This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

WebRTC firefox[47.0.1] client lowers the bitrate to very low values sometimes till 0.02 Mbps.

  • 2 பதிலளிப்புகள்
  • 1 இந்த பிரச்சனை உள்ளது
  • 4 views
  • Last reply by Standard8

mzak
mzak
more options

Hello,

Outgoing H.264 call from webRTC Firefox client version 47.0.1. We use the H.264 codec with packetization-mode=0 version.

We observe strange behavior of the Firefox browser - it lowers the bitrate of 

the outgoing call to very low values of the bitrate sometimes till 0.02 Mbps.

We do not observe packet loss, so it could not be the reason to lower the bitrate.

The video section [excluding ICE/TURN/STUN/SRTP stuff] of our SDP is below:

m=video 60020 RTP/AVP 108 c=IN IP4 31.168.3.180 b=TIAS:1200000 a=rtpmap:108 H264/90000 a=fmtp:108 profile-level-id=42801f; max-fs=3600; packetization-mode=0 a=content:main a=label:1 a=rtcp-fb:* ccm fir a=rtcp-fb:* nack pli a=sendrecv

We cannot explain the reason why firefox client lowers the bitrate. The issue does not happen with chrome 52 beta- supporting H.264. Do you have any suggestion what could be the reason of the lowering bit-rate?

Thanks in advance Michael

Hello, Outgoing H.264 call from webRTC Firefox client version 47.0.1. We use the H.264 codec with packetization-mode=0 version. We observe strange behavior of the Firefox browser - it lowers the bitrate of the outgoing call to very low values of the bitrate sometimes till 0.02 Mbps. We do not observe packet loss, so it could not be the reason to lower the bitrate. The video section [excluding ICE/TURN/STUN/SRTP stuff] of our SDP is below: m=video 60020 RTP/AVP 108 c=IN IP4 31.168.3.180 b=TIAS:1200000 a=rtpmap:108 H264/90000 a=fmtp:108 profile-level-id=42801f; max-fs=3600; packetization-mode=0 a=content:main a=label:1 a=rtcp-fb:* ccm fir a=rtcp-fb:* nack pli a=sendrecv We cannot explain the reason why firefox client lowers the bitrate. The issue does not happen with chrome 52 beta- supporting H.264. Do you have any suggestion what could be the reason of the lowering bit-rate? Thanks in advance Michael

mzak மூலமாக திருத்தப்பட்டது

All Replies (2)

mzak
mzak கேள்வியின் உரிமையாளர்
more options

Hi,

We checked: when we work with packetization-mode=1 - everything works perfect. Apparently the problem exists only in single NALU mode, I recommend not to use packetization-mode=0 at all in SDP - if it does not work good.

Best Regards Michael

Standard8
Standard8
more options

Hi, I would suggest posting this to the dev.media mailing list:

https://lists.mozilla.org/listinfo/dev-media

That's where most of our WebRTC experts hang out and should be able to provide you with a good response.