Why is the sound of video music recorded by Sony camera line input low?

The reason is usually an external microphone or a connecting cable. For the microphone sound of the second recording and broadcasting software is low, you can directly find the sound function in the recording and broadcasting software, select the recording tab, select the microphone, open the microphone properties, select the level tab, and adjust the sound of Mike Feng to a higher level, and the problem can be solved.