查看nvidia硬件加速编解码器：
ffmpeg -codecs | grep cuvid
信息如下：
DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_cuvid ) (encoders: h264_nvenc h264_vaapi nvenc nvenc_h264 )
DEV.L. hevc H.265 / HEVC (High Efficiency Video Coding) (decoders: hevc hevc_cuvid ) (encoders: nvenc_hevc hevc_nvenc hevc_vaapi )
ffmpeg -codecs | grep nvenc
信息如下：
DEV.LS h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (decoders: h264 h264_cuvid ) (encoders: h264_nvenc h264_vaapi nvenc nvenc_h264 )
DEV.L. hevc H.265 / HEVC (High Efficiency Video Coding) (decoders: hevc hevc_cuvid ) (encoders: nvenc_hevc hevc_nvenc hevc_vaapi )
DEVIL. mjpeg Motion JPEG (decoders: mjpeg mjpeg_cuvid ) (encoders: mjpeg mjpeg_vaapi )
DEV.L. mpeg1video MPEG-1 video (decoders: mpeg1video mpeg1_cuvid )
DEV.L. mpeg2video MPEG-2 video (decoders: mpeg2video mpegvideo mpeg2_cuvid )
DEV.L. mpeg4 MPEG-4 part 2 (decoders: mpeg4 mpeg4_cuvid )
D.V.L. vc1 SMPTE VC-1 (decoders: vc1 vc1_cuvid )
D.V.L. vp8 On2 VP8 (decoders: vp8 vp8_cuvid )
D.V.L. vp9 Google VP9 (decoders: vp9 vp9_cuvid )