[FFmpeg-devel] [DOC] Missing Parameter Description

[Santanu Biswas]

https://ffmpeg.org/doxygen/trunk/vf__amplify_8c_source.html#l00107
https://ffmpeg.org/doxygen/trunk/vf__atadenoise_8c_source.html#l00365
https://ffmpeg.org/doxygen/trunk/vf__avgblur_8c_source.html#l00290
https://ffmpeg.org/doxygen/trunk/vf__avgblur_vulkan_8c_source.html#l00133
https://ffmpeg.org/doxygen/trunk/vf__avgblur_vulkan_8c_source.html#l00178
https://ffmpeg.org/doxygen/trunk/vf__bilateral_8c_source.html#l00359
https://ffmpeg.org/doxygen/trunk/vf__bilateral_8c_source.html#l00380
https://ffmpeg.org/doxygen/trunk/vf__bilateral_8c_source.html#l00401
https://ffmpeg.org/doxygen/trunk/vf__blockdetect_8c_source.html#l00215
https://ffmpeg.org/doxygen/trunk/vf__blurdetect_8c_source.html#l00280
https://ffmpeg.org/doxygen/trunk/vf__bm3d_8c_source.html#l00749
https://ffmpeg.org/doxygen/trunk/vf__cas_8c_source.html#l00067
https://ffmpeg.org/doxygen/trunk/vf__cas_8c_source.html#l00134
https://ffmpeg.org/doxygen/trunk/vf__convolve_8c_source.html#l00700
https://ffmpeg.org/doxygen/trunk/vf__dblur_8c_source.html#l00224
https://ffmpeg.org/doxygen/trunk/vf__deblock_8c_source.html#l00333
https://ffmpeg.org/doxygen/trunk/vf__fftdnoiz_8c_source.html#l00547
https://ffmpeg.org/doxygen/trunk/vf__fftdnoiz_8c_source.html#l00646
https://ffmpeg.org/doxygen/trunk/vf__gblur_8c_source.html#l00244
https://ffmpeg.org/doxygen/trunk/vf__gblur_vulkan_8c_source.html#l00162
https://ffmpeg.org/doxygen/trunk/vf__guided_8c_source.html#l00295
https://ffmpeg.org/doxygen/trunk/vf__hysteresis_8c_source.html#l00107
https://ffmpeg.org/doxygen/trunk/vf__lagfun_8c_source.html#l00094
https://ffmpeg.org/doxygen/trunk/vf__limitdiff_8c_source.html#l00181
https://ffmpeg.org/doxygen/trunk/vf__limiter_8c_source.html#l00163
https://ffmpeg.org/doxygen/trunk/vf__maskedclamp_8c_source.html#l00108
https://ffmpeg.org/doxygen/trunk/vf__maskedmerge_8c_source.html#l00083
https://ffmpeg.org/doxygen/trunk/vf__maskedminmax_8c_source.html#l00160
https://ffmpeg.org/doxygen/trunk/vf__maskedthreshold_8c_source.html#l00143
https://ffmpeg.org/doxygen/trunk/vf__maskfun_8c_source.html#l00137
https://ffmpeg.org/doxygen/trunk/vf__maskfun_8c_source.html#l00179
https://ffmpeg.org/doxygen/trunk/vf__maskfun_8c_source.html#l00235
https://ffmpeg.org/doxygen/trunk/vf__median_8c_source.html#l00111
https://ffmpeg.org/doxygen/trunk/vf__median_8c_source.html#l00192
https://ffmpeg.org/doxygen/trunk/vf__midequalizer_8c_source.html#l00109
https://ffmpeg.org/doxygen/trunk/vf__mix_8c_source.html#l00156
https://ffmpeg.org/doxygen/trunk/vf__morpho_8c_source.html#l00824
https://ffmpeg.org/doxygen/trunk/vf__multiply_8c_source.html#l00108
https://ffmpeg.org/doxygen/trunk/vf__negate_8c_source.html#l00283
https://ffmpeg.org/doxygen/trunk/vf__pixelize_8c_source.html#l00201
https://ffmpeg.org/doxygen/trunk/vf__premultiply_8c_source.html#l00486
https://ffmpeg.org/doxygen/trunk/vf__threshold_8c_source.html#l00092
https://ffmpeg.org/doxygen/trunk/vf__tmidequalizer_8c_source.html#l00262
https://ffmpeg.org/doxygen/trunk/vf__vaguedenoiser_8c_source.html#l00424
https://ffmpeg.org/doxygen/trunk/vf__varblur_8c_source.html#l00223
https://ffmpeg.org/doxygen/trunk/vf__varblur_8c_source.html#l00270
https://ffmpeg.org/doxygen/trunk/vf__xmedian_8c_source.html#l00151
https://ffmpeg.org/doxygen/trunk/vf__yaepblur_8c_source.html#l00237

All of the aforementioned filters use a parameter `plane' for
processing a specific set of plane(s) but the documentation at
https://ffmpeg.org/ffmpeg-filters.html lacks an explanation for these.
Observing the source code yields that it is a bitmask for selecting
filtering planes, in sequential order as per pixel format.