I wanted to know what the video bitrate is in ffmpeg, the videos look really bad

ffmpeg video bitrate does not work with HEVC and h264 codec with any size makes the video fuzzy can you solve the problem?

ffmpeg -i sissi -c:v hevc -c:a mp3 -b:v 77k -r 25 -s:v 320:240 -b:a 32k -ar 32000 -af volume=12 sissi.mkv