Hardware acceleration / vaapi

[Evert Vorster]

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> 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 regards
> Bernd




-- 
Evert Vorster
Isometrix Acquistion Superchief
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