My form is using the replays in maximum definition (that way go very slow in my pc),
Remove blood, numbers and others with:
/ Opt hud 0 ..... the HUD (player names, player scores etc) can be removed
/ Opt blood 0 (Turns off blood, useful in parkour replays)
/ Opt bloodstains 0 (Stops blood from pooling on the floor)
I record the replay with camtasia and later when edit increase the speed and I include the music.