mov file has some empty channels audio tracks in premiere pro

[sa7ar-yehia]

I have a mov file when imported into Premiere shows 16 channels audio tracks only 4 of them have waveforms while the rest is empty. Any explanation for that?

And how can I hide these empty channels automatically without unlinking and deleting them manually.

Here are some screenshots:

 

[Vishu_Aggarwal]

Locate the clip in the project panel and then right-click on the clip modfiy > audio channels and change number of audio clips to 4.

[sa7ar-yehia]

Thanks for your reply. I've tried these steps and it worked but for some reason it also remove the video clip. So now I have 4 audio channels instead of 16 but with no video. How can I keep the video? 

[Steve Griffiths]

The reason this is happening is determined by the 'source' (Camera, digitising or exporting).

If it's from (say) a camera, then it's the way (and number of audio tracks) the camera recorded.

If the footage was digitised (or exported) then the number of audio channels was determined by that process.

[sa7ar-yehia]

Thanks for the explanation.