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 rotation <<<"$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height:stream_side_data=rotation -of csv=p=0:s='\ ' src/"$src")"
  29       case "$rotation" in
  30         (90|-90) w=$width; width=$height; height=$w;;
  31       esac
  32       if [ "$width" -gt "$height" ]
  33       then psize=$height
  34       else psize=$width
  35       fi
  36     }
  37     case "$src" in
  38       *.mp4|*.MOV)
  39         need_psize
  40         case $psize in
  41           480) crf=30;;
  42           720) crf=40;;
  43           1080) crf=50;;
  44           *) exit 3;;
  45         esac
  46         preset=5
  47         ext="preset=$preset.crf=$crf.av1.webm"
  48         need_opus () {
  49           test tmp/reencode/"$base".opus -nt src/"$src" || {
  50             ffmpeg_ -i src/"$src" \
  51               -map 0:a -c:a libopus -b:a 64k -application voip \
  52               wip/reencode/"$base".opus
  53             mv_ {wip,tmp}/reencode/"$base".opus
  54           }
  55         }
  56         test src/"$base.$ext" -nt src/"$src" || {
  57           need_opus
  58           ffmpeg_ -i src/"$src" -i tmp/reencode/"$base".opus \
  59             -map 0:v \
  60               -filter:v format=yuv420p \
  61               -c:v libsvtav1 -preset "$preset" -crf "$crf" \
  62                 -svtav1-params input-depth=8:keyint=10s:enable-overlays=1:enable-tf=0:scd=1:scm=0:tune=0:fast-decode=1 \
  63             -map 1:a -c:a copy \
  64             wip/reencode/"$base.$ext"
  65           mv_ {wip/reencode,src}/"$base.$ext"
  66           mv_ {src,old}/"$src"
  67         }
  68         ;;
  69     esac
  70   done
  71   rm -vrf {tmp,wip}/reencode
  72   popd >/dev/null
  73 done