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https://issues.apache.org/jira/browse/OPENMEETINGS-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16253129#comment-16253129
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Dmitriy Muratov commented on OPENMEETINGS-1737:
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Hello again.

Finally I found, that's the reason of audio jerking. It happens because I tryed 
to connect stereo stream. As soon as I left only 1 audio channel(simply by "-ac 
1" option) it started to play normally. I didn`t imagine that it can be a 
reason but it was so simple.... So there is 2 ways to fix it, connect only mono 
stream or video or changing configuration of ffmpeg.

And question for Maxim. Am I only 1 person, who have this problems with stereo 
stream?
Thanks for your time.  

> Troubles with sound at connecting external video source
> -------------------------------------------------------
>
>                 Key: OPENMEETINGS-1737
>                 URL: https://issues.apache.org/jira/browse/OPENMEETINGS-1737
>             Project: Openmeetings
>          Issue Type: Bug
>          Components: Audio/Video
>         Environment: Centos 7
>            Reporter: Dmitriy Muratov
>            Assignee: Maxim Solodovnik
>              Labels: external, source
>             Fix For: 4.0.1
>
>         Attachments: Video_2017-11-02_155137.wmv, screen.jpg
>
>
> Hello!
> I have some troubles with connecting external video source. In stream in OM 
> room, audio and video are jerking. But if I streaming video  whitout audio 
> stream, it playing normally. And if I show mp4 container without video stream 
> it is jerking again. 
> Changing ffmpeg keys didn't help. Running ffmpeg whithout encoding (-acodec 
> copy) didn't help. No different between file on server or internet stream. 
> VMs config: 4GB memory, 4 processors, everything busy max on 20%. IP traffic 
> not busy. 
> Ping time ~ 0.600 ms.
> It's demo file of sound and video jerking attached
> Have you some idea that's wrong?
> Thanks!



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