How to get working 'blend' filter

[endryha]

I am trying to implement feature that blends 2 videos together but it seems that prebuilt ffmpeg binaries missing this filter. So is there a way to built in this filter?

Running ffmpeg -filters produces following output:

Filters: T.. = Timeline support .S. = Slice threading ..C = Commmand support A = Audio input/output V = Video input/output N = Dynamic number and/or type of input/output | = Source or sink filter T.. adelay A->A Delay one or more audio channels. ... aecho A->A Add echoing to the audio. ... aeval A->A Filter audio signal according to a specified expression. T.. afade A->A Fade in/out input audio. ... aformat A->A Convert the input audio to one of the specified formats. ... ainterleave N->A Temporally interleave audio inputs. ... allpass A->A Apply a two-pole all-pass filter. ... amerge N->A Merge two or more audio streams into a single multi-channel stream. ... amix N->A Audio mixing. ... anull A->A Pass the source unchanged to the output. T.. apad A->A Pad audio with silence. ... aperms A->A Set permissions for the output audio frame. ... aphaser A->A Add a phasing effect to the audio. ... aresample A->A Resample audio data. ... aselect A->N Select audio frames to pass in output. ... asendcmd A->A Send commands to filters. ... asetnsamples A->A Set the number of samples for each output audio frames. ... asetpts A->A Set PTS for the output audio frame. ... asetrate A->A Change the sample rate without altering the data. ... asettb A->A Set timebase for the audio output link. ... ashowinfo A->A Show textual information for each audio frame. ... asplit A->N Pass on the audio input to N audio outputs. ... astats A->A Show time domain statistics about audio frames. ... astreamsync AA->AA Copy two streams of audio data in a configurable order. ..C atempo A->A Adjust audio tempo. ... atrim A->A Pick one continuous section from the input, drop the rest. ... bandpass A->A Apply a two-pole Butterworth band-pass filter. ... bandreject A->A Apply a two-pole Butterworth band-reject filter. ... bass A->A Boost or cut lower frequencies. ... biquad A->A Apply a biquad IIR filter with the given coefficients. ... channelmap