Hardware acceleration / vaapi

[B.M.]

Hi all,

Well so I can expect hw accel for ENcoding to work. What's about DEcoding? Can that be enabled as well?

Is it correct that direct raw copying (no de- and re-encoding) is not possible? Would be soooo nice (speedup & image quality) for all the clips which rest unchanged! I know that this is a missing feature on the mlt side; having a background in programming myself I know how ugly a workaround can be, but: did you dev's discuss that in the past? As I said, only for unchanged clips (I have 4K editing in mind...)

Best,
Bernd

PS: I will see how to compile ffmpeg with hw accel enabled.

Am 8. August 2017 14:31:13 MESZ schrieb Vincent Pinon <vpinon at kde.org>:
>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

-- 
Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail gesendet.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/kdenlive/attachments/20170808/9ee23eb0/attachment.html>