On 2016/8/16 11:07, Timothy Gu wrote: > Hi > > On Mon, Aug 15, 2016 at 7:44 PM Jun Zhao <mypopy...@gmail.com> wrote: > >> >> >> On 2016/8/16 10:14, Chao Liu wrote: >>> Sorry for this little diversion: what are the differences between QSV and >>> vaapi? >>> My understanding is that QSV has better performance, while vaapi supports >>> more decoders / encoders. Is that correct? >>> It would be nice if there are some data showing the speed of these HW >>> accelerated decoders / encoders. >> >> QSV has better performance is right, but libyami have more >> decoders/encoders than >> vaapi hw accel decoder/encoder. :) >> > > I am not sure where you got this information. > > On Intel platforms they all use the same chip. Because VAAPI supports more > than just Intel platforms, VAAPI supports all codecs libyami and QSV > support, if not more. > > QSV works on both Windows and Linux, although it is a pain to set up a > Linux QSV environment (you have to have the right distro, right kernel, > etc.). > >
I means ffmpeg_VAAPI hw accel decoder/native VAAPI encoder, not the VAAPI as interface. >> >> According our profile, the speed of QSV/Libyami/vaapi-hw accel decoder and >> native >> vaapi encoder are: QSV > ffmpeg and libyami > vaapi-hw accel decoder and >> native >> vaapi encoder >> > > You didn't mention _how_ you profiled things, and for HW encoding different > ways of profiling can cause wildly different results. If for example you > are not doing zero-copy VAAPI operations, you are inherently giving the > other two methods an edge. > I used the ffmpeg_QSV/ffmpeg_libyami/ffmpeg_vaapi to do zero-copy mode transcode with default setting as profile case. > Timothy > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
