# Quality problems with VideoRoom (multistream) plugin

**URL:** <https://janus.discourse.group/t/quality-problems-with-videoroom-multistream-plugin/1737>\
**Category:** General\
**Created:** [November 1, 2025, 8:29am UTC](https://janus.discourse.group/t/quality-problems-with-videoroom-multistream-plugin/1737 "2025-11-01T08:29:40Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bmwebrtc](https://avatars.discourse-cdn.com/v4/letter/b/f14d63/32.png) [@bmwebrtc](https://janus.discourse.group/u/bmwebrtc)\
**Post date:** [November 1, 2025, 8:29am UTC](https://janus.discourse.group/t/quality-problems-with-videoroom-multistream-plugin/1737/1 "2025-11-01T08:29:40Z")

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Hey guys,

I’m running a local Janus WebRTC server inside **Ubuntu WSL2** , and I’ve noticed some major performance and metric differences compared to the official Janus demo server. On my local instance, the `plicount` is around 60, `nackcount` is 0, and `totalPacketSendDelay` is very high (~30k), while on the remote demo server, `plicount` is 0, `nackcount` is around 6, and `totalPacketSendDelay` is very low (~0.8). Also, on the local Janus, the framerate fluctuates a lot, whereas on the remote one it stays stable at 30 fps.

Does anyone know what might be causing these discrepancies between a Janus instance running in WSL2 and the official demo server?

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**Author:** ![bmwebrtc](https://avatars.discourse-cdn.com/v4/letter/b/f14d63/32.png) [@bmwebrtc](https://janus.discourse.group/u/bmwebrtc)\
**Post date:** [November 1, 2025, 9:22am UTC](https://janus.discourse.group/t/quality-problems-with-videoroom-multistream-plugin/1737/2 "2025-11-01T09:22:45Z")

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Also I see this Error log from janus repeatedly : [ERR] [rtcp.c:janus\_rtcp\_transport\_wide\_cc\_feedback:1885] Delta value (41249) too large, reporting it as 32767

webrtc stats:

 ![image](https://global.discourse-cdn.com/free1/uploads/janus/original/1X/d08cc4f779a54b172d9e3c49e5c54676482d503d.png)

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**Author:** ![lorenzo](https://yyz2.discourse-cdn.com/free1/user_avatar/janus.discourse.group/lorenzo/32/425_2.png) [@lorenzo](https://janus.discourse.group/u/lorenzo)\
**Post date:** [November 1, 2025, 1:10pm UTC](https://janus.discourse.group/t/quality-problems-with-videoroom-multistream-plugin/1737/3 "2025-11-01T13:10:13Z")

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Your Janus instance may simply be struggling to keep up, or be misconfigured. Profiling with tools like gprof or something similar may help you identify where the code is too busy. Also try playing with settings like `event_loops` (core) or helper threads (VideoRoom).

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<div class="post-metadata">

**Author:** ![bmwebrtc](https://avatars.discourse-cdn.com/v4/letter/b/f14d63/32.png) [@bmwebrtc](https://janus.discourse.group/u/bmwebrtc)\
**Post date:** [November 2, 2025, 8:33pm UTC](https://janus.discourse.group/t/quality-problems-with-videoroom-multistream-plugin/1737/4 "2025-11-02T20:33:07Z")

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It seems to be happening only in ubuntu wsl , i installed janus in debian wsl and it worked fine 👍