Hardware acceleration / vaapi
Vincent Pinon
vpinon at kde.org
Sun Oct 22 11:31:59 UTC 2017
Many thanks for the status Bernd!
Le dimanche 22 octobre 2017, 10:57:12 CEST B.M. a écrit :
> Dear all,
>
> After some weeks I'm reporting back now concerning hardware accelerated
> encoding on my Intel Haswell machine with HD 4600 graphics.
>
> Detailed testing shows that (at least on this little older CPU ( ~ 2013)):
> - hardware encoding with resizing is slower than software
> encoding, so I stay with software encoding for proxy clip
> generation
> - hardware encoding without resizing is faster than software
> encoding, but quality is significantly worse, so I stay with
> software encoding for the final rendering as well
>
> Results are in fact quite disappointing for me - maybe with newer integrated
> Intel graphics that would be different. And my results are in line with what
> is stated on the ffmpeg website: in general their software encoder produces
> better results, takes better advantage of multiple threads and is also much
> easier to control (especially image quality). I found also that ffmpeg
> produces much smaller files for a comparable image quality.
>
> For the record:
> I tested with different clips of 4k video, 20 - 35 seconds each; resizing was
> to 640x368. I tried different presets / qualities and number of threads.
>
> Best regards,
> Bernd
>
>
> On Freitag, 11. August 2017 11:57:29 CEST Vincent PINON wrote:
> > Hello,
> >
> > 'kdenlive_render' accepts the parameter: 'preargs="..."' to pass
> > arguments to melt before any other (profile, consumer etc).
> > you can also run trials with 'melt' command instead of
> > 'kdenlive_render', which is just a wrapper to send progress info &
> > controls to notifications, but is then a bit less flexible.
> > (see source code in "kdenlive.git/render" : kdenlive_render.cpp,
> > renderjob.cpp)
> >
> > Thanks for your investigations, very interesting if we can have it
> > working. Sorry for not being able to help more at the moment (no linux
> > machine nearby & quite in a hurry)...
> >
> > Vincent
> >
> > Le 08/11/2017 10:58 AM, B.M. a écrit :
> > > Well, eventually I'd like to create a new render profile, but in order to
> > > find out how it works (more precisely: why it didn't work), I looked at
> > > the render scripts kdenlive creates; I thought it might be easier to
> > > learn it like that.
> > >
> > > Whatever, it doesn't work as you proposed :-(
> > >
> > > I think without support from the developers I won't make better progress.
> > >
> > > Thank you Evert,
> > > best regards,
> > > Bernd
> > >
> > > On Freitag, 11. August 2017 07:24:57 CEST Evert Vorster wrote:
> > >> Hi there, Bernd.
> > >>
> > >> I am under the impression that you want to create a render profile in
> > >> Kdenlive. If that is the case start with the example from the bug report:
> > >>
> > >> -vaapi_device /dev/dri/renderD128 -hwaccel vaapi
> > >> -hwaccel_output_format vaapi -i -an -c:v dnxhd
> > >>
> > >> If you have a look at all the other rendering profiles, you will
> > >> notice that none have an input our output,
> > >>
> > >> these are added by Kdenlive itself.
> > >>
> > >> Kind regards,
> > >>
> > >> Evert
> > >>
> > >> On 10 August 2017 at 19:47, B.M. <b-misc at gmx.ch> wrote:
> > >>> 1) Proxy clips -- done
> > >>>
> > >>> Proxy clips creation with hardware acceleration is working fine now, for
> > >>> the
> > >>> record:
> > >>> I use x264 with these settings (in ~/.local/share/kdenlive/
> > >>> encodingprofiles.rc):
> > >>>
> > >>> x264_vaapi=-vaapi_device /dev/dri/renderD128 -i -vf
> > >>> format=nv12,hwupload,scale_vaapi=w=1280:h=720 -vcodec h264_vaapi -b:v 5M
> > >>> -ab
> > >>> 128k -acodec libvorbis;mp4
> > >>>
> > >>>
> > >>> 2) Project rendering -- open
> > >>>
> > >>> Still open - Evert, -i instead of $SOURCE_0 and $TARGET_0 cannot work
> > >>> because
> > >>> source and target contain the mlt script and the output file.
> > >>> Does this not work at all? Is it a mlt problem?
> > >>>
> > >>> Thank you so much for further input!
> > >>> Bernd
> > >>>
> > >>> On Donnerstag, 10. August 2017 14:41:38 CEST you wrote:
> > >>>> Hi there, Bernd
> > >>>>
> > >>>> Try again, but replace the "- $SOURCE_0 $TARGET_0" with "-i"
> > >>>>
> > >>>> Kind regards,
> > >>>> -Evert-
> > >>>>
> > >>>> On 10 August 2017 at 13:37, B.M. <b-misc at gmx.ch> wrote:
> > >>>>> PS: I'm trying something like (render script)
> > >>>>>
> > >>>>> PARAMETERS_0="-kuiserver -pid:8839 in=0 out=1139 $MELT uhd_2160p_25
> > >>>>> 'avformat
> > >>>>> vaapi_device=/dev/dri/renderD128' - $SOURCE_0 $TARGET_0
> > >>>>> properties=x264-medium
> > >>>>> f=mp4 vf='format=nv12,hwupload' vcodec=libx264_vaapi acodec=aac g=120
> > >>>>> crf=23
> > >>>>> ab=160k preset=faster threads=1 real_time=-1"
> > >>>>>
> > >>>>> but it doesn't work.
> > >>>>>
> > >>>>> Best,
> > >>>>> Bernd
> > >>>>>
> > >>>>> On Donnerstag, 10. August 2017 14:36:16 CEST you wrote:
> > >>>>>> Hi,
> > >>>>>>
> > >>>>>> Foreword: I just did the upgrade to the testing package (17.04.3) to
> > >>>
> > >>> get
> > >>>
> > >>>>>> this "bug fix".
> > >>>>>>
> > >>>>>> I'm really sorry, but I don't get it:
> > >>>>>>
> > >>>>>> What you've sent me is the rendering parameter, as set in the render
> > >>>>>
> > >>>>> dialog.
> > >>>>>
> > >>>>>> You changed is from vcodec=hevc to vcodec_nvenc to get hardware
> > >>>
> > >>> encoding
> > >>>
> > >>>>>> working with your nvidia card.
> > >>>>>>
> > >>>>>> What I want is just the same, but for vaapi because I've only the
> > >>>>>
> > >>>>> integrated
> > >>>>>
> > >>>>>> intel graphics. I can use libx264_vaapi as like with the ffmpeg
> > >>>
> > >>> command,
> > >>>
> > >>>>>> but there are more parameter required (vaapie_device, hwaccel, ...)
> > >>>>>> -
> > >>>>>> that's what Anton mentions in his bug report, and he asks for both
> > >>>
> > >>> proxy
> > >>>
> > >>>>>> clips and "encoding profile" which I take as rendering profile.
> > >>>>>> JBM's
> > >>>>>> answer and the commit are only talking about proxy clips and
> > >>>>>> transcoding,
> > >>>>>> not about rendering, so this leaves me unsure.
> > >>>>>>
> > >>>>>> From my understanding, I've the same problem as Anton: I need to
> > >>>
> > >>> inject
> > >>>
> > >>>>> the
> > >>>>>
> > >>>>>> additional parameters needed for vaapi (but not for nvenc) for the
> > >>>>>
> > >>>>> rendering
> > >>>>>
> > >>>>>> command, but so far I didn't find out how I have to do this. If I
> > >>>>>
> > >>>>> generate
> > >>>>>
> > >>>>>> a render script, I get something like
> > >>>>>>
> > >>>>>> PARAMETERS_0="-kuiserver -pid:8839 in=0 out=1139 $MELT uhd_2160p_25
> > >>>>>
> > >>>>> avformat
> > >>>>>
> > >>>>>> - $SOURCE_0 $TARGET_0 properties=x264-medium f=mp4 vcodec=libx264
> > >>>>>> acodec=aac g=120 crf=23 ab=160k preset=faster threads=1
> > >>>>>> real_time=-1"
> > >>>>>>
> > >>>>>> Now, where do I have to insert these parameter (beside changing
> > >>>
> > >>> libx264
> > >>>
> > >>>>> to
> > >>>>>
> > >>>>>> libx264_vaapi)?
> > >>>>>>
> > >>>>>> Unfortunately I don't have Anton's e-mail address, so I cannot ask
> > >>>
> > >>> him
> > >>>
> > >>>>>> directly ;-)
> > >>>>>>
> > >>>>>> Best,
> > >>>>>> Bernd
> > >>>>>>
> > >>>>>> On Donnerstag, 10. August 2017 07:54:18 CEST Evert Vorster wrote:
> > >>>>>>> Hi there, Bernd
> > >>>>>>>
> > >>>>>>> Have a look at this bug:
> > >>>>>>> https://bugs.kde.org/show_bug.cgi?id=378832
> > >>>>>>>
> > >>>>>>> With the fixed bug there is also an example on how to make a vaapi
> > >>>>>
> > >>>>> profile
> > >>>>>
> > >>>>>>> from JBM
> > >>>>>>>
> > >>>>>>> Kind regards,
> > >>>>>>> -Evert-
> > >>>>>>>
> > >>>>>>> On 9 August 2017 at 20:55, B.M. <b-misc at gmx.ch> wrote:
> > >>>>>>>> Hi,
> > >>>>>>>>
> > >>>>>>>> Coming back regarding my attempts to get encoding using
> > >>>>>
> > >>>>> vaapi-hardware
> > >>>>>
> > >>>>>>>> acceleration to work...
> > >>>>>>>>
> > >>>>>>>> First, Vincent, concerning your point of ffmpeg not being
> > >>>
> > >>> compiled
> > >>>
> > >>>>> with
> > >>>>>
> > >>>>>>>> vaapi
> > >>>>>>>> enabled in Debian - well, that's correct and not correct
> > >
> > > somehow:
> > >>>>> it's
> > >>>>>
> > >>>>>>>> not
> > >>>>>>>> compiled with enable-vaapi, but vaapi is still working (at least
> > >>>
> > >>> in
> > >>>
> > >>>>>>>> stretch),
> > >>>>>>>> see this Debian bug
> > >>>>>>>> report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=830880
> > >>>>>>>>
> > >>>>>>>> For me, a command like
> > >>>>>>>> ffmpeg -vaapi_device /dev/dri/renderD128 -i infile.MP4 -vf
> > >>>>>>>> 'format=nv12,hwupload' -c:v h264_vaapi outfile.mp4
> > >>>>>>>> works fine and encoding 4K video runs about 4x faster!
> > >>>>>>>>
> > >>>>>>>> What I struggle with is adding these options into the rendering
> > >>>>>
> > >>>>> profile
> > >>>>>
> > >>>>>>>> or
> > >>>>>>>> to
> > >>>>>>>> begin with into the rendering script. I created the rendering
> > >>>
> > >>> script
> > >>>
> > >>>>>>>> which
> > >>>>>>>> contains the line PARAMETERS_0. But how can I add these
> > >>>>>>>> vaapi-related
> > >>>>>>>> options?
> > >>>>>>>> Which one goes where? Any hints are very welcome ;-)
> > >>>>>>>>
> > >>>>>>>> Thanks a lot.
> > >>>>>>>>
> > >>>>>>>> Best,
> > >>>>>>>> Bernd
> > >>>>>>>>
> > >>>>>>>> On Dienstag, 8. August 2017 14:31:13 CEST Vincent Pinon wrote:
> > >>>>>>>>> Hello,
> > >>>>>>>>>
> > >>>>>>>>> Note that you need to have FFmpeg built with vaapi or nvenc
> > >>>>>
> > >>>>> support,
> > >>>>>
> > >>>>>>>> which
> > >>>>>>>>
> > >>>>>>>>> is not the case of Debian package. I don't know what's needed
> > >>>
> > >>> for
> > >>>
> > >>>>>>>>> Intel,
> > >>>>>>>>> but for NVidia you have to download a SDK linked to
> > >>>
> > >>> closed-source
> > >>>
> > >>>>>>>>> driver,
> > >>>>>>>>> providing personal information: showstopper for me (and many
> > >>>>>>>>> packagers)
> > >>>>>>>>>
> > >>>>>>>> :\
> > >>>>>>>> :
> > >>>>>>>>> Please let us know of any progress on your side.
> > >>>>>>>>>
> > >>>>>>>>> Evert, did you try to share your custom profiles using
> > >>>>>
> > >>>>> "HotNewStuff"
> > >>>>>
> > >>>>>>>>> function in Kdenlive? ;)
> > >>>>>>>>>
> > >>>>>>>>> Vincent
> > >>>>>>>>>
> > >>>>>>>>> Le mardi 8 août 2017, 12:47:31 CEST Evert Vorster a écrit :
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> Hi there, Bernd.
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> Kdenlive supports hardware encoding through custom encoding
> > >>>>>
> > >>>>> profiles.
> > >>>>>
> > >>>>>>>>> This is my profile for hardware hevc encoding with nvidia:
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> properties=x265-medium f=matroska vcodec=hevc_nvenc acodec=aac
> > >>>>>>>>
> > >>>>>>>> crf=%quality
> > >>>>>>>>
> > >>>>>>>>> ab=%audiobitrate+'k'
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> It would have been awesome if mlt and ffmpeg used the same
> > >>>
> > >>> format
> > >>>
> > >>>>> in
> > >>>>>
> > >>>>>>>> command
> > >>>>>>>>
> > >>>>>>>>> lines, but this is not the case. At least they are close.
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> Unfortunately I only have intel cards, so I cannot test the
> > >>>
> > >>> intel
> > >>>
> > >>>>>>>>> vaapi
> > >>>>>>>>> acelleration for you.
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> Kind regards,
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> On 8 August 2017 at 10:35, B.M. <b-misc at gmx.ch[1]> wrote:
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> Dear all,
> > >>>>>>>>>
> > >>>>>>>>> After some years without I'm getting back to video editing...
> > >>>>>>>>> I
> > >>>>>>>>> already
> > >>>>>>>>> searched quite a lot but it's really hard to find "realiable"
> > >>>>>>>>
> > >>>>>>>> information,
> > >>>>>>>>
> > >>>>>>>>> so I decided to ask here:
> > >>>>>>>>>
> > >>>>>>>>> - It seems that hw accel is not available in kdenlive
> > >>>>>>>>>
> > >>>>>>>>> - As far as I understand kdenlive uses mlt which uses ffmpeg.
> > >>>>>
> > >>>>> ffpmeg
> > >>>>>
> > >>>>>>>>> can
> > >>>>>>>>
> > >>>>>>>> use
> > >>>>>>>>
> > >>>>>>>>> hardware acceleration for de- and encoding. So is mlt to
> > >>>
> > >>> "blame"
> > >>>
> > >>>>> for
> > >>>>>
> > >>>>>>>>> missing hw accel. in kdenlive?
> > >>>>>>>>>
> > >>>>>>>>> - There has been a patch (bug 378832) "use of vaapi in
> > >>>
> > >>> transcoding
> > >>>
> > >>>>> and
> > >>>>>
> > >>>>>>>>> rendering" which seems to tackle my question. But what did it
> > >>>>>
> > >>>>> really
> > >>>>>
> > >>>>>>>> change
> > >>>>>>>>
> > >>>>>>>>> -/ what is it for? I didn't find more info on that and it's in
> > >>>>>>>>> kdenlive
> > >>>>>>>>> 17.04, while Debian is at 16.12. and before I compile myself
> > >>>
> > >>> I'd
> > >>>
> > >>>>> like
> > >>>>>
> > >>>>>>>>> to
> > >>>>>>>>> get more info.
> > >>>>>>>>>
> > >>>>>>>>> - Furthermore I found a thread on this list back in April
> > >>>>>>>>> "kdenlive
> > >>>>>>>>> and
> > >>>>>>>>
> > >>>>>>>> mlt
> > >>>>>>>>
> > >>>>>>>>> nvenc enabled" covering the same topic but for nvidia instead
> > >>>
> > >>> of
> > >>>
> > >>>>> Intel
> > >>>>>
> > >>>>>>>>> graphics; unfortunately nobody reported back if it really
> > >>>
> > >>> works.
> > >>>
> > >>>>> For
> > >>>>>
> > >>>>>>>>> me
> > >>>>>>>>
> > >>>>>>>> it
> > >>>>>>>>
> > >>>>>>>>> reads like the patch I mentioned above.
> > >>>>>>>>>
> > >>>>>>>>> So regarding the current state of hw accel in kdenlive I'm
> > >>>
> > >>> still
> > >>>
> > >>>>>>>> uncertain.
> > >>>>>>>>
> > >>>>>>>>> Thank you for your inputs.
> > >>>>>>>>>
> > >>>>>>>>> Kind regardsBernd
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> Evert VorsterIsometrix Acquistion Superchief
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>>
> > >>>>>>>>> --------
> > >>>>>>>>> [1] mailto:b-misc at gmx.ch
>
>
>
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