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Diffstat (limited to 'tools/lg/build_video.sh')
| -rwxr-xr-x | tools/lg/build_video.sh | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/tools/lg/build_video.sh b/tools/lg/build_video.sh new file mode 100755 index 0000000..4f80be8 --- /dev/null +++ b/tools/lg/build_video.sh @@ -0,0 +1,143 @@ +#!/bin/bash +# SPDX-License-Identifier: BSD-3-Clause +# build_video.sh - build the final open-iov 1.0.0 demo video: a drawtext +# title card, the split-screen main segment (two GZDOOM VMs, one per pane, +# captured through the KVMFR ivshmem path), and an optional end card, +# concatenated into one 1280x720@30 libx264 yuv420p mp4. +# +# Usage: +# build_video.sh <title-text> <main.mp4> [end-text] +# build_video.sh <title-text> <dirA> <dirB> [end-text] +# title-text text for the title card (required, non-empty) +# main.mp4 pre-built split-screen video (e.g. from split_screen.sh) +# dirA dirB two frame-%04d.ppm dirs; split_screen.sh (next to this +# script) is invoked first at FPS to build the main segment +# end-text optional text for the end card (omitted = no end card) +# +# Output: $OUT if set, else ./open-iov-1.0.0-demo.mp4 in the current dir. +# Env knobs: FPS (default 30), CARD_SECS (default 5), FONTSIZE (default 48). +# +# Approach: title/end cards are generated with ffmpeg drawtext (white on +# dark 0x101010, 1280x720); the main segment is normalized to 1280x720@30 +# (aspect-preserving fit + letterbox pad, audio dropped - the demo video is +# video-only); the three segments are concatenated with the concat demuxer +# followed by ONE re-encode. Stream-copy concat is brittle across +# separately-generated mp4s (timestamp/param mismatches); the re-encode is +# cheap at these lengths and guarantees a clean single-stream output. +# The title font is auto-detected (DejaVuSans/NotoSans); the script fails +# with a clear message if no TTF font exists. +# +# Requires: ffmpeg with libx264 + drawtext (libfreetype); split_screen.sh +# next to this script for the two-dirs form. +set -euo pipefail + +usage() { + sed -n '3,31p' "$0" | sed 's/^# \{0,1\}//' +} + +die() { echo "build_video.sh: ERROR: $*" >&2; exit 1; } + +# grep -q would SIGPIPE the ffmpeg producer under pipefail; capture first. +ffmpeg_has() { # $1 = encoder/filter token + local out + out=$(ffmpeg -hide_banner "$2" 2>/dev/null) || true + case "$out" in *" $1 "*) return 0 ;; *) return 1 ;; esac +} + +command -v ffmpeg >/dev/null 2>&1 || die "ffmpeg not found in PATH" +ffmpeg_has libx264 -encoders || die "ffmpeg has no libx264 encoder" +ffmpeg_has drawtext -filters || die "ffmpeg has no drawtext filter (needs libfreetype)" + +# --- locate a usable TTF font ------------------------------------------- +FONT="" +for f in \ + /usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf \ + /usr/share/fonts/truetype/dejavu/DejaVuSans.ttf \ + /usr/share/fonts/truetype/noto/NotoSans-Regular.ttf \ + /usr/share/fonts/dejavu/DejaVuSans.ttf; do + if [ -f "$f" ]; then FONT=$f; break; fi +done +if [ -z "$FONT" ] && command -v fc-match >/dev/null 2>&1; then + f=$(fc-match -f '%{file}' sans 2>/dev/null || true) + [ -n "$f" ] && [ -f "$f" ] && FONT=$f +fi +[ -n "$FONT" ] || die "no usable TTF font found (looked for DejaVuSans, NotoSans; \ +install fonts-dejavu-core or set up fontconfig)" +echo "build_video.sh: font=$FONT" >&2 + +# --- args ---------------------------------------------------------------- +[ "$#" -ge 1 ] || { usage; exit 2; } +TITLE=$1; shift +[ -n "$TITLE" ] || die "title text must be non-empty" +MAIN="" DIR_A="" DIR_B="" END="" +if [ "$#" -ge 1 ] && [ -d "$1" ]; then + DIR_A=$1 + [ "$#" -ge 2 ] && [ -d "$2" ] || die "two-dirs form needs two directories: <dirA> <dirB> [end-text]" + DIR_B=$2 + END=${3:-} +elif [ "$#" -ge 1 ]; then + [ -f "$1" ] || die "main input not found: $1" + MAIN=$1 + END=${2:-} +else + die "missing main input (mp4 file or two frame dirs)" +fi + +FPS=${FPS:-30} +CARD_SECS=${CARD_SECS:-5} +FONTSIZE=${FONTSIZE:-48} +OUT=${OUT:-$PWD/open-iov-1.0.0-demo.mp4} +HERE=$(cd "$(dirname "$0")" && pwd) + +TMP=$(mktemp -d "${TMPDIR:-/tmp}/build_video.XXXXXX") +trap 'rm -rf "$TMP"' EXIT + +# --- cards (drawtext; text via textfile so ':' ',' '%' etc. are literal) -- +make_card() { + local text=$1 out=$2 tf="$TMP/card-$$.txt" + printf '%s' "$text" > "$tf" + ffmpeg -hide_banner -loglevel warning -y \ + -f lavfi -i "color=c=0x101010:s=1280x720:r=$FPS:d=$CARD_SECS" \ + -vf "drawtext=fontfile=$FONT:textfile=$tf:fontcolor=white:fontsize=$FONTSIZE:expansion=none:x=(w-text_w)/2:y=(h-text_h)/2" \ + -c:v libx264 -preset medium -crf 20 -pix_fmt yuv420p \ + "$out" +} + +echo "build_video.sh: title card (${CARD_SECS}s)..." >&2 +make_card "$TITLE" "$TMP/title.mp4" + +# --- main segment -------------------------------------------------------- +if [ -n "$DIR_A" ]; then + [ -x "$HERE/split_screen.sh" ] || die "split_screen.sh not found/executable next to build_video.sh" + echo "build_video.sh: building split-screen main from $DIR_A + $DIR_B..." >&2 + "$HERE/split_screen.sh" "$DIR_A" "$DIR_B" "$TMP/split.mp4" "$FPS" + MAIN=$TMP/split.mp4 +fi +echo "build_video.sh: normalizing main segment to 1280x720@$FPS..." >&2 +ffmpeg -hide_banner -loglevel warning -y -i "$MAIN" \ + -vf "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2,setsar=1,fps=$FPS" \ + -an -c:v libx264 -preset medium -crf 20 -pix_fmt yuv420p \ + "$TMP/main.mp4" + +# --- concat [title, main, end] ------------------------------------------ +printf "file '%s'\n" "$TMP/title.mp4" "$TMP/main.mp4" > "$TMP/list.txt" +if [ -n "$END" ]; then + echo "build_video.sh: end card (${CARD_SECS}s)..." >&2 + make_card "$END" "$TMP/end.mp4" + printf "file '%s'\n" "$TMP/end.mp4" >> "$TMP/list.txt" +fi + +echo "build_video.sh: concatenating..." >&2 +ffmpeg -hide_banner -loglevel warning -y -f concat -safe 0 -i "$TMP/list.txt" \ + -c:v libx264 -preset medium -crf 20 -pix_fmt yuv420p \ + -r "$FPS" -movflags +faststart \ + "$OUT" + +[ -s "$OUT" ] || die "ffmpeg produced no output: $OUT" +if command -v ffprobe >/dev/null 2>&1; then + ffprobe -v error -select_streams v:0 \ + -show_entries stream=width,height,r_frame_rate,duration \ + -show_entries format=duration,size \ + -of default=nw=1 "$OUT" | sed 's/^/build_video.sh: /' >&2 +fi +echo "VIDEO_DONE $OUT" >&2 |