 10 with 16GB of RAM and an NVIDIA GeForce GT 1030 video card

I’d appreciate any insights or suggestions. Thanks, Nat

Comments

AAProds wrote on 5/17/2025, 9:09 PM

@Natan-Katzman

You'll need to ask this on the Vegas forum here:

https://www.vegascreativesoftware.info/us/

 

Last changed by AAProds on 5/17/2025, 9:09 PM, changed a total of 1 times.

All my forum comments are based on or refer to my System 1.

My struggle is over! I built my (now) system 2 in 2011 when DV was king and MPEG 2 was just coming onto the scene and I needed a more powerful system to cope. Since then we've advanced to MP4 and to bigger and bigger resolutions. I was really suffering, not so much in editing (with proxies) but in encoding, which just took ages. A video, with Neat Video noise reduction applied, would encode at 12% of film speed. My new system 1 does the same job at 160% of film speed. Marvellous. I'm keeping my old system as a capture station for analogue video tapes and DV.

System 1

Windows 11 v23H2 severely modified by Openshell and ExplorerPatcher

Power supply: 850W Cooler Master (should have got modular)

CPU: Intel i7 13700K running at 3400mhz, cooled by a Kraken 2x140mm All In One liquid cooler.

RAM: 64gb (2x32gb sticks) G.Skill "Ripjaws" DDR4 3200Mhz

GPU 1: iGPU UHD 770

GPU 2: NVidia RTX 3060Ti Windforce 8gb

C drive: NVME 500gb

Bluray Burner: Pioneer BDR-212D

Various other SSD and HDDs.

Monitor: 27"/68cm Samsung, 2560 x 1440, 43 pixels/cm.

MEP 2021 version 20.0.1.80

Movie Studio 2025

Magix Video Easy version 7.0.1.145

System 2

(Still in use for TV and videotape capture)

Windows 10 Home Version 2009

CPU: i5-750 at 2670mhz with 12gb RAM

Onboard IEEE1394 (Firewire) port

GPU: ATI Radeon HD 4770 (512mb) which is ignored by MEP

Hard drives: C Drive 256gb SSD, various other HDDs.

Monitor: Dell 22"/56cm, 1680x1050, 35 pixels/cm

Movie Studio 2023

Movie Studio 2024

VPX 12

ericlnz wrote on 5/17/2025, 9:13 PM

@Natan-Katzman You haven't popped up on the Vegas forum yet but when you do the answer is simple - 16gb system ram is inadequate for your best camera's material.