Quality - Recorded video in portrait and then roatated to landscape

Hi

I filmed a concert video in landscape, but when I started the reocrding, my phone was in portait, which meant it saved in portrait.

A few questions:

• The video is 4k. If I rotate it in the photos app, will video quality be affected?
• Will my audio and video quality have been affected in the video (regardless of me rotating in in the ohotos app) because of the fact it was recorded in a different orienation.
• Will the audio have been affeced as it was set recording in portrait but recorded in landscape (stereo audio, etc).

Thanks in advance :)