blob: 1a8bb45b7c17cc6cf23390f55bf598b6318f9fd1 (
plain)
- #!/bin/sh
- # FIXME: Handle audio
- set -e
- ##
- ## defaults
- ##
- INPUT=../src/omni/show0/earth.mp4
- LOGO=../../content/icon_small.png
- OUTPUT=../tmp/omni/show0/earth.dv
- RATIO=4:3
- HEIGHT=360
- videosize() { height=$1; width_or_ratio=$2;
- case $width_or_ratio in
- *:*) num=${width_or_ratio%:*}; den=${width_or_ratio#*:}; width=$((height*num/den));;
- *) width=$width_or_ratio;;
- esac
- echo_n $((height*width))
- }
- BITS=$(videosize "$HEIGHT" "$RATIO")
- # * bitrates and bits in parens based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html
- # + bits rounded up to include nearby modulo 16 formats
- # + best (i.e. high-modulo) 16:9 heights: 216 288 360 432 576 720
- # + best (i.e. high-modulo) 4:3 heights: 288 312 384 480 624 816
- if [ $BITS -le 110592 ]; then # 234p → 97344
- VBITRATE=145000
- elif [ $BITS -le 150528 ]; then # 270p → 129600
- VBITRATE=365000
- elif [ $BITS -le 196608 ]; then # 360p → 172800
- VBITRATE=730000
- elif [ $BITS -le 331776 ]; then # 432p → 331776
- VBITRATE=1100000
- elif [ $BITS -le 589824 ]; then # 540p → 518400
- VBITRATE=2000000
- elif [ $BITS -le 921600 ]; then # 720p → 921600
- VBITRATE=3000000
- fi
- mkdir -p $(dirname "$OUTPUT")
- # based on http://www.webmproject.org/docs/encoder-parameters/#real-time-cbr-encoding-and-streaming
- # + scale+watermark trick based on http://stackoverflow.com/a/10937357
- # + scale to square pixels as needed
- # + Add 1s latency (deadline)
- ffmpeg -hide_banner -threads auto -y \
- -i "$INPUT" \
- -i "$LOGO" \
- -filter_complex \
- "[0:v]scale=iw*sar*$HEIGHT/ih:$HEIGHT,setsar=1[bg];
- [bg][1:v]overlay=main_w-overlay_w-20:main_h-overlay_h-20[v]" \
- -map '[v]' \
- -target pal-dv "$OUTPUT"
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