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Fix bug show black video on Safari when using kurento-utils.js

I’m developing a video call system using Kurento as Media Server. The latest Kurento version said that they already support Safari but it did not work in my case 🙁

After a day searching, I found a reason and solution:

Safari does not support generateOffer with offerToReceiveAudio: true

To fix it, you have to extend WebRtcPeer.js to modify some line of codes in generateOffer method or hard code. Go to generateOffer method and use this block code:

Please note that this issue occurred only on Safari, Chrome & Firefox works well so we need to check the block code above only run when browser is Safari.

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