[Bug 4165] Review Request: nvidia-video-codec-sdk - Hardware accelerated video encode and decode

[RPM Fusion Bugzilla]

https://bugzilla.rpmfusion.org/show_bug.cgi?id=4165

--- Comment #5 from Nicolas Chauvet <kwizart at gmail.com> 2016-08-05 14:42:42 CEST ---
(In reply to comment #4)
..
> > At runtime, you will need the xorg-x11-drv-nvidia-cuda package (and the nvidia
> > card recent enought for the feature).
> 
> cuda is optional with nvenc 
Sure, it's optional at buildtime and runtime. But then at runtime nvenc enabled
ffmpeg will dlopen libnvidia-encode.so (the unversionned SO) That libraries is
currently provided by the -cuda subpackage.  (despite it's name, libraries
doesn't all relate to cuda indeed)
If the cuda option is enabled in ffmpeg, it will also dlopen libcuda.so

The main purpose of this cuda sub-package was to have all libraries that would
only rely on -cuda + nvidia-kmod (and not main + -libs). So cuda developpers
would only needs -cuda + nvidia-kmod to install the NVIDIA CUDA toolkit. (at
some point, the nvEncodeAPI.h was distributed as part of the toolkit IIRC).
This was specially usefull for optimus enabled laptop using the intel adapter
for display and using the nvidia GPU for CUDA (that will then miss the cuda/gl
interrop, but not as much important).


Now the real concern is to have the ffmpeg binary not to crash if users try to
use ffmpeg nvenc without the required hw or installed libraries.


> > Can you post a ldd output of your build of libavcodec.so to verify the linked
> > libraries ?
> 
> $ ldd /usr/lib64/libavcodec.so
Okay, so no direct link time dependencies, only dlopen as expected.

> > I would be more confortable if we could have it enabled in a ffmpeg-nonfree 
> 
> Why nonfree
That ffmpeg build will be provided in the nonfree section and will be allowed
to build nonfree dependencies and libraries along with enabling nvenc (and as
such dlopen a nonfree library).

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