_make/video.mk



# Make snippet for rendering development animation
#
# Copyright 2025, Jonas Smedegaard <dr@jones.dk>
# SPDX-License-Identifier: GPL-3-or-later
#
# Setup:
# In main Makefile...
#  * optionally set variable VIDEO_FILES
#  * optionally set variable VIDEO_TITLE
#  * include this make snippet
#
# Dependencies:
#  * gource <http://gource.io/>
#  * ffmpeg <https://www.ffmpeg.org/>
#  * perl

# ffmpeg executable and generic scripting arguments
FFMPEG = ffmpeg -hide_banner -nostdin -y

# title to optionally include in animation
#VIDEO_TITLE =

# list of target animation files
VIDEO_FILES ?= animation.mp4

videos: $(VIDEO_FILES)

%.log:
    gource --output-custom-log - | perl -p \
     -e 's/(LICENSE|README|txt)\K$$/.plaintext/;' \
     -e 's/q?md\K$$/.markdown/;' \
     -e 's/(otf|woff2)\K$$/.font/;' \
     -e 's/(jpe?g|png)\K$$/.image/;' \
     -e 's/(html|pdf|svg)\K$$/.layout/;' \
     -e 's/(css|json|gitignore|ya?ml)\K$$/.data/;' \
     -e 's/(js|lua|Makefile|mk|rb|rust|scss|sh|tex)\K$$/.code/' \
     > $@

%_ffv.mkv: %.log
    gource $< -1280x720 -r 25 --multi-sampling \
     --disable-input --hide mouse,progress,filenames,bloom \
     $(VIDEO_TITLE:%=--title "%") --highlight-users --key \
     -o - | $(FFMPEG) -r 25 -f image2pipe -vcodec ppm -i - \
     -vcodec ffv1 -level 3 -threads 0 $@

%.mp4: %_ffv.mkv
    $(FFMPEG) -i $< -vcodec libx264 -preset slow -pix_fmt yuv420p \
     -crf 27 -tune animation -threads 0 -bf 0 $@

%_hevc.mp4: %_ffv.mkv
    $(FFMPEG) -i $< -vcodec libx265 -preset slow -pix_fmt yuv420p \
     -crf 26 -tune animation -threads 0 -bf 0 $@

%.webm: %_ffv.mkv
    $(FFMPEG) -i $< -vcodec libvpx \
     -crf 30 -threads 0 -bf 0 $@

%_vp9.webm: %_ffv.mkv
    $(FFMPEG) -i $< -vcodec libvpx-vp9 \
     -crf 30 -threads 0 -bf 0 $@

%_av1.mkv: %_ffv.mkv
    $(FFMPEG) -i $< -vcodec libaom-av1 \
     -crf 30 -threads 0 -bf 0 $@

.PHONY: videos