Why do you think this is related to signal emission, and not to accessing the QMap ?
Does it crash if you just print the values ?
Qt Code:
  1. // emit newStreamFound(_streams[streamOneSSRC]);
  2. // emit newStreamFound(_streams[streamTwoSSRC]);
  3. qDebug() << _streams[streamOneSSRC];
  4. qDebug() << _streams[streamTwoSSRC];
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