[Libav-user] How to optimize v360 filter config_output

[thông trần minh]

Many thanks, Paul, for your detailed answer.
I just want to confirm that s->in_transform was FISHEYE and
s->out_transform was FLAT.

Regards,
thong

Vào Th 6, 29 thg 1, 2021 vào lúc 23:09 Paul B Mahol <onemda at gmail.com> đã
viết:

>
>
> 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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