Creating a wide-color HDR time lapse using FFMpeg

Makefile

# ffmpeg encoder Makefile to build a consolidated video from multiple
# image sequences with potentially varying frame rates
#
# Create subdirectories containing the image sequence files and a
# special file called FPS, which should just contain the desired
# frame rate. For example, this structure:
#
# TOPDIR
# |-- Makefile
# |-- final.txt
# |-- mountains/
# |   |-- FPS
# |   |-- image001.tiff
# |   |-- image002.tiff
# |   |-- ...
# |-- cityscape/
# |   |-- FPS
# |   |-- image001.tiff
# |   |-- image002.tiff
# |   |-- ...
#
# would create a final.m4v made up of two scenes. Scene order is
# controlled by the contents of the final.txt file, which is an
# ffmpeg concat demuxer input file (see https://trac.ffmpeg.org/wiki/Concatenate#demuxer)
# that might look like this:
#
# ---  final.txt  ---
# file './mountains.m4v'
# file './cityscape.m4v'
# -------------------
#
# The final M4V will contain the image sequence consisting of the
# files from the mountains/ directory, at the framerate specified by 
# mountains/FPS, and then similarly the image sequence from the 
# cityscape/ directory.

SHELL := /usr/local/bin/bash
SUBDIRS := $(patsubst %/.,%,$(wildcard */.))
SCENES := $(patsubst %,%.m4v,$(SUBDIRS))
INPUT_TYPE := tiff

all: final.m4v

clean:
	rm -f $(SCENES) final.m4v

final.m4v: $(SCENES) final.txt
	ffmpeg \
	  -y \
	  -safe 0 \
	  -f concat \
	  -i final.txt \
	  -c copy \
	  -vtag hvc1 \
	  -f mp4 \
	  -movflags +faststart \
	  final.m4v

%.m4v: %/*.${INPUT_TYPE} %/FPS
	$(call compile_image_sequence,$*)

$(SUBDIRS): % : %.m4v

.PHONY: all $(SUBDIRS)

define compile_image_sequence
  cd $(1) && ffmpeg \
    -y \
    -framerate $(shell cat ${1}/FPS) \
    -pattern_type glob \
    -i "*.${INPUT_TYPE}" \
    -vcodec libx265 \
    -crf 14 \
    -pix_fmt yuv420p \
    -vtag hvc1 \
    -f mp4 \
    -movflags +faststart \
    -r 60 \
    "../$(1).m4v"
endef

timelapse.md

ffmpeg \
  -framerate 30 \
  -pattern_type glob \
  -i "*.tif" \
  -vcodec libx265 \
  -vtag hvc1 \
  -crf 14 \
  -pix_fmt yuv420p10le \
  -vf scale=-1:2160 \
  -f mp4 \
  -x265-params "colorprim=bt2020:transfer=smpte2084:colormatrix=bt2020nc"
  output-filename.m4v