# Simulcast sends only one stream **URL:** \ **Category:** mediasoup libraries\ **Created:** [March 27, 2020, 11:21am UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694 "2020-03-27T11:21:26Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Adrinalin4ik](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/adrinalin4ik/32/474_2.png) [@Adrinalin4ik](https://mediasoup.discourse.group/u/Adrinalin4ik)\ **Post date:** [March 27, 2020, 11:21am UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/1 "2020-03-27T11:21:26Z")
Hi! I am trying to figure out how does simulcast works. My encoding params are { maxBitrate: 40000, scaleResolutionDownBy: 2.2 }, { maxBitrate: 64000, scaleResolutionDownBy: 1.6 }, { maxBitrate: 88000 } and scalabilityMode is S3T3. When I pass a video with width 415 I get only one stream. If I pass width 416 then I get 2 streams. That’s widths too much for me. I’d like to use widths 80, 180 for my purposes and get 3 streams for 3 layers. Could you help me? ---
**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:** [March 27, 2020, 11:51am UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/2 "2020-03-27T11:51:10Z")
Whether the browser honors given simulcast settings or not of up to the browser and to the video encoder. Indeed it depends on input video size and so on. Nothing we can “fix” in mediasoup-client side. > [@Adrinalin4ik](#): > > Could you help me? Yes. Will you also help others in this forum? > [@Community means helping others, not just yourself](https://mediasoup.discourse.group/t/community-means-helping-others-not-just-yourself/632): > > Hi all, Lately, many questions are being asked in this forum, many of them not directly related to mediasoup but to other topics. I guess that most of them may be solved by just reading the extensive [documentation](https://mediasoup.org/documentation/v3/) available in the mediasoup website. Making questions is fine. Just using the forum to make those questions and never reply nor help to others is not that fine. We, mediasoup authors, have limited time and we are not being paid for giving free support. In order to make this forum mor… ---
**Author:** ![Adrinalin4ik](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/adrinalin4ik/32/474_2.png) [@Adrinalin4ik](https://mediasoup.discourse.group/u/Adrinalin4ik)\ **Post date:** [March 27, 2020, 11:55am UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/3 "2020-03-27T11:55:19Z")
Yes, I’ll help others with the same issue if I figure out how to make it. ---
**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:** [March 27, 2020, 12:01pm UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/4 "2020-03-27T12:01:54Z")
To clarify: - You cannot do magic. If you pass a very low resolution video to `transport.produce()` the browser encoder will not generate simulcast streams but just one. You should reconsider your video size. - I don’t mean “help others with same problem”. I mean help others in general. ---
**Author:** ![Adrinalin4ik](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/adrinalin4ik/32/474_2.png) [@Adrinalin4ik](https://mediasoup.discourse.group/u/Adrinalin4ik)\ **Post date:** [March 27, 2020, 1:59pm UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/5 "2020-03-27T13:59:05Z")
No problem, if I know how to solve something I’ll help. ---
**Author:** ![Adrinalin4ik](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/adrinalin4ik/32/474_2.png) [@Adrinalin4ik](https://mediasoup.discourse.group/u/Adrinalin4ik)\ **Post date:** [March 27, 2020, 2:23pm UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/6 "2020-03-27T14:23:14Z")
Could you suggest me where do read more about resolution and browser encoder? ---
**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:** [March 27, 2020, 2:38pm UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/7 "2020-03-27T14:38:09Z")
Honestly no idea. This is libwebrtc internals. No documentation about it but just expertise. ---
**Author:** ![kra](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/kra/32/739_2.png) [@kra](https://mediasoup.discourse.group/u/kra)\ **Post date:** [May 29, 2021, 10:13pm UTC](https://mediasoup.discourse.group/t/simulcast-sends-only-one-stream/694/8 "2021-05-29T22:13:44Z")
Can confirm I see the same thing for a video of the size 360x640 but if I scale up the sending resolution to 720x1280 it sends all the simulcast streams. Thankyou for the response, now that I know the issue I can debug it better from here!