129 lines
7.6 KiB
Bash
Executable File
129 lines
7.6 KiB
Bash
Executable File
#!/bin/bash
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# Normalize every finished original so editors always get the same kind of file:
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# MP4 · H.264 8-bit 4:2:0 · constant frame rate · AAC audio · index up front · ≤2560x1440 · ≤60 fps
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# - compliant files: untouched
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# - fragmented/unindexed MP4 (MediaMTX output) with good codecs: lossless remux, replaced in place
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# - anything else (HEVC, 10-bit, VFR, MKV, >1440p, >60fps): full-res re-encode -> name.mp4,
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# raw source kept in a hidden .src/ subfolder next to it (Jellyfin/copyparty hide dot-dirs)
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# - Syncthing folders (marker dir .stfolder in the folder root, receive-only): compliant files are left
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# alone (zero copies); a non-compliant file is converted to name.mp4 (name.h264.mp4 if the raw is
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# already .mp4), the raw's name is appended to .stlocal (an #include'd ignore list) so Syncthing
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# drops it without flagging or re-pulling, then the raw is deleted. One copy on the server.
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# - failure: name.normalize-failed.log is written and the file is skipped until that log is deleted
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# Idempotent; safe every few minutes.
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set -uo pipefail
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ROOT="${MEDIA_ROOT:-/srv/media}"
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MINS_IDLE=3
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MAX_W=2560; MAX_H=1440; MAX_FPS=60
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exec 9>"${LOCK_FILE:-/run/lock/normalize-sweep.lock}"
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flock -n 9 || exit 0
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log() { echo "$(date '+%F %T') $*"; }
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dur() { ffprobe -v error -show_entries format=duration -of csv=p=0 "$1" 2>/dev/null | cut -d. -f1; }
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# --- probe: prints "verdict reason" where verdict ∈ ok|remux|encode|skip ----------------------
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probe() {
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local f="$1" ext="${1##*.}"
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local json; json=$(ffprobe -v error -show_entries stream=codec_type,codec_name,pix_fmt,width,height,r_frame_rate,avg_frame_rate -of json "$f" 2>/dev/null) || { echo "skip unreadable"; return; }
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local vcodec pix w h rfr afr acodecs
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vcodec=$(jq -r '[.streams[]|select(.codec_type=="video")][0].codec_name // "none"' <<<"$json")
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pix=$(jq -r '[.streams[]|select(.codec_type=="video")][0].pix_fmt // ""' <<<"$json")
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w=$(jq -r '[.streams[]|select(.codec_type=="video")][0].width // 0' <<<"$json")
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h=$(jq -r '[.streams[]|select(.codec_type=="video")][0].height // 0' <<<"$json")
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rfr=$(jq -r '[.streams[]|select(.codec_type=="video")][0].r_frame_rate // "0/1"' <<<"$json")
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afr=$(jq -r '[.streams[]|select(.codec_type=="video")][0].avg_frame_rate // "0/1"' <<<"$json")
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acodecs=$(jq -r '[.streams[]|select(.codec_type=="audio")|.codec_name]|unique|join(",")' <<<"$json")
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[[ $vcodec == none ]] && { echo "skip no-video"; return; }
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local fps; fps=$(awk -F/ '{ if ($2>0) printf "%.3f", $1/$2; else print 0 }' <<<"$afr")
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local reasons=()
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[[ $vcodec == h264 ]] || reasons+=("codec=$vcodec")
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[[ $pix == yuv420p ]] || reasons+=("pix=$pix")
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(( w <= MAX_W && h <= MAX_H )) || reasons+=("size=${w}x${h}")
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awk "BEGIN{exit !($fps > $MAX_FPS + 0.01)}" && reasons+=("fps=$fps")
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[[ -z $acodecs || $acodecs == aac ]] || reasons+=("audio=$acodecs")
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[[ ${ext,,} == mp4 ]] || reasons+=("container=$ext")
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if (( ${#reasons[@]} )); then echo "encode ${reasons[*]}"; return; fi
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# codecs fine. Fragmented MP4 (MediaMTX output) -> lossless remux. ffprobe's frame-rate figures are
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# meaningless on fragmented files, so the VFR check only runs on flat files (i.e. after the remux).
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local head; head=$(head -c 2097152 "$f" | grep -aob -m3 -E 'moov|mdat|moof' | tr '\n' ' ')
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if grep -q moof <<<"$head"; then echo "remux fragmented"; return; fi
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# real VFR test: do the gaps between the first ~400 frames vary? (dts is monotonic even with B-frames)
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local vfr; vfr=$(ffprobe -v error -select_streams v:0 -show_entries packet=dts_time -of csv=p=0 -read_intervals '%+#400' "$f" 2>/dev/null |
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awk 'NF && $1!="N/A" { if (p!="") d[n++]=$1-p; p=$1 }
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END { if (n<20) { print "cfr"; exit }
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for(i=0;i<n;i++) a[i]=d[i]; asort(a); med=a[int(n/2)]; if (med<=0) { print "cfr"; exit }
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bad=0; for(i=0;i<n;i++){ x=d[i]-med; if(x<0)x=-x; if (x > med*0.25) bad++ }
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print (bad > n*0.02) ? "vfr" : "cfr" }')
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[[ $vfr == vfr ]] && { echo "encode vfr"; return; }
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local moov mdat; moov=$(grep -o '[0-9]*:moov' <<<"$head" | cut -d: -f1 | head -1); mdat=$(grep -o '[0-9]*:mdat' <<<"$head" | cut -d: -f1 | head -1)
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if [[ -z $moov || ( -n $mdat && $mdat -lt $moov ) ]]; then echo "remux index-last"; return; fi
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echo "ok"
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}
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find "$ROOT/streams" "$ROOT/clips" -type f \
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\( -iname '*.mp4' -o -iname '*.mkv' -o -iname '*.mov' -o -iname '*.ts' -o -iname '*.m4v' -o -iname '*.webm' \) \
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! -path '*/.src/*' ! -path '*/.stfolder/*' ! -path '*/.stversions/*' ! -name '*.part' -mmin +"$MINS_IDLE" -print0 2>/dev/null |
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while IFS= read -r -d '' src; do
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base="${src%.*}"; ext="${src##*.}"
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synced=0; stroot=""
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d="$(dirname "$src")"
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while [[ $d == "$ROOT"/* ]]; do # find the Syncthing folder root, if any
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if [[ -d "$d/.stfolder" ]]; then synced=1; stroot="$d"; break; fi
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d="$(dirname "$d")"
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done
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[[ -e "$base.normalize-failed.log" ]] && continue
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fuser -s "$src" 2>/dev/null && continue # still being written
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[[ -e "$src" ]] || continue # dumped meanwhile
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read -r verdict reason <<<"$(probe "$src")"
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case "$verdict" in ok|skip) continue ;; esac
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out="$base.mp4"
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if (( synced )); then
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[[ $verdict == remux ]] && continue # synced + only an index issue: not worth touching
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[[ ${ext,,} == mp4 ]] && out="$base.h264.mp4" # raw is already name.mp4: don't collide
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[[ -e "$out" ]] && continue
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fi
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tmp="$out.part"
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log "$verdict $src ($reason)"
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if [[ $verdict == remux ]]; then
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nice -n 15 ionice -c 3 ffmpeg -nostdin -hide_banner -loglevel error -y -i "$src" \
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-map 0 -c copy -movflags +faststart -f mp4 "$tmp"
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else
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# scale down into the cap (never up), keep aspect, even dimensions; cap fps; CFR; all audio -> AAC
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vf="scale='min(iw,$MAX_W)':'min(ih,$MAX_H)':force_original_aspect_ratio=decrease:force_divisible_by=2"
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fpsargs=(); fpsnow=$(awk -F/ '{ if ($2>0) printf "%.3f", $1/$2; else print 0 }' <<<"$(ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of csv=p=0 "$src")")
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awk "BEGIN{exit !($fpsnow > $MAX_FPS + 0.01)}" && fpsargs=(-r "$MAX_FPS")
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nice -n 15 ionice -c 3 ffmpeg -nostdin -hide_banner -loglevel error -y -i "$src" \
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-map 0:v:0 -map '0:a?' \
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-c:v libx264 -preset veryfast -crf 18 -maxrate 30M -bufsize 60M -pix_fmt yuv420p -profile:v high \
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-vf "$vf" -fps_mode cfr "${fpsargs[@]}" \
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-c:a aac -b:a 160k \
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-movflags +faststart -f mp4 "$tmp"
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fi
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rc=$?
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d1=$(dur "$src"); d2=$(dur "$tmp")
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if (( rc == 0 )) && [[ -n $d1 && -n $d2 ]] && (( d2 >= d1 - 2 && d2 <= d1 + 2 )); then
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if (( synced )); then
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rel_src="${src#"$stroot"/}"; rel_out="${out#"$stroot"/}"
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{ echo "/$rel_out"; echo "/$rel_src"; } >> "$stroot/.stlocal" # ignore our output and the raw
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chown 1000:1000 "$stroot/.stlocal" 2>/dev/null
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sleep 2 # let Syncthing re-read ignores before the delete
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mv -f "$tmp" "$out"
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rm -f "$src" # raw stays on the gamer's PC; one copy here
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elif [[ $verdict == remux ]]; then
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mv -f "$tmp" "$src" # lossless: replace in place
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else
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srcdir="$(dirname "$src")/.src"; mkdir -p "$srcdir"; chown 1000:1000 "$srcdir" 2>/dev/null
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mv -f "$src" "$srcdir/$(basename "$src")" # keep raw source, hidden from editors/Jellyfin
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mv -f "$tmp" "$out"
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fi
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chown 1000:1000 "$out" 2>/dev/null
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log "done $out"
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else
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rm -f "$tmp"
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{ echo "$(date '+%F %T') $verdict failed rc=$rc src_dur=${d1:-?} out_dur=${d2:-?} ($reason)"; } > "$base.normalize-failed.log"
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log "FAILED $src (see $base.normalize-failed.log)" >&2
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fi
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done
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