I have omxplayer displaying a video stream from an Axis H.264 network camera. The video looks soft on omxplayer as well as VLC.
However on VLC, I found a control under Tools / Effects & Filters / Video Effects / Essential.
It is the Sharpen control labeled Sigma. By slightly moving the control from the left side stop, my video quality greatly improves.
Is there a "hidden" command line control in omxplayer that does the same thing?