Thank you very much @Hudson555x
Why I resized ?
Because earlier the resolutions were 820x312. But I need a video with resolution 1280x720, on exporting a video with 1280x720 px resolution i was getting black bars on all the four sides. So i resized my video to fill up the full screen of new project with custom resolution of 1280x720.
Yes, I agree with you, there are several presets available, I tried almost all of them and the exported video contains black bars on all the four sides.
Screenshot of my project properties in Shotcut -
Yes, my video mode is 1280x720 and source video is also of same resolution. And I am not changing anything in advanced settings while exporting the video.
You are absolutely right, it is the issue of media players, I tried to upload the video to youtube and checked there, it is as per my expectations without any black bars.
Here is the Link - https://www.youtube.com/watch?v=U-0Vc2iSdmc&ab_channel=SumitSharma
Thanks you very very much again @Hudson555x