limit thumb quality for faster page load

[serve0] / helpers / genthumb.sh

diff --git a/helpers/genthumb.sh b/helpers/genthumb.sh
index 30179b614afbb9a87d3a165f0fdfe009bc31f138..2119d85dabf247885e468900012084b67322ac0b 100755 (executable)
--- a/helpers/genthumb.sh
+++ b/helpers/genthumb.sh
@@ -1,33 +1,44 @@
 #!/bin/zsh
+# Copyright 2014 - 2017 Paul Hänsch
+#
+# This file is part of Serve0
+#
+# Serve0 is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Serve0 is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with Serve0  If not, see <http://www.gnu.org/licenses/>.
 
 video="$1"
 thumb="$2"
-exec >/dev/null 2>/dev/null
 
-mplayer -really-quiet -identify -frames 0 -nosound -vo null "$video" \
-| sed -rn 's:ID_VIDEO_WIDTH=(.*):\1:p;
-           s:ID_VIDEO_HEIGHT=(.*):\1:p;
-           s:ID_LENGTH=(.*)(\..*)$:\1:p;' \
-| tr '\n' ' ' \
-| read width height length
-
-[ -z "$length" -o -z "$width" -o -z "$height" ] && exit 0
-
-[ "$(($height*1000/$width))" -gt "750" ] && width="$((75*$width/$height))" \
-                                         || width=100
-[ -z $width ] && width=100
-chunk="$(($length / 5))"
-
-tmp="$(mktemp -d)"
-
-for cnt in 1 2 3 4; do
-  mplayer -nosound -vo jpeg:outdir="$tmp" -frames 1 -benchmark -vf framestep=I,scale="$width":-2 -ss "$(($cnt*$chunk))" "$video" &
-  mpid="$!"; for watch in {1..10}; do
-    ps -p "$mpid" && sleep 1
+if [ -e "$video" -a \! -e "$thumb" ]; then
+  printf '' |mplayer -input nodefault-bindings -nosound -vo null -frames 0 -identify "$video" \
+  | sort \
+  | sed -rn 's:^.*ID_LENGTH=(.*)(\..*)$:\1:p;
+             s:^.*ID_VIDEO_HEIGHT=(.*)$:\1:p;
+             s:^.*ID_VIDEO_WIDTH=(.*)$:\1:p;' \
+  | tr '\n' ' ' \
+  | read length height width 2>/dev/null
+  
+  [ "$(($height * 1000 / $width))" -gt "750" ] && width="$((75 * $width / $height))" \
+                                           || width=100
+  [ -z $width ] && width=100
+  chunk="$((${length:-0} / 5))"
+  
+  tmp="$(mktemp -d)"
+  for cnt in 1 2 3 4; do
+    printf '' |mplayer -input nodefault-bindings -nosound -vo jpeg:outdir="$tmp" -frames 1 \
+             -benchmark -vf framestep=I,scale="$width":-2 -ss "$(($cnt*$chunk))" "$video" >/dev/null 2>/dev/null
+    mv "$tmp/00000001.jpg" "${tmp}/_${cnt}.jpg"
   done
-  ps -p "$mpid" && kill -9 "$mpid"
-  mv "$tmp/00000001.jpg" "${tmp}/${thumb}-${cnt}.jpg"
-done
-montage "${tmp}/${thumb}"-[1234].jpg -tile 2x2+0+0 -geometry 100x75+3+3 -background '#000000' "${thumb}"
-rm -r "${tmp}"
-
+  montage "${tmp}"/_[1234].jpg -tile 2x2+0+0 -geometry 100x75+3+3 -background '#000000' -quality 50 "${thumb}" 2>/dev/null
+  rm -r "${tmp}"
+fi