If you have Lync 2013 or Skype for business 2015 deployment and you allow HD video in the meeting, while saving the meeting recording, it is possible that the quality in recording may not be good as it was in the meeting.
To save Lync\SFB recordings with high resolution, you need to modify registry on the computer.
Navigate to any of the below location, as per the client version:
For Skype for Business 2016 clients: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Lync\Recording For Lync 2013 / Skype for Business 2015 clients HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Lync\Recording
Look for “VideoFrameRate” attribute and change the value to 30.
You may republish recording that were published before you modified the registry key.