I'm using ffmpeg executable for transcoding mpegts stream from h264 to h265 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 nvenc in ffmpeg to choose to encode with any of these GPU which I want?
Gyan
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 #.
来源：https://stackoverflow.com/questions/40424350/how-to-specify-the-gpu-to-be-used-by-nvenc-in-ffmpeg