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.). > > 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. Timothy _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
