You're welcome anandkamal!

I'm going to tell you how I export in Premiere Pro/Media Encoder, and hopefully it will apply in Resolve as well.
Make sure your timeline is set at the ratio you filmed at. Unless you shot 16:9, and want to export 2:35:1, then change the aspect ratio to 2:35:1 in your timeline, and edit.
In the export window, export as H.264, 4096 x 1742, Scale to Fill (this is for 2:35:1, you need to figure out 4K online for different aspect ratios), your frame ratio, Square Pixels (1.0), Profile High, Level 5.2, Render at Maximum Depth checked, VBR, 2 Pass, Target Bitrate (Mbps) 100, Maximum Bitrate (Mbps) 300, Use Maximum Render Quality checked, Audio Codec AAC, 48000 Hz Sample Rate, Channels Stereo, Audio Quality High, Bitrate (kbps) 320, and Precedence: Sample Rate.
Hope this helps!
- Paul Harwood