0

Over 2 seconds audio draft on Wirecast

First, a list of hardware and software:

  • HP Z8 Workstation with 2 Xeon Gold processors, 64gb memory, running Windows 10 Professional
  • Presonus Studio Live 32SC connected via USB
  • Latest Wirecast version; the latest official release, no beta versions
  • No capture cards; everything comes in via NDI (except, of course, audio, which comes in via USB)
  • 10gb network just for NDI

As you can see, this is no entry-level system. Now, on with the show.

How do you explain this:

at the start of a 10-hour Wirecast session (no streaming, no recording, timestamps generated by Wirecast, resources well under 20%), just producing on Wirecast and sending the output via NDI), audio was well in sync with video.

A couple of hours into the production (say, about 5 hours), audio started to drift badly. At the end of the session, audio was exactly 2.120 seconds behind video. . I know this because that's the number I had to enter in the video delay box in each of our cameras (via NDI). Yes: the audio was way behind network video cameras.

Why do I suspect that Wirecast is the culprit? Let me correct that. How do I know Wirecast is the culprit? Easy to explain.

At the end of the session, with 2.120 seconds of delay entered, I closed Wirecast. Waited a few seconds, reopened the project and...

Voilà! No audio delay. I deleted the added 2.120 seconds delay and audio was back in perfect sync.

This was also submitted as a ticket. I post it here for two reasons:

  • the possibility of this having happened to someone else and already having a solution
  • the possibility this happening to someone else in the future

As a well-known song says: "would someone please explain the reason for this strange behavior?"

Thanks for your attention.

5replies Oldest first
  • Oldest first
  • Newest first
  • Active threads
  • Popular
  • Have you tried using OBS or some other software to see if the audio/video sync issue is unique to Wirecast?

    Like
    • Webneticos
    • Webneticos
    • 9 mths ago
    • Reported - view

    It has been already proven. See the end of my post.

    Like
      • CraigSModerator
      • Telestream Desktop Forum Moderator
      • CraigS
      • 9 mths ago
      • Reported - view

      Webneticos What version of Wirecast?
      Is this only with NDI out?
      Is monitoring in Wirecast in sync?
      How are you testing NDI on the receiving end?

      Like
      • Webneticos
      • Webneticos
      • 9 mths ago
      • Reported - view

      CraigS  2. First time it happens, so we don't know

      3. NO

      4. NDI monitor

      Like
      • CraigSModerator
      • Telestream Desktop Forum Moderator
      • CraigS
      • 9 mths ago
      • Reported - view

      Webneticos We always ask for version numbers because users may say latest and may have missed updates. Users on 14.3 but not 14.3.4 for example. Please always include the specific version number. 

      Webneticos said:
      3. NO

       If Wirecast monitoring shows the issue it is on input. All Wirecast outs will be out of sync.
      Then David's question is valid since quitting and starting Wirecast may resync the same as other programs if it's an input issue.

      If the issue is on input please do a Wirecast ISO recording of the source.
      Also test with Newtek Studio Monitor on the Wirecast computer (not the receiving computer of Wirecast NDI out).

      Like
Like Follow
  • 9 mths agoLast active
  • 5Replies
  • 21Views
  • 3 Following