From 1e448d2e99ff47b17d03aa5979d893b425ee7ab1 Mon Sep 17 00:00:00 2001
From: Leo Vivier <zaeph@zaeph.net>
Date: Fri, 2 Dec 2022 08:25:48 +0100
Subject: Add prototype for limiting fps
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Problem: doesn’t update the fps metadata info; needs another pass.
---
 roles/prerec/templates/reencode.sh | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

(limited to 'roles/prerec')

diff --git a/roles/prerec/templates/reencode.sh b/roles/prerec/templates/reencode.sh
index 7ae3234..66c2f57 100755
--- a/roles/prerec/templates/reencode.sh
+++ b/roles/prerec/templates/reencode.sh
@@ -7,7 +7,8 @@ q=32
 cpu=4
 time_limit=""
 print_only=false
-resolution=1080
+limit_resolution=1080
+limit_fps=30.01
 
 while getopts :q:c:t:s OPT; do
     case $OPT in
@@ -32,8 +33,18 @@ shift `expr $OPTIND - 1`
 OPTIND=1
 
 command="$(cat<<EOF
-ffmpeg -y -i "$1" $time_limit -vf "scale='-1':'min($resolution,ih)'" -c:v libvpx-vp9 -b:v 0 -crf $q -an -row-mt 1 -tile-columns 2 -tile-rows 2 -cpu-used $cpu -g 240 -pass 1 -f webm -threads $cpu /dev/null &&
-    ffmpeg -y -i "$1" $time_limit -vf "scale='-1':'min($resolution,ih)'" -c:v libvpx-vp9 -b:v 0 -crf $q -c:a libopus -row-mt 1 -tile-columns 2 -tile-rows 2 -cpu-used $cpu -pass 2 -g 240 -threads $cpu "$2"
+ffmpeg -y -i "$1" $time_limit \
+       -vf "scale='-1':'min($limit_resolution,ih)',
+            select='eq(n,0)+if(gt(t-prev_selected_t,1/$limit_fps),1,0)'" \
+       -c:v libvpx-vp9 -b:v 0 -crf $q -an \
+       -row-mt 1 -tile-columns 2 -tile-rows 2 -cpu-used $cpu -g 240 \
+       -pass 1 -f webm -threads $cpu /dev/null &&
+    ffmpeg -y -i "$1" $time_limit \
+           -vf "scale='-1':'min($limit_resolution,ih)',
+                select='eq(n,0)+if(gt(t-prev_selected_t,1/$limit_fps),1,0)'" \
+           -c:v libvpx-vp9 -b:v 0 -crf $q -c:a libopus \
+           -row-mt 1 -tile-columns 2 -tile-rows 2 -cpu-used $cpu \
+           -pass 2 -threads $cpu "$2"
 EOF
 )"
 
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