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Uncaught TypeError: Cannot read property 'getTracks' of null

getTracks () .forEach((track) => peerConnection.addTrack(track, stream)); peerConnection .setRemoteDescription(description) .then(() ...

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查詢 「getTracks」的人也找了：

  1. getTracks
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  2. Getvideotracks
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  3. MediaStream
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  4. getAudioTracks
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  5. MediaStreamTrack
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  6. MediaStreamTrack getSources
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  7. MediaStream addtrack
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  8. Removetrack
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