[Libav-user] Quicksync decoding problem when there are 2 video cards

[Richard Lince]

Try setting the Intel display as the primary device.

On 12/06/2023 15:18, Amir Davidov wrote:
> Hi
>
> I have a machine running Windows 10 that has 2 graphics cards in it, 
> an Intel HD Graphics 630 & an NVIDIA GeForce GTX 1060. The CPU 
> supports Quicksync & the monitor is plugged into the Intel Graphics card.
>
> I'm using a variant of Anton Khirnov's 2015 qsvdec.c example.
>
> If I have both graphic cards enabled in Windows then we I get to the line:
>
> av_hwdevice_ctx_create(@FHWDecode.hw_device_ref,AV_HWDEVICE_TYPE_QSV,'auto',nil,0)
>
> I get "Error initializing an MFX session: -3." If I disable the NVIDIA 
> card using the device manager the call is successful & things work 
> properly. To my untrained eye, it would appear like it's trying to 
> open a Quicksync session on the wrong card. Interestingly, when I 
> initialize a Quicksync enabled encoder (eg h264_qsv) it is always 
> quite happy to do that even when the NVIDIA card is enabled.
>
> If I'm right about it trying to open a Quicksync session to the NVIDIA 
> card, is there a way of pointing at the correct videocontroller 
> without having to disable to card? I can identify which 
> videocontroller is the Intel card using WMI.
>
> Best wishes
>
> Fred
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Best Regards,
Richard Lince,
Founder & Managing Director

bluebox.video <https://www.bluebox.video>
+44(0)7841665146

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