Firefox DASH DRM decoding fails under frequent seeking

[prestonbarnett]

I've been running into an issue with the video player crashing on Firefox while decoding DRM-enabled DASH segments. This behavior occurs when frequently seeking. The error can also be intermittently reproduced with the built-in seek bar as well. The problem does not occur on Chrome.

When the player fails, the following error is emitted from the player:

Media resource blob:https://www.nuevodevel.com/8e9b21cb-4839-44de-934b-67d21c8b5d27 could not be decoded.

Media resource blob:https://www.nuevodevel.com/8e9b21cb-4839-44de-934b-67d21c8b5d27 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005)
Details: ipc::IPCResult mozilla::gmp::ChromiumCDMParent::RecvIncreaseShmemPoolSize(): Failled to ensure CDM has enough shmems.

Reproduction Steps:

1. Visit DRM Demo: https://www.nuevodevel.com/nuevo/showcase/drm
2. Paste the following into the console after playing the video to reproduce the frequent seeking crash

let video = document.querySelector('video');

if (video) {
  function increaseCurrentTime() {
    if (video.currentTime < video.duration) {
      video.currentTime += 0.1;
    } else {
      clearInterval(interval);
    }
  }

  let interval = setInterval(increaseCurrentTime, 20);
} else {
  console.log('No video element found on this page.');
}

System

Browser: Firefox 128
OS: MacOS 14.5 (23F79)