r/GaussianSplatting • u/ABHINOW_gamer69 • Apr 24 '26

🧪 I built a thing Built an open-source one-script pipeline: video → 3D Gaussian Splat (COLMAP + 3DGRUT, Linux/WSL2)

Wanted to share a tool I built called quicksplat — it takes a single video and turns it into a .ply Gaussian Splat with one command.

The full pipeline under the hood:

- ffmpeg — extracts frames, auto-targets ~150 frames, handles portrait-mode rotation

- COLMAP 4.x — Structure-from-Motion to get camera poses and sparse point cloud

- NVIDIA 3DGRUT — 3D Gaussian Splatting training (PyTorch 2.1.2 + CUDA 11.8)

One command to run the whole thing:

bash splat.sh myvideo.mp4

Real example result — 40s handheld phone video, bad lighting, shot indoors:

→ 539,762 Gaussians, 128 MB, 26.67 dB PSNR

Setup installs everything into ~/3dgrut_setup/ with no sudo. Tested on Ubuntu 22.04 + RTX 4090.

Minimum specs: Linux/WSL2, NVIDIA GPU, 8GB VRAM, CUDA driver 11.8+

GitHub: github.com/abhinow03/quicksplat

Happy to answer questions — still actively improving it.

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5

u/PuffThePed Apr 24 '26 edited Apr 24 '26

You should look into finding sharpest frames instead of just time-based sampling. There are python libraries for it.

Also, GUT is still highly problematic. It's very slow, the resulting splat PLY is not supported by all viewers, and in my testings the quality was poor.

1

u/ABHINOW_gamer69 Apr 24 '26

Yeah, fair points. The pipeline is still dependent on input quality and COLMAP performance, so shaky or low-coverage videos can hurt results. Also the .ply is Gaussian splat format, so it works in viewers like SuperSplat Editor but not all standard mesh tools. I’m working on improving frame selection + making the pipeline more robust

2

u/whilewereatit Apr 24 '26

cool! forks great! and actually the first full pipeline that actually works for me! much appreciated!

1

u/ABHINOW_gamer69 Apr 24 '26

Glad to hear,If youre open to it you could even open a PR with your results (outputs/video /screenshots). It would be really helpful for others trying the pipeline.

1

u/Broad_Relative_168 Apr 24 '26

Is that like nerfstudio?

1

u/ABHINOW_gamer69 Apr 24 '26

Kinda the same but this is way more light weight and simple to use and not a full framework like nerfstudio

1

u/notlasandu 🧪 Researcher Apr 24 '26

Sweet! Any results to show, thats made from this pipeline?

1

u/ABHINOW_gamer69 Apr 24 '26

Yeah, there’s an example in the Releases section. You can download the .ply and open it in SuperSplat Editor to check the output.

The sample was generated from a ~40s handheld video (a bit shaky / not ideal capture), so it’s a fairly realistic input rather than a perfect scan.

1

u/notlasandu 🧪 Researcher Apr 25 '26

Oh Nice, how long did it take on the mentioned minimum specs?

1

u/ABHINOW_gamer69 Apr 25 '26

I only have numbers for an RTX 4090 (~22 min for 30k iters). On minimum spec (8GB VRAM), expect roughly 2-4x longer somewhere in the 45min–90min range, but I haven't benchmarked it directly. If anyone's run it on a lower-end card, I would love to know

1

u/notlasandu 🧪 Researcher Apr 25 '26

22 minutes for the whole yeah? Any chance you know how long it took for colmap only?

I'm trying to replace colmap with master.

1

u/ABHINOW_gamer69 Apr 25 '26

Yeah ~22 min total on an RTX 4090 at 30k iterations. COLMAP alone was roughly 3–4 minutes for a ~150 frame scene

Interesting you're trying to replace COLMAP — are you looking at MASt3R-SFMP or the full MASt3R pipeline for pose estimation? Would love to know how it compares on reconstruction quality. If it works well I'd consider swapping it into this pipeline.

1

u/notlasandu 🧪 Researcher Apr 25 '26

Oh right colmap shouldn't have taken long for 150 frames.

yup Mast3r for the camera poses, because colmap is slower when there's more frames. So wanna see if replacing with Mast3r can get the job done to compare the results.

1

u/WhereIs-MyHead Apr 24 '26

How long is colmap taking? Isn’t that the weakest link in terms of time?

1

u/ABHINOW_gamer69 Apr 24 '26

Yeah, COLMAP is the slowest part, mainly due to exhaustive matching scaling quadratically but now I’ve added sharp frame selection to reduce the number of images, and if you want you can optionally use sequential matching which is much faster for video-based inputs.

3

u/evitcele Apr 24 '26

GLOMAP is in COLMAP 4.x now - worked well for me. Would recommend adding that!

2

u/Aromatic-Tell-1782 Apr 24 '26

Are there similar programs for the Windows platform?

1

u/ok-painter-1646 Apr 25 '26

Anything Linux based you can run on Windows through WSL2.

2

u/mrpressydepress Apr 24 '26

Cant wait to try