# Safari 15 / Firefox not encoding correct VP9 SVC Layers

**URL:** <https://mediasoup.discourse.group/t/safari-15-firefox-not-encoding-correct-vp9-svc-layers/3459>\
**Category:** mediasoup libraries\
**Created:** [October 20, 2021, 8:26pm UTC](https://mediasoup.discourse.group/t/safari-15-firefox-not-encoding-correct-vp9-svc-layers/3459 "2021-10-20T20:26:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Eugene](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/eugene/32/697_2.png) [@Eugene](https://mediasoup.discourse.group/u/Eugene)\
**Post date:** [October 20, 2021, 8:26pm UTC](https://mediasoup.discourse.group/t/safari-15-firefox-not-encoding-correct-vp9-svc-layers/3459/1 "2021-10-20T20:26:30Z")

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Hi All,

Given that Safari is starting to support VP9 by default as of version 15, I started to experiment with SVC a bit.

I am running into some problems there, though. Mainly - it doesn’t actually seem to work as expected on these two browsers. I am using the following encoding as an example - which should produce up to 9 layers (3 spacial 3 temporal).

CAM\_SVC\_ENCODING = [{scalabilityMode: ‘L3T3’, active: true}]

However, when I fetch the producer stats in Safari/FF, it is only producing layer “0.0” at full resolution - EG, as if SVC isn’t active at all. Only chrome seems to behave correctly.

Anyone else run into this / any suggested fixes / work-arounds, or are those 2 browsers “just not ready yet”?

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**Author:** ![nazar-pc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/nazar-pc/32/369_2.png) [@nazar-pc](https://mediasoup.discourse.group/u/nazar-pc)\
**Post date:** [October 20, 2021, 8:31pm UTC](https://mediasoup.discourse.group/t/safari-15-firefox-not-encoding-correct-vp9-svc-layers/3459/2 "2021-10-20T20:31:21Z")

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VP9 SVC in general is a big hack and is Chromium-specific