Stable current bitrate and video resolution

General
1

Dear friends，I expected a higher video resolution for video calls, so I simply and crudely modified the resolution rule code in janus.js, expecting to always get 1080p.

However, I find that the Current Bitrate is always changing, rising and falling, and will not stabilize at a specific level. It seems that we used dynamic frame rate adjustment strategy, dynamic resolution adjustment strategy. Is there any way to stabilize the current bitrate at a higher level and maintain the video resolution at a relatively fixed 1080p.
I’m sure my network bandwidth is adequate because this is a test in an Intranet environment.

code
code1107×857 99.1 KB

vc1
vc11656×799 100 KB

vc2
vc21714×791 58.1 KB

vc3
vc31767×966 137 KB

2
  • Dears, can you point out my problem? :pray:
3

I found our website demo (Janus WebRTC Server (multistream): Video Call Demo), can be stable in 100 kbits/SEC current bitrate, and fixed - 640 x480 resolution.

I wondered why I had such a wild fluctuation when I deployed it on my server. Also I expect a high level of current bitrate and HD video. I’m eager to know what the problem is and where to start.

janus
janus1875×885 113 KB

4

You may want to do some iperf UDP tests to/from the server, to see if there’s network problems that cause this.

6

Lorenzo，Thank you very much for your reply.
I’ll check the Internet sometime.

7

I installed iperf3 on both the server and client sides. The test results are as follows:

server:

server
server879×540 12.9 KB

client:

client
client822×438 12.1 KB

  • What conclusions can we draw from this information? :grinning:
8

*** Test 10 thread counts in parallel：**

C:\Users\cbp>iperf3.exe -c 192.168.5.31 -P 10
Connecting to host 192.168.5.31, port 5201
[ 4] local 192.168.2.138 port 55195 connected to 192.168.5.31 port 5201
[ 6] local 192.168.2.138 port 55196 connected to 192.168.5.31 port 5201
[ 8] local 192.168.2.138 port 55197 connected to 192.168.5.31 port 5201
[ 10] local 192.168.2.138 port 55198 connected to 192.168.5.31 port 5201
[ 12] local 192.168.2.138 port 55199 connected to 192.168.5.31 port 5201
[ 14] local 192.168.2.138 port 55200 connected to 192.168.5.31 port 5201
[ 16] local 192.168.2.138 port 55201 connected to 192.168.5.31 port 5201
[ 18] local 192.168.2.138 port 55202 connected to 192.168.5.31 port 5201
[ 20] local 192.168.2.138 port 55203 connected to 192.168.5.31 port 5201
[ 22] local 192.168.2.138 port 55204 connected to 192.168.5.31 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.01 sec 441 KBytes 3.58 Mbits/sec
[ 6] 0.00-1.01 sec 441 KBytes 3.58 Mbits/sec
[ 8] 0.00-1.01 sec 441 KBytes 3.58 Mbits/sec
[ 10] 0.00-1.01 sec 441 KBytes 3.58 Mbits/sec
[ 12] 0.00-1.01 sec 378 KBytes 3.07 Mbits/sec
[ 14] 0.00-1.01 sec 378 KBytes 3.07 Mbits/sec
[ 16] 0.00-1.01 sec 441 KBytes 3.58 Mbits/sec
[ 18] 0.00-1.01 sec 378 KBytes 3.07 Mbits/sec
[ 20] 0.00-1.01 sec 441 KBytes 3.58 Mbits/sec
[ 22] 0.00-1.01 sec 441 KBytes 3.58 Mbits/sec
[SUM] 0.00-1.01 sec 4.12 MBytes 34.3 Mbits/sec

[ 4] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 6] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 8] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 10] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 12] 1.01-2.01 sec 315 KBytes 2.57 Mbits/sec
[ 14] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 16] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 18] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 20] 1.01-2.01 sec 378 KBytes 3.09 Mbits/sec
[ 22] 1.01-2.01 sec 315 KBytes 2.57 Mbits/sec
[SUM] 1.01-2.01 sec 3.57 MBytes 29.9 Mbits/sec

[ 4] 2.01-3.00 sec 378 KBytes 3.11 Mbits/sec
[ 6] 2.01-3.00 sec 315 KBytes 2.60 Mbits/sec
[ 8] 2.01-3.00 sec 378 KBytes 3.11 Mbits/sec
[ 10] 2.01-3.00 sec 378 KBytes 3.11 Mbits/sec
[ 12] 2.01-3.00 sec 378 KBytes 3.11 Mbits/sec
[ 14] 2.01-3.00 sec 378 KBytes 3.11 Mbits/sec
[ 16] 2.01-3.00 sec 378 KBytes 3.11 Mbits/sec
[ 18] 2.01-3.00 sec 378 KBytes 3.11 Mbits/sec
[ 20] 2.01-3.00 sec 252 KBytes 2.08 Mbits/sec
[ 22] 2.01-3.00 sec 315 KBytes 2.60 Mbits/sec
[SUM] 2.01-3.00 sec 3.45 MBytes 29.1 Mbits/sec

[ 4] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[ 6] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[ 8] 3.00-4.00 sec 315 KBytes 2.59 Mbits/sec
[ 10] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[ 12] 3.00-4.00 sec 315 KBytes 2.59 Mbits/sec
[ 14] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[ 16] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[ 18] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[ 20] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[ 22] 3.00-4.00 sec 378 KBytes 3.10 Mbits/sec
[SUM] 3.00-4.00 sec 3.57 MBytes 30.0 Mbits/sec

[ 4] 4.00-5.00 sec 378 KBytes 3.10 Mbits/sec
[ 6] 4.00-5.00 sec 441 KBytes 3.61 Mbits/sec
[ 8] 4.00-5.00 sec 441 KBytes 3.61 Mbits/sec
[ 10] 4.00-5.00 sec 378 KBytes 3.10 Mbits/sec
[ 12] 4.00-5.00 sec 378 KBytes 3.10 Mbits/sec
[ 14] 4.00-5.00 sec 378 KBytes 3.10 Mbits/sec
[ 16] 4.00-5.00 sec 378 KBytes 3.10 Mbits/sec
[ 18] 4.00-5.00 sec 378 KBytes 3.10 Mbits/sec
[ 20] 4.00-5.00 sec 504 KBytes 4.13 Mbits/sec
[ 22] 4.00-5.00 sec 441 KBytes 3.61 Mbits/sec
[SUM] 4.00-5.00 sec 4.00 MBytes 33.5 Mbits/sec

[ 4] 5.00-6.01 sec 441 KBytes 3.60 Mbits/sec
[ 6] 5.00-6.01 sec 441 KBytes 3.60 Mbits/sec
[ 8] 5.00-6.01 sec 441 KBytes 3.60 Mbits/sec
[ 10] 5.00-6.01 sec 504 KBytes 4.11 Mbits/sec
[ 12] 5.00-6.01 sec 504 KBytes 4.11 Mbits/sec
[ 14] 5.00-6.01 sec 441 KBytes 3.60 Mbits/sec
[ 16] 5.00-6.01 sec 378 KBytes 3.08 Mbits/sec
[ 18] 5.00-6.01 sec 378 KBytes 3.08 Mbits/sec
[ 20] 5.00-6.01 sec 378 KBytes 3.08 Mbits/sec
[ 22] 5.00-6.01 sec 441 KBytes 3.60 Mbits/sec
[SUM] 5.00-6.01 sec 4.25 MBytes 35.5 Mbits/sec

[ 4] 6.01-7.00 sec 441 KBytes 3.63 Mbits/sec
[ 6] 6.01-7.00 sec 378 KBytes 3.12 Mbits/sec
[ 8] 6.01-7.00 sec 378 KBytes 3.12 Mbits/sec
[ 10] 6.01-7.00 sec 378 KBytes 3.12 Mbits/sec
[ 12] 6.01-7.00 sec 378 KBytes 3.12 Mbits/sec
[ 14] 6.01-7.00 sec 441 KBytes 3.63 Mbits/sec
[ 16] 6.01-7.00 sec 504 KBytes 4.15 Mbits/sec
[ 18] 6.01-7.00 sec 504 KBytes 4.15 Mbits/sec
[ 20] 6.01-7.00 sec 504 KBytes 4.15 Mbits/sec
[ 22] 6.01-7.00 sec 441 KBytes 3.63 Mbits/sec
[SUM] 6.01-7.00 sec 4.25 MBytes 35.8 Mbits/sec

[ 4] 7.00-8.01 sec 441 KBytes 3.57 Mbits/sec
[ 6] 7.00-8.01 sec 504 KBytes 4.08 Mbits/sec
[ 8] 7.00-8.01 sec 504 KBytes 4.08 Mbits/sec
[ 10] 7.00-8.01 sec 378 KBytes 3.06 Mbits/sec
[ 12] 7.00-8.01 sec 441 KBytes 3.57 Mbits/sec
[ 14] 7.00-8.01 sec 315 KBytes 2.55 Mbits/sec
[ 16] 7.00-8.01 sec 378 KBytes 3.06 Mbits/sec
[ 18] 7.00-8.01 sec 378 KBytes 3.06 Mbits/sec
[ 20] 7.00-8.01 sec 378 KBytes 3.06 Mbits/sec
[ 22] 7.00-8.01 sec 378 KBytes 3.06 Mbits/sec
[SUM] 7.00-8.01 sec 4.00 MBytes 33.2 Mbits/sec

[ 4] 8.01-9.01 sec 378 KBytes 3.10 Mbits/sec
[ 6] 8.01-9.01 sec 378 KBytes 3.10 Mbits/sec
[ 8] 8.01-9.01 sec 378 KBytes 3.10 Mbits/sec
[ 10] 8.01-9.01 sec 504 KBytes 4.13 Mbits/sec
[ 12] 8.01-9.01 sec 378 KBytes 3.10 Mbits/sec
[ 14] 8.01-9.01 sec 378 KBytes 3.10 Mbits/sec
[ 16] 8.01-9.01 sec 252 KBytes 2.07 Mbits/sec
[ 18] 8.01-9.01 sec 315 KBytes 2.58 Mbits/sec
[ 20] 8.01-9.01 sec 315 KBytes 2.58 Mbits/sec
[ 22] 8.01-9.01 sec 441 KBytes 3.62 Mbits/sec
[SUM] 8.01-9.01 sec 3.63 MBytes 30.5 Mbits/sec

[ 4] 9.01-10.00 sec 504 KBytes 4.17 Mbits/sec
[ 6] 9.01-10.00 sec 441 KBytes 3.65 Mbits/sec
[ 8] 9.01-10.00 sec 441 KBytes 3.65 Mbits/sec
[ 10] 9.01-10.00 sec 378 KBytes 3.13 Mbits/sec
[ 12] 9.01-10.00 sec 504 KBytes 4.17 Mbits/sec
[ 14] 9.01-10.00 sec 504 KBytes 4.17 Mbits/sec
[ 16] 9.01-10.00 sec 504 KBytes 4.17 Mbits/sec
[ 18] 9.01-10.00 sec 504 KBytes 4.17 Mbits/sec
[ 20] 9.01-10.00 sec 504 KBytes 4.17 Mbits/sec
[ 22] 9.01-10.00 sec 441 KBytes 3.65 Mbits/sec
[SUM] 9.01-10.00 sec 4.61 MBytes 39.1 Mbits/sec

[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 4.06 MBytes 3.41 Mbits/sec sender
[ 4] 0.00-10.00 sec 4.06 MBytes 3.41 Mbits/sec receiver
[ 6] 0.00-10.00 sec 4.00 MBytes 3.35 Mbits/sec sender
[ 6] 0.00-10.00 sec 4.00 MBytes 3.35 Mbits/sec receiver
[ 8] 0.00-10.00 sec 4.00 MBytes 3.35 Mbits/sec sender
[ 8] 0.00-10.00 sec 4.00 MBytes 3.35 Mbits/sec receiver
[ 10] 0.00-10.00 sec 4.00 MBytes 3.35 Mbits/sec sender
[ 10] 0.00-10.00 sec 4.00 MBytes 3.35 Mbits/sec receiver
[ 12] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec sender
[ 12] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec receiver
[ 14] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec sender
[ 14] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec receiver
[ 16] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec sender
[ 16] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec receiver
[ 18] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec sender
[ 18] 0.00-10.00 sec 3.88 MBytes 3.25 Mbits/sec receiver
[ 20] 0.00-10.00 sec 3.94 MBytes 3.30 Mbits/sec sender
[ 20] 0.00-10.00 sec 3.94 MBytes 3.30 Mbits/sec receiver
[ 22] 0.00-10.00 sec 3.94 MBytes 3.30 Mbits/sec sender
[ 22] 0.00-10.00 sec 3.94 MBytes 3.30 Mbits/sec receiver
[SUM] 0.00-10.00 sec 39.4 MBytes 33.1 Mbits/sec sender
[SUM] 0.00-10.00 sec 39.4 MBytes 33.1 Mbits/sec receiver

iperf Done.

9

In single-threaded tests, the bandwidth is fully above 5Mbps, theoretically enough to support a stable 1080p video resolution. When tested with 10 threads concurrently, the bandwidth dropped below 5Mbps. But I don’t know if it’s gonna make a difference. I’m testing it on a local network.