optimize_movie_to_ipod.mk

.PHONY: target clean clean-video-objs clean-audio-objs metadata pass1 pass2

video_width := 432
# video_crf := 23
video_bitrate := 192000
# video_2pass = no

ifeq ($(video_2pass),)
ifdef video_bitrate
video_2pass = yes
else
video_2pass = no
endif
endif

audio_bitrate := 128000
audio_sampling_rate := 44100
audio_data_format = aac@$(audio_sampling_rate)
# audio_data_format = aac

WORKDIR := work
PREFIX_CMD :=

SRC := mkv/title00.mkv
METADATA := metadata.ini
COVER := cover.jpg

TARGET := output.mp4

ifeq ($(video_2pass),yes)
VIDEO_TARGET = $(WORKDIR)/x264-2.m4v
VIDEO_OBJS = \
	$(WORKDIR)/pass1.timestamp \
	$(WORKDIR)/pass2.timestamp \
	$(WORKDIR)/x264-0.log \
	$(WORKDIR)/x264-0.log.mbtree \
	$(WORKDIR)/x264-1.m4v \
	$(WORKDIR)/x264-2.m4v
else
VIDEO_TARGET = $(WORKDIR)/x264.m4v
VIDEO_OBJS = \
	$(WORKDIR)/x264.m4v
endif

AUDIO_TARGET = $(WORKDIR)/aac.m4a
AUDIO_OBJS = \
	$(WORKDIR)/alac.m4a \
	$(WORKDIR)/aac.m4a

target: $(TARGET)

clean:
	rm -f $(TARGET) $(VIDEO_OBJS) $(AUDIO_OBJS)

clean-video-objs:
	rm -f $(VIDEO_OBJS)

clean-audio-objs:
	rm -f $(AUDIO_OBJS)

metadata:
	ffmpeg -i $(SRC) -f ffmetadata - 2> /dev/null

$(TARGET): $(VIDEO_TARGET) $(AUDIO_TARGET) $(METADATA) $(COVER)
	$(PREFIX_CMD) ffmpeg \
	  -loglevel warning \
	  -y \
	  -i $(METADATA) \
	  -i $(VIDEO_TARGET) \
	  -i $(AUDIO_TARGET) \
	  -i $(COVER) \
	  -codec copy \
	  -map_metadata 0 \
	  -map_chapters 0 \
	  -map 1 \
	  -map 2 \
	  $@

pass1: $(WORKDIR)/pass1.timestamp
pass2: $(WORKDIR)/pass2.timestamp

$(WORKDIR)/x264-0.log: $(WORKDIR)/pass1.timestamp
$(WORKDIR)/x264-1.m4v: $(WORKDIR)/pass1.timestamp
$(WORKDIR)/x264-2.m4v: $(WORKDIR)/pass2.timestamp

video_filter_format = format=yuv420p
video_filter_scale = scale=$(video_width):-1:flags=lanczos
video_filter = $(video_filter_format),$(video_filter_scale)
# video_filter_decimate = mpdecimate,setpts=N/FRAME_RATE/TB
# video_filter = $(video_filter_format),$(video_filter_scale),$(video_filter_decimate)

# audio_filter_decimate = asetpts=N/SAMPLE_RATE/TB
# audio_filter = $(audio_filter_decimate)

FFMPEG_COMMON_FLAGS = \
	  -threads 0 \
	  -loglevel warning \
	  -guess_layout_max 0 \
	  -y

FFMPEG_VIDEO_FLAGS = \
	  -codec:v libx264 \
	  -preset medium \
	  -tune film,fastdecode \
	  -profile:v main \
	  -level 3.0 \
	  -movflags +faststart

ifdef video_filter
FFMPEG_VIDEO_FLAGS += -vf "$(video_filter)"
endif

ifdef video_crf
FFMPEG_VIDEO_FLAGS += -crf $(video_crf)
endif

ifdef video_bitrate
FFMPEG_VIDEO_FLAGS += -b:v $(video_bitrate)
endif

FFMPEG_AUDIO_FLAGS = \
	  -codec:a alac

ifdef audio_filter
FFMPEG_AUDIO_FLAGS +=
	  -af "$(audio_filter)"
endif

$(WORKDIR)/x264.m4v: $(SRC)
	$(PREFIX_CMD) ffmpeg \
	  $(FFMPEG_COMMON_FLAGS) \
	  -fflags +genpts \
	  -i $(SRC) \
	  $(FFMPEG_VIDEO_FLAGS) \
	  -an \
	  $@

$(WORKDIR)/pass1.timestamp: $(SRC)
	$(PREFIX_CMD) ffmpeg \
	  $(FFMPEG_COMMON_FLAGS) \
	  -fflags +genpts \
	  -i $(SRC) \
	  $(FFMPEG_VIDEO_FLAGS) \
	  -pass 1 \
	  -passlogfile $(WORKDIR)/x264 \
	  -an \
	  $(WORKDIR)/x264-1.m4v
	touch $@

$(WORKDIR)/pass2.timestamp: $(WORKDIR)/x264-0.log $(SRC)
	$(PREFIX_CMD) ffmpeg \
	  $(FFMPEG_COMMON_FLAGS) \
	  -fflags +genpts \
	  -i $(SRC) \
	  $(FFMPEG_VIDEO_FLAGS) \
	  -pass 2 \
	  -passlogfile $(WORKDIR)/x264 \
	  -an \
	  $(WORKDIR)/x264-2.m4v
	touch $@

$(WORKDIR)/alac.m4a: $(SRC)
	$(PREFIX_CMD) ffmpeg \
	  $(FFMPEG_COMMON_FLAGS) \
	  -i $(SRC) \
	  $(FFMPEG_AUDIO_FLAGS) \
	  -vn \
	  $@

$(WORKDIR)/aac.m4a: $(WORKDIR)/alac.m4a
	$(PREFIX_CMD) afconvert \
	  -f m4af \
	  -d $(audio_data_format) \
	  -b $(audio_bitrate) \
	  $(WORKDIR)/alac.m4a \
	  $@