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* refactor(docs): separate Pages site source * fix(docs): preserve published guide pages * fix(ci): run asset ownership tests for site changes * fix(docs): track future website media * fix(ci): let Pages deployments finish * build(deps): update Pages checkout action * fix(ci): follow moved setup guide * fix(docs): repair published setup guide * fix(docs): retarget preview encoder
39 lines
1.5 KiB
Bash
Executable file
39 lines
1.5 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Encode a source screen-recording (.mkv) into web-optimized preview clips for
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# the landing page: website/<name>.webm (VP9) + website/<name>.mp4 (H.264).
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#
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# ./encode_previews.sh <input> <name> [max_secs]
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#
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# - scales to 720p height (even dims), strips audio, yuv420p for broad support
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# - if the clip is longer than max_secs (default 30), it's sped up to fit, so
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# loops stay snappy instead of dragging
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# - MP4 gets +faststart so it starts without downloading the whole file
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set -euo pipefail
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IN="${1:?input file}"
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NAME="${2:?output basename}"
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MAX="${3:-30}"
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OUT_DIR="$(cd "$(dirname "$0")/../website" && pwd)"
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dur=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$IN" | cut -d. -f1)
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dur=${dur:-0}
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SPEED_VF=""
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if [ "$dur" -gt "$MAX" ] && [ "$MAX" -gt 0 ]; then
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# setpts factor <1 speeds up; e.g. 30/60 = 0.5x duration => 2x speed
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factor=$(awk "BEGIN{printf \"%.4f\", $MAX/$dur}")
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SPEED_VF="setpts=${factor}*PTS,"
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echo " ($IN is ${dur}s > ${MAX}s -> speeding up x$(awk "BEGIN{printf \"%.2f\", $dur/$MAX}"))"
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fi
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VF="${SPEED_VF}scale=-2:720:flags=lanczos"
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echo " -> $NAME.webm"
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ffmpeg -y -loglevel error -i "$IN" -an -vf "$VF" \
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-c:v libvpx-vp9 -b:v 0 -crf 34 -row-mt 1 -deadline good -cpu-used 2 \
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-pix_fmt yuv420p "$OUT_DIR/$NAME.webm"
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echo " -> $NAME.mp4"
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ffmpeg -y -loglevel error -i "$IN" -an -vf "$VF" \
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-c:v libx264 -crf 25 -preset slow -pix_fmt yuv420p \
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-movflags +faststart "$OUT_DIR/$NAME.mp4"
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ls -lh "$OUT_DIR/$NAME.webm" "$OUT_DIR/$NAME.mp4" | awk '{print " "$5"\t"$9}'
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