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ffmpeg: Add an option "qsv_device" to choose proper node for QSV chil…
…d device (vaapi or dxva2) Reason: For some cases, such as 2 or more graphics cards existing, the default command line may fail because ffmpeg does not open the correct device node: ffmpeg -hwaccel qsv -c:v h264_qsv -i test.264 -c:v h264_qsv out.264 Let user choose the proper one by running like below: ffmpeg -hwaccel qsv -qsv_device /dev/dri/renderD128 -c:v h264_qsv \ -i test.264 -c:v h264_qsv out.264 Signed-off-by: ChaoX A Liu <chaox.a.liu@gmail.com> Signed-off-by: Huang, Zhengxu <zhengxu.maxwell@gmail.com> Signed-off-by: Andrew, Zhang <huazh407@gmail.com> Signed-off-by: Mark Thompson <sw@jkqxz.net>
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