how to specify the GPU to be used by nvenc in ffmp

问题:

I'm using ffmpeg for transcoding with nvenc and i have two nvidia Graphic Cards installed on my motherboard: GeForce GTX 690 and Tesla k-10. is there any codec specific parameters for nvnenc in ffmpeg to encode with any of these GPU which i want?

回答1:

The nvenc encoders have a GPU option which allow both to list and also to select GPUs to be used for encoding.

So, use

ffmpeg -f lavfi -i nullsrc -c:v h264_nvenc -gpu list -f null -

Above, a dummy video source is generated and then piped to null. Meanwhile, FFmpeg will list the list of available GPUs.

Once known, a specific GPU can selected by adding -gpu N to the encoding command where N is the device #.