[FFmpeg-trac] #8512(undetermined:open): The Vulkan based filter scale_vulkan does not work on NVIDIA hardware.

[FFmpeg]

#8512: The Vulkan based filter scale_vulkan does not work on NVIDIA hardware.
-------------------------------------+-------------------------------------
             Reporter:  Brainiarc7   |                    Owner:  philipl
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Brainiarc7):

 Hello @philipl,

 With your recommendation:

 {{{
    ffmpeg -threads 1 -loglevel info -nostdin -y \
    -fflags +genpts-fastseek \
    -init_hw_device cuda=cuda:0 -filter_hw_device cuda \
    -hwaccel nvdec -hwaccel_output_format cuda -extra_hw_frames 2 \
    -reinit_filter 1 -vsync 1 -async 1 -filter_threads 2
 -filter_complex_threads 2 \
    -i feeds.mp4 -filter_complex \
   "[0:v]hwupload=derive_device=vulkan,split=2[s0][s1]; \
 [s0]scale_vulkan=w=1920:h=1080:scaler=0,hwupload=derive_device=cuda[v0]; \
    [s1]scale_vulkan=w=1280:h=720:scaler=0,hwupload=derive_device=cuda[v1]"
 \
   -map "[v0]" -b:v:0 5800k -minrate:v:0 5800k -maxrate:v:0 5800k
 -bufsize:v:0 5800k -c:v:0 h264_nvenc -r:v:0 ntsc \
   -profile:v:0 high -preset:v:0 llhp -rc:v:0 cbr_ld_hq -g:v:0 60 -gpu:v:0
 0 -strict_gop:v:0 1 -bf:v:0 0 \
   -map "[v1]"  -b:v:1 4000k -minrate:v:1 4000k -maxrate:v:1 4000k
 -bufsize:v:1 4000k -c:v:1 h264_nvenc -r:v:1 ntsc \
   -profile:v:1 high -preset:v:1 llhp -rc:v:1 cbr_ld_hq -g:v:1 60 -gpu:v:1
 0 -strict_gop:v:1 1 -bf:v:1 0 \
   -map 0:a -c:a libfdk_aac -ac 2 -ar 48000 -b:a 128k \
   -flags +global_header+cgop \
   -max_muxing_queue_size 9000000 -threads 2 -f tee  \
   "[select=\'v:0,a\':f=mp4]'hq.mp4'| \
    [select=\'v:1,a\':f=mp4]'med.mp4'"

 }}}

 That command works and its' exceptionally *faster* than the prior variant
 above.

 The encoder in this case runs at about ~10x on an RTX 2080.
 The previous command (with the repeated hwdownload instances) run at a
 paltry ~1.5x.

 That's a ~7x speed up!

 Thank you so much :-)

 I can now (safely) close this ticket.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8512#comment:5>
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