# Demo jumpy frames when jumping (any source game) **URL:** \ **Category:** Half-Life 2\ **Created:** [October 25, 2019, 12:25am UTC](https://forums.sourceruns.org/t/demo-jumpy-frames-when-jumping-any-source-game/3493 "2019-10-25T00:25:19Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Grogir](https://b-cdn.sourceruns.org/letter_avatar_proxy/v4/letter/g/0ea827/32.png) [@Grogir](https://forums.sourceruns.org/u/Grogir)\ **Post date:** [October 25, 2019, 12:25am UTC](https://forums.sourceruns.org/t/demo-jumpy-frames-when-jumping-any-source-game/3493/1 "2019-10-25T00:25:20Z")
When playing a recorded demo on half life 2 (last update) or any solo mod, every time the character jumps there is a huge camera movement bug/jump which is really painful to watch. However on every speedruns I’ve watched I’ve never seen this problem, everything is perfectly smooth. How do you guys do? Or is this bug new? Couldn’t find any info on this. ---
**Author:** ![Cameron\_D](https://b-cdn.sourceruns.org/user_avatar/forums.sourceruns.org/cameron_d/32/251_2.png) [@Cameron\_D](https://forums.sourceruns.org/u/Cameron_D)\ **Post date:** [October 26, 2019, 1:27am UTC](https://forums.sourceruns.org/t/demo-jumpy-frames-when-jumping-any-source-game/3493/2 "2019-10-26T01:27:01Z")
That’s got to do with the interpolation. Maybe try the values here and see if it makes a difference. I know it does depend on the engine version so YMMV. > [@Fixing Bunnyhop Jittering](https://forums.sourceruns.org/t/fixing-bunnyhop-jittering/1646): > > Hey. I know that usually in demos for episode one, the bunnyhopping will cause the demo to be jittery as hell. In the HL2 run, everyone could just lower cl\_interp so it looked okay. However, in EP1, cl\_interp is fixed and you can’t change it. However, cl\_interp is calculated by cl\_interp\_ratio / cl\_updaterate, both of which CAN be changed. By using the minimum value of interp ratio and maximum value of update rate, you can lower the interp dramatically. The minimum value of cl\_interp\_ratio is …