On Ati 5670 HD I see that each screen output gets it's own hardware acceleration "thread" for video, so I need to start 2 such videos to pause, one on each screen, if I want to play back on secondary display via software mode.
Starting with Ati 4670 HD, the video to "grab" the hardware acceleration needs to be opened at all times, and also be the foreground video to "get" the acceleration on any resolution change. In my old GeForce 7300 GT and all previous Nvidia cards, I would just start a single video and it would "grab" the hardware acceleration and keep it, even if minimized or on resolution changes. To work around this issue I start a playback of a video, pause it, and start the video I want to play in "software mode". Video played normally through various players, including KMPlayer and MPC-HC, gets played in video hardware mode (or something like that), and I wish it to not be so, instead to be played in software mode for quality reasons.
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