r=radius p=powerboxblur=luma_r:luma_p[:chroma_r:chroma_p[:alpha_r:alpha_p]] #example ffmpeg -i input.mpg -vf boxblur = 1.5:1 output.mp4 smartblur #t = threashold smartblur = luma_r:luma_s:luma_t[:chroma_r:chroma_s:chroma_t] #example ffmpeg -i halftone.jpg -vf smartblur= ...
Rematrixing:istheprocessofchangingthechannellayout,forexamplefrom stereotomono. Whentheinputchannelscannotbemappedtotheoutputstreams,theprocessis lossy,sinceitinvolvesdifferentgainfactorsandmixing. 2、SwrContext结构体 SwrContext是音频转换的结构体,位于swresample_internal.h头文 ...
之前用ffmpeg解码出来了音频，只是做了存储部分，比如存储成aac文件，播放的话早期用的是sdl来播放音频，...