AV Sync Tips

AV Sync issues can be fairly common, especially when it comes to live streaming. Today on Live @ Epiphan, we look at what causes AV Sync problems, how to test, and some tips for ensuring your AV Sync is correct.

SHOW INDEX:
1) 1:24 - News
2) 4:17 - What is AV sync?
3) 7:01 - Early audio
4) 9:08 - Audio path vs video path
5) 9:58 - Video delay directly from cameras
6) 11:51 - Milliseconds vs frames
7) 12:54 - Audio early vs late
8) 14:09 - How to test your AV sync
9) 19:20 - How to correct sync issues
10) 22:00 - Video signal chain latency

LINKS:
1) Epiphan community forum -

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Live @ Epiphan is a weekly live show covering topics related to live streaming, video technology, video production and best practices for content creators.

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Have any of your own tips related to AV Sync? Leave a comment below!

[HuDz]

Can i use a mobile phone to record the test pattern and then load the file into adobe? My Samsung S8 has slow motion video that records at higher frame rate (240fps), would this be better for higher resolution? I am testing av sync as i believe the video of my xbox through my Sony AV receiver is delayed slightly. Cheers.

[wasbeen]

Anyone else see this? Steaming to Facebook Live appears to add more AV sync issues than YouTube. Out of the same equipment. Video mixer, with cameras for pictures plus XLR audio mixer for audio, into ProRes recorder, then out then into Webcaster X2 to either Facebook or YouTube.

[daveedwards]

Great presentation, much appreciated, now you just need to add a custom RTMP option to the the X-2 and you will be golden. Hope to meet you at NAB.

[jeremycurtis]

If you are after measuring the AV error accurately and easily, just use a Sync-One2.

[ricknelsonduke]

what if we used our analog mixer, and fed that signal into the camera XLR ins, instead of a switcher - would that now automatically delay the audio to the same HDMI out delay? Using a single HDMI camera with a mixed audio concert sent to my webmaster X2 here...

[briansanderson]

I use the X2 with JVC HM170U. I run from our mixer to JVC camera's XLR's. The camera seems to take care of sync issues.

[vitamine-z]

the Canon Vixia HF G10 says it does 1080p in the HDMI menu system but in reality it does 1080i !!