# video freezing and frame-rate drops with high package loss

**URL:** <https://mediasoup.discourse.group/t/video-freezing-and-frame-rate-drops-with-high-package-loss/1164>\
**Category:** mediasoup-demo\
**Created:** [June 2, 2020, 7:22am UTC](https://mediasoup.discourse.group/t/video-freezing-and-frame-rate-drops-with-high-package-loss/1164 "2020-06-02T07:22:50Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**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:** [June 2, 2020, 10:04am UTC](https://mediasoup.discourse.group/t/video-freezing-and-frame-rate-drops-with-high-package-loss/1164/4 "2020-06-02T10:04:15Z")

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> [@MichaelShu3333](#):
>
> FEC(Forward Error Correction) as packet loss transport handle

As I said mediasoup does NOT support FEC for video codecs.

> [@MichaelShu3333](#):
>
> I find useinbandfec in code, does useinbandfec : 1 means using FEC mechanism？

Can you point to the corresponding documentation in mediasoup API?

> [@MichaelShu3333](#):
>
> and why I use NACK rtcp feedback, video stream is blur?

Because, as I said, Chrome will limit the bitrate/resolution/frame-rate of its sending video stream based on network uplink quality.

You should also describe whether you are testing this in localhost or in a real server, and whether you are consuming the video in a browser running in the **same** or different computer in which you are applying such a 20% uplink packet loss.

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