# Simulcast issues

**URL:** <https://mediasoup.discourse.group/t/simulcast-issues/3518>\
**Category:** mediasoup libraries\
**Created:** [November 3, 2021, 8:42pm UTC](https://mediasoup.discourse.group/t/simulcast-issues/3518 "2021-11-03T20:42:22Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![MatanYemini](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/matanyemini/32/1307_2.png) [@MatanYemini](https://mediasoup.discourse.group/u/MatanYemini)\
**Post date:** [November 3, 2021, 8:42pm UTC](https://mediasoup.discourse.group/t/simulcast-issues/3518/1 "2021-11-03T20:42:22Z")

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Hi!

I am trying to do simulcast with 3 layers, somehow it seems like the 3rd layer is just not working.

I do see the diff between levels 1 and 2, but the 3rd is not fired.

```auto
+ { scaleResolutionDownBy: 3, maxBitrate: 60000, maxFramerate: fps_low, scalabilityMode: "S1T3" },
+ { scaleResolutionDownBy: 2, maxBitrate: 750000, maxFramerate: fps_high, scalabilityMode: "S1T3" },
+ { scaleResolutionDownBy: 1, maxBitrate: 1500000, maxFramerate: fps_high, scalabilityMode: "S1T3" },

```

I do see all 3 layers are being sent. The mimetype is VP8

I would appreciate an example for best practices / example for simulcast with 3 layers 🙂

Thanks!  
-m

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<div class="post-metadata">

**Author:** ![skavish](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/skavish/32/1018_2.png) [@skavish](https://mediasoup.discourse.group/u/skavish)\
**Post date:** [November 4, 2021, 8:52pm UTC](https://mediasoup.discourse.group/t/simulcast-issues/3518/2 "2021-11-04T20:52:06Z")

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It could help: [Temporal layers are ignored](https://mediasoup.discourse.group/t/temporal-layers-are-ignored/2993)

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<div class="post-metadata">

**Author:** ![MatanYemini](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/matanyemini/32/1307_2.png) [@MatanYemini](https://mediasoup.discourse.group/u/MatanYemini)\
**Post date:** [November 4, 2021, 9:08pm UTC](https://mediasoup.discourse.group/t/simulcast-issues/3518/3 "2021-11-04T21:08:33Z")

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Thanks for the referral – but in my case, 3 are not working… ☹

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<div class="post-metadata">

**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\
**Post date:** [November 4, 2021, 9:19pm UTC](https://mediasoup.discourse.group/t/simulcast-issues/3518/4 "2021-11-04T21:19:25Z")

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mediasoup is not responsible of how many spatial or temporal layers the browser sends. That’s up to the browser based on codec capabilities, CPU usage and network conditions.