nicesink: "max-bitrate" has no effect

Describe your issue

Setting the "max-bitrate" on webrtcbin's nicesink has no effect.

Expected Behavior

Network burst should be small.

Observed Behavior

Network burst are too high. Udpsink works fine.

Setup

Operating System: Ubuntu 20.04
GStreamer Version: main

Steps to reproduce the bug

catch nicesink using "deep-element-added".

static void onDeepElementAdded(GstBin* /*bin*/, GstBin* /*sub_bin*/, GstElement* element, gpointer /*unused*/)
    {

        std::string_view name(GST_OBJECT_NAME(GST_OBJECT(element)));
        if (name.starts_with("nicesink")) {
            g_object_set(element, "max-bitrate", static_cast<uint64_t>(6600000), nullptr);
        }
    }

set "max-bitrate" like: e.g. bitrate+10%

Screenshots if relevant

Edited Oct 15, 2021 by Wojciech Kapsa