[Freeswitch-users] More pixelated video canvas on larger number of users

Thu Oct 13 07:44:40 MSD 2016

Tony,

rtp_video_max_bandwidth_out was the one I was missing, thank you so much! I
had set video-codec-bandwidth in the conference config, but totally forgot
about that global setting. Once I upped it to match the conference setting,
quality issues disappeared :)

I ended up using 4mb for both settings, would love a double check on my
reasoning to see if that’s the optimal value:

I figure a 640x480 video at 30FPS uses about 1.5mbps

My canvas is 1080x720, so:

640x480 = 307200 pixels
1080x720 = 777600 pixels

777600 pixels / 307200 pixels = 2.53 times as many pixels
1.5mbps x 2.53 = 3.8mbps, 4mbps fer good measure :)

Sound right, or did I miss something?

On Wed, Oct 12, 2016 at 11:12 AM, Anthony Minessale <
anthony.minessale at gmail.com> wrote:

> open another window/tab to chrome://webrtc-internals and look at all of
> the stats.
>
> Have you made sure you are not just maxing our your local bandwidth in
> either direction?
> Did you modify the rtp_video_max_bandwidth_in and rtp_video_max_bandwidth_out
> vars in vars.xml  it defaults to 1m
>
>
> On Wed, Oct 12, 2016 at 12:29 PM, Chad Phillips <chad at apartmentlines.com>
> wrote:
>
>> Here’s another example, perhaps this illustrates it better:
>> https://youtu.be/PqIjubx4-wI
>>
>> And it doesn’t seem to be the entire canvas at once, it’s more of a
>> ‘washing over’. I can definitely see it also affecting the banners in this
>> second example.
>>
>> I’m also happy to drop you into a live example, it’s pretty easy to see
>> what I’m talking about when you’re in the conference.
>>
>> On Wed, Oct 12, 2016 at 9:44 AM, Michael Jerris <mike at jerris.com> wrote:
>>
>>> It does not seem to be the entire canvas to me.  Look at the text labels
>>> on the layers… they don’t seem bad at all.
>>>
>>> On Oct 12, 2016, at 12:37 PM, Chad Phillips <chad at apartmentlines.com>
>>> wrote:
>>>
>>> Mike, it’s the same if I remove video-codec-bandwidth and video-quality.
>>> This short video illustrates the issue: https://youtu.be/l8gpHhgmWRI
>>>
>>> Notice how with just my feed the quality is much better than with the
>>> multiple feeds. The pixelation effect seems to periodically ‘wash over’ the
>>> entire canvas. I’ve had many users report this same issue, even if they
>>> have excellent internet bandwidth.
>>>
>>> Gonzalo, I’ve got a quite beefy physical server, Xeon 32 core, 32GB RAM,
>>> and a nice fat network pipe. I haven’t ever pulled stats on packets in/out.
>>>
>>> On Wed, Oct 12, 2016 at 8:48 AM, Michael Jerris <mike at jerris.com> wrote:
>>>
>>>> is it the same if you remove the following:
>>>>
>>>>       <param name="video-codec-bandwidth" value="1mb"/>
>>>>
>>>>       <param name="video-quality" value="1"/>
>>>>
>>>>
>>>>
>>>> ?
>>>>
>>>> On Oct 12, 2016, at 11:37 AM, Chad Phillips <chad at apartmentlines.com>
>>>> wrote:
>>>>
>>>> Ok, I tested in Firefox, same pixelation issue. One or two video feeds
>>>> looks good, then it degrades as more feeds are added.
>>>>
>>>> Here are the relevant params from my conference config:
>>>>
>>>>       <param name="video-canvas-size" value="1080x720"/>
>>>>       <param name="video-codec-bandwidth" value="1mb"/>
>>>>       <param name="video-auto-floor-msec" value="800"/>
>>>>       <param name="video-kps-debounce" value="30000"/>
>>>>       <param name="video-fps" value="30"/>
>>>>       <param name="video-quality" value="1"/>
>>>>
>>>> On Mon, Oct 10, 2016 at 1:29 PM, Ítalo Rossi <italo at freeswitch.org>
>>>> wrote:
>>>>
>>>>> In which browser?
>>>>>
>>>>> On Mon, Oct 10, 2016 at 1:51 PM, Chad Phillips <
>>>>> chad at apartmentlines.com> wrote:
>>>>>
>>>>>> Running Verto/mod_conference videoconference on 1.6.11, I’ve noticed
>>>>>> that the entire canvas resolution seems more pixelated when the number of
>>>>>> users connected to the videoconference goes up.
>>>>>>
>>>>>> If just one person is connected, the image is very consistent and
>>>>>> clear, but getting into the 7-10 person range, the quality drops
>>>>>> noticeably. And I’m not talking about the quality of one particular video
>>>>>> on the canvas, but the entire canvas quality.
>>>>>>
>>>>>> I’ve done a recording of a videoconference on the server with a
>>>>>> larger number of users, and the video quality there is clear and
>>>>>> consistent, so it doesn’t seem to be an issue with either receiving or
>>>>>> muxing the feeds, but in how the end user is receiving the muxed video.
>>>>>>
>>>>>> I tried playing with the the ‘video-quality’ and
>>>>>> ‘video-codec-bandwidth’ conference params — increasing the video-quality
>>>>>> from 1 to 3 didn’t seem to have much of an impact, increasing the
>>>>>> video-codec-bandwidth from 1mb to 2mb used quite a bit more CPU, but didn’t
>>>>>> seem to positively impact the video quality, either.
>>>>>>
>>>>>> Curious if I’m missing something in the config, or if there’s
>>>>>> something else I can do to improve the video quality with a larger number
>>>>>> of users.
>>>>>>
>>>>>> Chad
>>>>>>
>>>>>
>>>>
>>>
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>>
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>
>
>
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