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I think I have a similar or related issue, but on another hardware. My XPS 13 with i7-8550U CPU and Intel UHD Graphics 620 (Kabylake GT2) has the following drivers installed on Leap 15:<br>
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<font face="Courier New, Courier, monospace">intel-vaapi-driver | Intel Driver for Video Acceleration (VA) API-><br>
libvulkan_intel | Mesa vulkan driver for Intel GPU<br>
xf86-video-intel | Intel video driver for the Xorg X server</font><br>
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On this platform I can load and play UHD_H265 video (recorded on a Pixel3 phone) both with the Totem and the Dragon players.<br>
Cinx won't load or playback this video, so therefore I thought Cinelerra didn't use hardware acclelerated video GPU, maybe I'm wrong?<br>
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In comparision on another Skylake i7/Nvidia machine, none of these video players or VLC is able to playback this video.<br>
As mentioned by Phyllis/GG it appears that this UHD video file is single-threaded. A workaround is to preprocess the file first with ffmeg before loading it in Cinelerra.
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Terje J. H<br>
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<div class="moz-cite-prefix">Den 06.02.2019 10:56, skrev Andrea paz:<br>
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<pre class="moz-quote-pre" wrap="">A question: playback in CinGG (in X11-OpenGL or X11) use GPU or only CPU?:</pre>
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<blockquote type="cite" cite="mid:CANnPPRp4qAUgphnueGXWdA4E969gxNFm=RTP9cKAX5kSEL6paw@mail.gmail.com">
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Il giorno mer 6 feb 2019 alle ore 10:53 Andrea paz
<a class="moz-txt-link-rfc2396E" href="mailto:gamberucci.andrea@gmail.com" moz-do-not-send="true"><gamberucci.andrea@gmail.com></a> ha scritto:
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<pre class="moz-quote-pre" wrap="">Use 1080p and 30fps smartphone movies, or capture video (vokoscreen)
under the same conditions. Using the video driver as X11 (use direct
X11 render if possible) slightly improves the situation compared to
X11-openGL. But the real difference is that it disables "Play every
frame" (as Pierre has also noticed). All other settings in the
"Playback A*" tab have no effect at all. However, the situation gets
worse and worse, now slows down even without transitions or effects,
just go from one edit to the next to get a block and then resume
normally. In the meantime I made a backup of my system, because I see
it ugly for the future.
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