[FFmpeg-devel] [vf_tonemap_cuda] VERY alpha ground work- implemented only reinhard

[Felix LeClair]

Not sure what you mean by that?


On Thu, Jan 14, 2021 at 9:15 pm, Lynne <dev at lynne.ee> wrote:
> Jan 14, 2021, 21:01 by felix.leclair123 at hotmail.com 
> <mailto:felix.leclair123 at hotmail.com>:
> 
>>  Hey everyone!
>> 
>>  Trying to wrap my mind around how to deal with cuda HW frames and 
>> how to implement them.
>> 
>>  The goal of this filter once completed will be to take in a cuda 
>> frame, tonemap the value to a given specification using a user 
>> requested algorithm (mobius, hable reinhard clip etc.)
>> 
>>  This is useful because it completes (should) outperform cpu based 
>> tonemapping by multiple 1-3 orders of magnitude depending on the gpu 
>> used for the filter.
>> 
>>  I've based the attached filter off of the vf_scale_cuda.cu filter.
>> 
>>  For ease of developement, I've kept everything the same including 
>> the name of the filter, only changing the funtion within the file. 
>> This is very much a bodge to facilitate development.  As such, for 
>> testing, this file should replace the vf_scale_cuda.cu file in 
>> ffmpeg/libavfilter/vf_scale_cuda.cu
>> 
>>  FFmpeg should then be compiled as standard for cuda filters and 
>> should be called as you would call the standard vf_scale_cuda filter.
>>  The command would be similar to:
>>   ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i 
>> input.mp4 -vf scale_cuda=Source_width:Source_Height -c:a copy -c:v 
>> h264_nvenc -b:v 5M output.mp4
>> 
>>  The above should decode in hardware, tonemap the frame on gpu and 
>> re-encode in hardware at a given bitrate.
>> 
>>  will be in the freenode soon after sending this email (going to put 
>> on another cup of coffee )
>> 
>>  Thanks,
>> 
>>  FelixCLC (felix__)
>> 
>>  Caviat: Like all HW filters, how effective this is will depend on 
>> how much overhead is faced by doing a memcpy over the pcie bus to 
>> the gpu itself, then passing the data back once processed.
>> 
> 
> Could we not have another bitrotting tonemap implementation?
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