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<blockquote data-quote="tourettes" data-source="post: 508509" data-attributes="member: 10858">Ah, now I finally see why only the 24 fps has been plagued with the bad scheduler code. Could you check with PowerStrip what is the exact refresh rate of your 24Hz mode? If it is not 24.000Hz then we have already some drifting (and if audio HW is also something else than 100% exact in its timing the effect is same).This is the are I have been working already, so I think we should combine our effort so we don't do duplicate work. On my dev PC I have 75.025Hz video clock (so it is not possible to playback PAL material without stuttering caused by &quot;random&quot; duplicate frames) but with the improvements I have been working on (based on some other open source code) it is possible to play without stuttering.Actually we don't need to implement own syncing to cure the tearing (as there won't be any when using AERO + DirectX. Those both are handling the v-sync correctly).Could be, or Windows 7 has less buggy / CPU hogging drivers on your HW. As badly behaving drivers are usually the cause for non-stabile timers on Windows (bad driver can block code execution for 10 ms easialy, or for seconds of there is some bug <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />)</blockquote>

[QUOTE="tourettes, post: 508509, member: 10858"] Ah, now I finally see why only the 24 fps has been plagued with the bad scheduler code. Could you check with PowerStrip what is the exact refresh rate of your 24Hz mode? If it is not 24.000Hz then we have already some drifting (and if audio HW is also something else than 100% exact in its timing the effect is same). This is the are I have been working already, so I think we should combine our effort so we don't do duplicate work. On my dev PC I have 75.025Hz video clock (so it is not possible to playback PAL material without stuttering caused by "random" duplicate frames) but with the improvements I have been working on (based on some other open source code) it is possible to play without stuttering. Actually we don't need to implement own syncing to cure the tearing (as there won't be any when using AERO + DirectX. Those both are handling the v-sync correctly). Could be, or Windows 7 has less buggy / CPU hogging drivers on your HW. As badly behaving drivers are usually the cause for non-stabile timers on Windows (bad driver can block code execution for 10 ms easialy, or for seconds of there is some bug :)) [/QUOTE]

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