It has to be software or settings related or drivers since it was working and this is a much more recent and modern card. But the video playback is just a weird thing. Games do not suffer any problems, games are fantastic with this RX580. It was fine before with the 750Ti and nVidia software/drivers. And again, it is HDMI out to an AVR and then to a TV. The audio sync is fine, but the video is just slow FPS it seems, not smooth. But this video playback issue is a real problem as we use this box as a HTPC too, with Kodi, VLC and chrome for streaming video. This GPU is fantastic for our gaming and I like it for that. I have tried turning off "hardware acceleration" in all things, did not solve the issue. I have tried turning off HDCP, did not solve the issue. I have installed K-Lite codecs and tried Shark007 codecs, did not solve the issue. I imagine it may be something with software or settings with respect to the HDMI output to my AVR or something? Now it's just oddly slow at playback of video, specifically. The only thing that changed was the RX580 entered the system and the software. With the RX580 and latest Radeon drivers/software, I have this odd slow video in all my playback software and streaming in web browser. With my previous 750Ti setup, this worked fine, no issues, video was smooth. I output from my box with an HDMI cable to my Yamaha AVR and then again to my TV via HDMI from the AVR. So it's gotta be software/driver related as the cables and output haven't changed. This also happens on websites with Chrome browser, with Amazon, Netflix and Hulu, audio is in sync, but the video seems slow and under 20FPS. The audio is in sync, but the video FPS seems slow, instead of smooth, like it's under 20 FPS or something. AVI HD264 container video files have slow playback. The side effect, however, is that for some reason, video playback in software like VLC and Media Player Classic with local. Maximum settings in all games at 1080p on my TV and its really fun. I went from an nVidia 750Ti to an AMD RX580 8Gb. My HTPC/Gaming box in my living room recently got an upgrade.
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