Audio-Video Synch !

Sots Ts

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Apr 13, 2021, 1:13:25 PM4/13/21

to meetecho-janus

We are seeing issues where some video.mjr recordings have video and audio out of synch.

All of these experiences are confirmed to be on wifi connections that may not optimal, so perhaps the poor connection is the culprit.

However, how does Janus manage video vs audio stream peer publishing... is there anything exposed to manage the synching of this if/when such conditions are even detected?

Thanks!

mayank khandelwal

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Apr 14, 2021, 12:29:59 AM4/14/21

to meetecho-janus

We are also facing similar issue. There is an open pull request which seems to be addressing this issue.

Check this for more information-

https://github.com/meetecho/janus-gateway/pull/2573

Alessandro Toppi

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Apr 14, 2021, 7:51:53 AM4/14/21

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Convert the mjr in pcap and analyze the capture. Try to understand where the sync issue comes from.

That PR is useful in particular cases like smartphones messing with RTP timestamps due to application being put in hold.

Take also a look at skew compensation in januspprec.

Sots Ts

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Apr 14, 2021, 8:08:51 AM4/14/21

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Thank you Alessandro and Mayank.

It seems that the causes for the synch issues with mobile resonate with the causes for low quality wifi users.

Is there any idea as to when this PR will be performed?

Thanks.

Alessandro Toppi

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Apr 14, 2021, 10:18:18 AM4/14/21

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We have submitted a review, but still waiting for the reply from the contributor.

Alessandro Toppi

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Apr 16, 2021, 6:10:31 AM4/16/21

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fyi the patch has been merged

mayank khandelwal

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Apr 16, 2021, 3:59:18 PM4/16/21

to Alessandro Toppi, meetecho-janus

Thanks Alessandro for informing.

Seems like an impressive fix. I tried it on one of the recordings and now the recording looks good.

Tremendous improvement in syncing.

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Sots Ts

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Apr 20, 2021, 7:27:57 PM4/20/21

to mayank khandelwal, Alessandro Toppi, meetecho-janus

Thanks Alessandro, what branch would I pull down to deploy this new fix?

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Alessandro Toppi

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Apr 21, 2021, 6:03:44 AM4/21/21

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master

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