Incredible Render Performance In Kdenlive With NVENC - But 1 Big Problem

[Eugen Mohr]

You render it with MLT 11.0. Kdenlive refactoring runs MLT 10.0. Try 
with the actual AppImage 18.08.Beta 18.


Am 22.07.2018 um 16:15 schrieb johnar1:
> Ok, I think I have isolated the problem now.
>
> I just compiled kdenlive from the latest git, everything works and I 
> get the following warning before launching it. (Screenshot attached)
>
> The following codecs are missing: libx265, nvenc_h264, h264_nvenc
>
> The Appimage version does not state this warning as it probably 
> already comes with the necessary stuff.
>
> So the final question is, how do I get these codecs?
> The only thing you can manually install that is related to nvenc, are 
> the headers themselves, which I already have installed.
>
> Any ideas?
>
>
> Sent with ProtonMail <https://protonmail.com> Secure Email.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On July 16, 2018 2:48 PM, Eugen Mohr <eugen.mohr at gmx.net> wrote:
>
>> On a first look:
>>
>> File which runs:
>>
>> MLT version 6.7.0
>>
>> frame_rate_den="1"
>>
>> 60 fps
>>
>> name="length">53282
>>
>>
>> file which doesn't run:
>>
>> MLT version 6.10.0 → version of the Kdenlive refactoring
>>
>> frame_rate_den="1001"
>>
>> 29.97 fps
>>
>> name="length">00:14:48;00
>>
>>
>> check this parameters with other files
>>
>>
>>
>> *Gesendet:* Montag, 16. Juli 2018 um 07:51 Uhr
>> *Von:* johnar1 <johnar1 at protonmail.com>
>> *An:* "kdenlive at kde.org" <kdenlive at kde.org>
>> *Betreff:* Incredible Render Performance In Kdenlive With NVENC - But 
>> 1 Big Problem
>>
>>
>> System: i5 6600K, 1050TI, Ubuntu 18.04, Kernel 4.16
>> I have successfully compiled mlt and ffmpeg with nvenc support using 
>> the official nvenc headers stripped from the Nvidia SDK.
>> Rendering the first minute of the 1080p Sintel version, with 4 
>> threads specified and my nvenc profile, finishes in 10 seconds.
>> Sintel can be downloaded here: https://durian.blender.org/download/ 
>> <https://durian.blender.org/download/[/url>
>> Nvenc Profile: (compatible with recent mlt versions who are nvenc 
>> enabled by deafult)
>> f=mp4 vcodec=nvenc_h264 global_quality=21 vq=21 preset=slow bf=2 ab=384k
>>
>>
>> Now here is the problem that I do not understand:
>> Using the latest version of kdenlive from the kdenlive-master ppa 
>> combined with the newly compiled versions of ffmpeg and mlt works 
>> perfectly, but only under very specific circumstances.
>>
>> I have only been able to get rendering with nvenc to work properly 
>> when I use and open this specific kdenlive [b]save file[/b] which I 
>> made of the first minute of the Sintel short film with the Appimage 
>> Version of Kdenlive. After launching the ppa/installed version of 
>> kdenlive and opening this save file, rendering with nvenc works 
>> flawlessly.
>>
>> If I simply start a new project, adding the whole Sintel short film 
>> to the project bin, cutting the first minute and render it, nvenc 
>> simply does not work and the render time is tripled, despite having 
>> changed nothing else, including the nvenc render profile.
>>
>> If I create a save file of the first minute of Sintel with the 
>> installed version and open it on the Appimage version, nvenc does not 
>> work again.
>>
>> Conclusion: There must be something in this save file, maybe a 
>> parameter, additonal settings or any type of code not present in the 
>> default kdenlive project profiles, which enables NVENC.
>>
>> I would greatly appreciate it if we could find out the source of this 
>> problem together.
>>
>> Kdenlive Appimage Save File with which NVENC works:
>> https://pastebin.com/rzjR57DJ
>>
>> PPA/Installed Version of Kdenlive created Save File which breaks NVENC:
>> https://pastebin.com/3uQ8sP0C
>>
>

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