[Libav-user] How to optimize v360 filter config_output

[Paul B Mahol]

On Fri, Jan 29, 2021 at 4:59 PM thông trần minh <minhthong494 at gmail.com>
wrote:

> here is the my v360 filter setting v360=input=fisheye:output=flat:ih_fov=180:iv_fov=180:h_fov=95:v_fov=90:w=%d:h=%d:roll=%d:pitch=%d:rorder=rpy
> .
> I ran some debug and found that both s->in_transform and s->out_transform
> were FISHEYE.
>

Your debugging session info is not correct, as with above options that
could not happen.


> Is it possible to bring the current algorithm to GPU. May I ask for
> documentation/article on how the algorithm works?
>

GPU version of filter may be implemented fully by using vulkan API, I'm
looking for sponsors.
Until then you could make use of program_opencl filter, if you have OpenCL
compatible hardware.
Note that program_opencl filter does not support filter commands, but that
could be added somehow I guess.


>
> Vào Th 6, 29 thg 1, 2021 vào lúc 18:47 Paul B Mahol <onemda at gmail.com>
> đã viết:
>
>>
>>
>> On Thu, Jan 28, 2021 at 12:16 PM thông trần minh <minhthong494 at gmail.com>
>> wrote:
>>
>>> Hi everyone,
>>>
>>> I'm trying to change v360 filter params such as roll, pitch at
>>> real-time speed. I'm using avfilter_graph_send_command() to make thing
>>> happen. The problem came when the image became larger (4096 × 2160 or
>>> larger), it took more time to init a new filter graph. I found that
>>> most of the time it spent on running this callback v360_slice() . Firstly,
>>> I thought I could vectorize two for loops inside v360_slice() but I was
>>> unable to understand the algorithm in it. I tried to increase the number of
>>> threads processing the slices but it did not work.
>>>  I'm appreciated any advice to help me deal with it.
>>>
>>
>> Also you have not provided info what input/output projection you use.
>>
>>
>>>
>>>
>>> https://github.com/FFmpeg/FFmpeg/search?q=static+av_always_inline+int+v360_slice
>>>
>>> Regards,
>>>
>>> thongtm2
>>>
>>> Vào Th 5, 28 thg 1, 2021 vào lúc 17:59 thông trần minh <
>>> minhthong494 at gmail.com> đã viết:
>>>
>>>> Hi everyone,
>>>>
>>>> I'm trying to change v360 filter params such as roll, pitch at
>>>> real-time speed. I'm using avfilter_graph_send_command() to make thing
>>>> happen. The problem came when the image became larger, it took more time to
>>>> init a new filter graph. I found that most of the time it spent on running
>>>> this callback v360_slice()
>>>>
>>>> ---------------------------------------
>>>> *Full Name*: Trần Minh Thông
>>>> *Phone*: (+84) 38 731 0304
>>>> --------------------------------------
>>>>
>>>> _______________________________________________
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>>
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>
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