Chao this forum only discusses ffmpeg libav related thing not command line ... but you can do a ffmpeg tutorial http://slhck.info/ffmpeg-encoding-course/#/
On Sat, Mar 24, 2018 at 5:00 AM Chao Liu <[email protected]> wrote: > Hi, > I am trying to see how good h264_amf encoder is. I use ffmpeg to encode a > 1080 video on Windows 10 running Ryzen 5 2500U. Two observations: > > - The encoded video quality is pretty poor, much worse than x264 with a > smaller bitrate. > > - I got about 70fps with ~70% GPU usage. I was expecting to get better > numbers though. > As a comparison, on a much slower intel CPU Celeron n3450, using > h264_vaapi to encode the same file, I got 30 fps with less than 20% GPU > usage. > > The command I use is: > ffmpeg -i transcode-test.mkv -pix_fmt nv12 -c:v h264_amf -profile:v > constrained_baseline -rc cqp -qp_i 0 -qp_p 0 -qp_b 0 h264_amf.mkv > > (looks like the qp parameters don't change anything..) > > Did I do sth. wrong? > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user >
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