If you are hearing only in the left ear and right ear is mute, use this command to convert the video to Stereo (Duplicates the left audio into right).
ffmpeg -i "D:\Tutorials\Udemy - Beginning CUDA Programming\1. Let's Learn CUDA Programming!\5. Heterogenous Computing and CUDA.mp4" -filter_complex "[0:a]pan=stereo|c0=c0|c1=c0[a]" -map 0:v -map "[a]" -c:v copy -c:a aac -b:a 192k "D:\Tutorials\Udemy - Beginning CUDA Programming\1. Let's Learn CUDA Programming!\5. Heterogenous Computing and CUDA2.mp4"