The audio has invalid data. but it can be repaired. move the ラブライブ!サンシャイン!! Aqours COUNTDOWN LoveLive! ~WHITE ISLAND~ Day 1.mkv file into ffmpeg bin folder, which should have ffmpeg.exe file
Open command prompt and run the following 3 commands separately:
ffmpeg -i "ラブライブ!サンシャイン!! Aqours COUNTDOWN LoveLive! ~WHITE ISLAND~ Day 1.mkv" -vn -c:a copy -movflags +faststart audio_wrong.m4a
ffmpeg -i audio_wrong.m4a -c:a copy audio_right.aac
ffmpeg -i input -i audio_right.aac -map 0:0 -map 1:0 -c:v copy -c:a copy output.mp4
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