to get less errors from demos, be sure to quit between recording demos. start ns, record demo, at end stop recording, and type quit in console. if u continue to record the demos after another without quitting, they wont be as clean as the first.
if u want stuff away like text, try hud_draw 0, or hud_saytext 0
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if u want stuff away like text, try hud_draw 0, or hud_saytext 0