ffmpeg version 4.4.2-1 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 8 (Uos 8.3.0.3-3+rebuild) configuration: --prefix=/usr --extra-version=1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu -- incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --disable-sndio --enable-pocketsphinx --enable-librsvg --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared c0_expr <string> ..FV.....T. set color component #0 expression c1_expr <string> ..FV.....T. set color component #1 expression c2_expr <string> ..FV.....T. set color component #2 expression c3_expr <string> ..FV.....T. set color component #3 expression all_expr <string> ..FV.....T. set expression for all color components c0_opacity <double> ..FV.....T. set color component #0 opacity (from 0 to 1) (default 1) c1_opacity <double> ..FV.....T. set color component #1 opacity (from 0 to 1) (default 1) c2_opacity <double> ..FV.....T. set color component #2 opacity (from 0 to 1) (default 1) c3_opacity <double> ..FV.....T. set color component #3 opacity (from 0 to 1) (default 1) all_opacity <double> ..FV.....T. set opacity for all color components (from 0 to 1) (default 1) framesync AVOptions: eof_action <int> ..FV....... Action to take when encountering EOF from secondary input (from 0 to 2) (default repeat) repeat 0 ..FV....... Repeat the previous frame. endall 1 ..FV....... End both streams. pass 2 ..FV....... Pass through the main input. shortest <boolean> ..FV....... force termination when the shortest input terminates (default false) repeatlast <boolean> ..FV....... extend last frame of secondary streams beyond EOF (default true) This filter has support for timeline through the 'enable' option.