On Wed, 20 Jan 2016 09:59:12 +0000 Andy Furniss <adf.li...@gmail.com> wrote:
> wm4 wrote: > > On Wed, 20 Jan 2016 00:42:18 +0000 Andy Furniss <adf.li...@gmail.com> > > wrote: > > > >> Hendrik Leppkes wrote: > >> > >>>>> I do not agree that it should be a warning. As outlined in > >>>>> the commit message and this thread, there are serious flaws > >>>>> with frame threading and hwaccel. > >>>> > >>>> I'm fine with it being an error, but since it is an API change, > >>>> it should follow the usual deprecation period to allow > >>>> downstream users time to fix it. Meanwhile it can be a warning > >>>> so that people notice the problem. > >>> > >>> Its fundamentally broken, and making it a warning would > >>> re-introduce known crashes. So no. > >> > >> So are the flaws in ffmpeg or particular drivers? > >> > >> It does seem a shame perf wise, I've been testing my AMD UVD > >> decode recently and for 500 UHD frames in a really high bitrate > >> h264 file it's like - > >> > >> ffmpeg threaded = 16 sec. > >> > >> ffmpeg single thread = 20 sec. > > > > With or without hwaccel? > > Both are with hwaccel. ffmpeg 2.8.4 cli > > Admittedly a very concocted benchmark with a very high bitrate sample. > > I know on normal x264 stuff my CPU could beat GPU anyway as the copy > back seems to hurt quite a lot/UVD is for playing. > > For future GPUs that will do hevc I guess it could be more relevant. > > >> gstreamer vaapi 14 sec. > >> > >> gstreamer omx 10 sec. > >> > >> the omx is a faster as the others do nv12 -> I420 on cpu (AFAICT) > >> > >> Maybe -threads 1 hurts perf by limiting the format conversion as > >> well? > >> > >> Is there a way to get whatever the h/w spits out (nv12) directly? > >> Trying to ask for nv12 seemed to get a double conversion. > > > > Both vdpau and vaapi can retrieve image data as nv12. > > With ffmpeg cli? ffmpeg cli doesn't support vaapi. With what hardware was this? What were the command lines you used? _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
