From 2168a8de63aa52ea4d031b766bd8dd662c00a279 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Sat, 2 Oct 2021 22:24:04 +0200
Subject: [PATCH] grab thumbnails by fast seeking

---
 page_video.sh | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/page_video.sh b/page_video.sh
index 0a1f275..6d3a8eb 100644
--- a/page_video.sh
+++ b/page_video.sh
@@ -23,7 +23,7 @@ update_video(){
         hits descr_cache futureuse
   local ID NAME DESCRIPTION RESX RESY LENGTH COVER STATUS UPLOADER HITS \
         DESCR_CACHE FUTUREUSE
-  local arg video thumb
+  local arg video thumb cnt
   video="${_DATA}/${CHANNEL_ID}/${VIDEO_ID}.mp4"
   thumb="${_DATA}/${CHANNEL_ID}/${VIDEO_ID}_thumb.jpg"
 
@@ -42,11 +42,17 @@ update_video(){
     resy="${arg#*height=}"; resy="${resy%%${BR}*}"
     length="${arg#*duration=}"; length="${length%%${BR}*}"
   fi
-  if [ "$length" -a ! "${thumb}" -nt "${video}" ]; then
-    ffmpeg -nostdin -y -i "$video" -vf scale=320:-2,fps=10/${length} "${thumb%.jpg}_%02d.jpg"
-    montage "${thumb%.jpg}_"[01][0-9].jpg -tile 10x1 -geometry 320x180+0+0 -quality 85 "${thumb}"
-    rm -- "${thumb%.jpg}_"[01][0-9].jpg
-  fi 2>&-
+  if [ "${length%.*}" -a ! "${thumb}" -nt "${video}" ]; then
+    for cnt in 1 2 3 4 5 6 7 8 9 10; do
+      ffmpeg -nostdin -y -ss "$((cnt * ${length%.*} / 11))" -i "$video" \
+             -frames 1 "${thumb%.jpg}_$((cnt - 1)).jpg"
+    done 2>&-
+    montage "${thumb%.jpg}"_[0-9].jpg \
+            -background "#000000" \
+            -tile 10x1 -geometry 320x180+0+0 \
+            -interlace line -quality 85 "${thumb}"
+    rm -- "${thumb%.jpg}"_[0-9].jpg
+  fi
 
   if LOCK "$vid_db"; then
     while read -r ID NAME DESCRIPTION RESX RESY LENGTH COVER STATUS UPLOADER HITS \
-- 
2.39.2