MP4 videos not rendering

[oseymour]

Describe the bug

I'm trying to view a video using mo.video() and the video is not showing correctly in the marimo editor.

I can't share the video here because work IP things, but here is what I'm seeing in the notebook. There are no issues with the video when I open it in a media viewer. I've tried several other MP4 files and get the same result.

I also can't view the video in the example code from the video docs.

Environment

{
  "marimo": "0.10.13",
  "OS": "Windows",
  "OS Version": "10",
  "Processor": "Intel64 Family 6 Model 94 Stepping 3, GenuineIntel",
  "Python Version": "3.11.2",
  "Binaries": {
    "Browser": "128.0.6613.121",
    "Node": "--"
  },
  "Dependencies": {
    "click": "8.1.8",
    "docutils": "0.21.2",
    "itsdangerous": "2.2.0",
    "jedi": "0.19.2",
    "markdown": "3.7",
    "narwhals": "1.22.0",
    "packaging": "24.2",
    "psutil": "6.1.1",
    "pygments": "2.19.1",
    "pymdown-extensions": "10.14",
    "pyyaml": "6.0.2",
    "ruff": "0.9.2",
    "starlette": "0.45.2",
    "tomlkit": "0.13.2",
    "typing-extensions": "4.12.2",
    "uvicorn": "0.34.0",
    "websockets": "14.1"
  },
  "Optional Dependencies": {}
}

Code to reproduce

import marimo as mo

mo.video(
    src="https://v3.cdnpk.net/videvo_files/video/free/2013-08/large_watermarked/hd0992_preview.mp4",
    controls=False,
)

[mscolnick]

This works fine for me. Could be a windows issue? anything in the network tab or terminal?

mo.video(
    src="https://v3.cdnpk.net/videvo_files/video/free/2013-08/large_watermarked/hd0992_preview.mp4",
)

[oseymour]

@mscolnick There's nothing in the terminal. What is the network tab?

[mscolnick]

It's the browser network tab, under the Developer Tools. E.g. Chrome Developer Tools

[oseymour]

So I tried displaying the video from that URL on another machine and it worked. Something with the network config on the 1st machine I tried this on must have blocked that video.

But I still cannot display a local MP4 file on either machine.

[mscolnick]

Could it be an ad-blocker?

[oseymour]

Oh it certainly could be, I use uBlock. I'm gone on vacation next week and I'm having this issue on my work laptop. I'll check this out when I'm back.