Bit rate video
1. When both the encoder and resolution parameters are fixed, the bit rate is the only factor that determines the quality of the video. The higher bit rate, the better the quality of the video.
2. Generally, the bit rate, the encoder, and the resolution are all corresponding relationships. So there is a table that includes the frequently-used encoders at the common resolution, and the most appropriate bit rate. You can understand by directly watching the table below. (The most appropriate meaning is that the video quality is very good and the file is relatively small.)
H265 (HEVC) and VP9 are top-level encoders; H264 (AVC1) is a mid-level encoder; MPEG4, MPEG2, XVID, DIVX and other encoders are low-level encoders. The higher encoder needs higher bit rate.