[Request] Batch-Upscaling Request

[akai-katto]

Currently if a user wants to upscale multiple photos using waifu2x-ncnn-vulkan, it works as follows:

for every image in folder
| load vulkan runtime initialization
| load image
| upscale image
| save image

In a previous post you commented:

A really large portion of the consumed time is for the vulkan runtime initialization

If we can instead do

load vulkan runtime initialization
for every image in folder
| load image
| upscale image
| save image

We could save a lot of computational time. It could be used in dandere2x

https://github.com/aka-katto/dandere2x

and k4yt3x's video2x

https://github.com/k4yt3x/video2x

[nagadomi]

Moreover, load/save image(Disk IO, PNG decode/encode) are can be parallelized with upscale image(GPU task).

[sat3ll]

Duplicate of point 2, #20

[nihui]

https://github.com/nihui/waifu2x-ncnn-vulkan/releases/tag/20190712
just posted a new waifu2x-ncnn-vulkan release, please let me know if you encounter problems