- First of all be sure that you use the latest version of Skype for Windows, since only the latest versions provide patches and fixes for detected errors.
- Next, be sure that you always use the latest drivers for your sound card, microphone and other sound devices. On the other hand, if sound issues started to occur after you have installed the latest drivers, as a workaround is roll them back.
- If the previous tips do not help you, try to uninstall any software designed to process and handle your computer sounds (like recording and changing your voice, applying sound effects and other).
What to do if the sound issues still present?
- First, you need to make sure that is really a problem with NGC audio codec. To do this, during a call analyze technical information and look for the
Technology=NGCvalue — if it is not present, then your issue is not related to the NGC and you need to find another solution. Otherwise, keep reading.
- If the problem really related to NGC, and you have already tried all the options to fix it, at this moment you have two workarounds:
- Install Skype 18.104.22.168 (safer, but less features)
- Disable NGC (all features, but dangerous)
How to disable NGC?At this moment, there is no official way to disable NGC, but you can do it in the following way:
- Exit Skype
- Open folder:
C:\Program Files (x86)\Skype\Phone
- Rename file
RtmCodecs.dllto something else
- Launch Skype and make an audio call
- Check if issue still exists
What is the “RtmCodecs.dll” file?I may be wrong, but seems this file contains functions that add support for NGC codec (and most likely, for many more other functions). When “RtmCodecs.dll” is missing, Skype uses default audio codec named SILK. I renamed this file and did various tests, and did not notice any problems during audio and video calls, as well as for group calls. That’s why I beg to inform me if on your system something broke down or does not work properly after renaming this library.
Should my interlocutor also disable NGC?No, because NGC is activated only when all call participants supports it. That’s why even in a group call will be used SILK codec if one user has disabled NGC or uses an unsupported OS or old Skype version.
What problems occur most often due to NGC?
- No sound during audio calls, but everything works perfectly for video calls.
- Only the caller’s voice is heard while any computer sounds (including movies, music, and games) are muted.
- Contrary to previous issue, can be heard only the computer sounds, without the interlocutor’s voice.
I would be grateful for any further details and comments about the article, as well as for reviews of what issue do you had and how you solved it (any technical details are welcome).