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 cat month x <<<"$dir"
  15   listing=
  16   test -f "$dir" || listing=1
  17   if test -n "$listing"
  18   then
  19     test -n "$year" || exec "$0" "$user"/2*/src/*/
  20     test -n "$month" || exec "$0" "$user"/"$year"/src/*/
  21     pushd "$user/$year" >/dev/null
  22     test -d src/"$month" || { popd; continue; }
  23   else
  24     pushd "$user/$year" >/dev/null
  25   fi
  26   if test -n "$listing"
  27   then (cd src; find -L "$month" -type f -size +100M -printf '%f %p\n') | sort -t/ -k1.5 | cut -f2 -d ' '
  28   else printf '%s\n' "${dir#"$user/$year/$cat/"}"
  29   fi |
  30   while read -r src; do
  31     echo >&2 "$dir: processing $user/$year/src/$src"
  32     base=${src%.*}
  33     name=${base#*/}
  34     id=${name%%.*}
  35     mkdir -p {{tmp,wip}/reencode,old}/"${base%/*}"
  36     need_psize () {
  37       # Slow, but needed to make wide videos span two columns of the CSS grid
  38       IFS=' ' read -r width height rotation <<<"$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height:stream_side_data=rotation -of csv=p=0:s='\ ' src/"$src")"
  39       case "$rotation" in
  40         (90|-90) w=$width; width=$height; height=$w;;
  41       esac
  42       if [ "$width" -gt "$height" ]
  43       then psize=$height
  44       else psize=$width
  45       fi
  46     }
  47     case "$src" in
  48       *.mp4|*.MOV)
  49         need_psize
  50         case $psize in
  51           480) crf=30;;
  52           720) crf=40;;
  53           1080) crf=50;;
  54           *) exit 3;;
  55         esac
  56         preset=5
  57         ext="preset=$preset.crf=$crf.av1.webm"
  58         need_opus () {
  59           test tmp/reencode/"$base".opus -nt src/"$src" || {
  60             ffmpeg_ -i src/"$src" \
  61               -map 0:a -c:a libopus -b:a 64k -application voip \
  62               wip/reencode/"$base".opus
  63             mv_ {wip,tmp}/reencode/"$base".opus
  64           }
  65         }
  66         test src/"$base.$ext" -nt src/"$src" || {
  67           need_opus
  68           ffmpeg_ -i src/"$src" -i tmp/reencode/"$base".opus \
  69             -map 0:v \
  70               -filter:v format=yuv420p \
  71               -c:v libsvtav1 -preset "$preset" -crf "$crf" \
  72                 -svtav1-params input-depth=8:keyint=10s:enable-overlays=1:enable-tf=0:scd=1:scm=0:tune=0:fast-decode=1 \
  73             -map 1:a -c:a copy \
  74             wip/reencode/"$base.$ext"
  75           mv_ {wip/reencode,src}/"$base.$ext"
  76           mv_ {src,old}/"$src"
  77         }
  78         ;;
  79     esac
  80   done
  81   rm -vrf {tmp,wip}/reencode
  82   popd >/dev/null
  83 done