reencode.sh

   1 #!/usr/bin/env bash
   2 # Copyright: Julien Moutinho <julm+camera@sourcephile.fr>
   3 # License: AGPL-3.0-or-later
   4 #
   5
   6 cd "${0%/*}"
   7 set -eu
   8 shopt -s nullglob
   9
  10 ffmpeg_ () { local -; set -x; nice -19 time ffmpeg </dev/null -hide_banner -loglevel warning -stats -y "$@"; }
  11 mv_ () { local -; mv -i >&2 "$@"; }
  12 set -x
  13 for dir in "$@"; do
  14   IFS=/ read -r user year x month x <<<"$dir"
  15   test -n "$year" || exec "$0" "$user"/2*/src/*/
  16   test -n "$month" || exec "$0" "$user"/"$year"/src/*/
  17   pushd "$user/$year" >/dev/null
  18   test -d src/"$month" || { popd; continue; }
  19   (cd src; find -L "$month" -type f -size +180M -printf '%f %p\n') | sort -t/ -k1.5 | cut -f2 -d ' ' |
  20   while read -r src; do
  21     echo >&2 "$dir: processing $year/src/$src"
  22     base=${src%.*}
  23     name=${base#*/}
  24     id=${name%%.*}
  25     mkdir -p {{tmp,wip}/reencode,old}/"${base%/*}"
  26     need_psize () {
  27       # Slow, but needed to make wide videos span two columns of the CSS grid
  28       IFS=' ' read -r width height <<<"$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=p=0:s='\ ' src/"$src")"
  29       if [ "$width" -gt "$height" ]
  30       then psize=$height
  31       else psize=$width
  32       fi
  33     }
  34     case "$src" in
  35       *.mp4)
  36         need_psize
  37         case $psize in
  38           480) crf=30;;
  39           720) crf=40;;
  40           1080) crf=50;;
  41           *) exit 3;;
  42         esac
  43         preset=6
  44         ext="preset=$preset.crf=$crf.av1.webm"
  45         need_opus () {
  46           test tmp/reencode/"$base".opus -nt src/"$src" || {
  47             ffmpeg_ -i src/"$src" \
  48               -map 0:a -c:a libopus -b:a 64k -application voip \
  49               wip/reencode/"$base".opus
  50             mv_ {wip,tmp}/reencode/"$base".opus
  51           }
  52         }
  53         test src/"$base.$ext" -nt src/"$src" || {
  54           need_opus
  55           ffmpeg_ -i src/"$src" -i tmp/reencode/"$base".opus \
  56             -map 0:v \
  57               -filter:v format=yuv420p \
  58               -c:v libsvtav1 -preset "$preset" -crf "$crf" \
  59                 -svtav1-params input-depth=8:keyint=10s:enable-overlays=1:enable-tf=0:scd=1:scm=0:tune=0:fast-decode=1 \
  60             -map 1:a -c:a copy \
  61             wip/reencode/"$base.$ext"
  62           mv_ {wip/reencode,src}/"$base.$ext"
  63           mv_ {src,old}/"$src"
  64         }
  65         ;;
  66     esac
  67   done
  68   rm -vrf {tmp,wip}/reencode
  69   popd >/dev/null
  70 done