arest · September 2, 2018 09:10 · Sep 21, 2016 · May 1, 2016 · May 1, 2016 · May 1, 2016
diff --git a/make_crossfade_ffmpeg_video_from_images.sh b/make_crossfade_ffmpeg_video_from_images.sh
@@ -7,6 +7,24 @@
 # This script takes in images from a folder and make a crossfade video from the images using ffmpeg.
 # Make sure you have ffmpeg installed before running.
 
+# The output command looks something like the below, but for as many images as you have in the folder.
+# See the answer by LordNeckbeard at:
+# http://superuser.com/questions/833232/create-video-with-5-images-with-fadein-out-effect-in-ffmpeg/1071748#1071748
+#
+#
+# ffmpeg \
+# -loop 1 -t 1 -i 001.png \
+# -loop 1 -t 1 -i 002.png \
+# -loop 1 -t 1 -i 003.png \
+# -loop 1 -t 1 -i 004.png \
+# -loop 1 -t 1 -i 005.png \
+# -filter_complex \
+# "[1:v][0:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b1v]; \
+# [2:v][1:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b2v]; \
+# [3:v][2:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b3v]; \
+# [4:v][3:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b4v]; \
+# [0:v][b1v][1:v][b2v][2:v][b3v][3:v][b4v][4:v]concat=n=9:v=1:a=0,format=yuv420p[v]" -map "[v]" out.mp4
+
 #----------------------------------------------------------------
 # SETTINGS
 input_dir="/path/to/your/folder"  # Replace this by a path to your folder /path/to/your/folder

diff --git a/make_crossfade_ffmpeg_video_from_images.sh b/make_crossfade_ffmpeg_video_from_images.sh
@@ -5,14 +5,15 @@
 # MIT License
 
 # This script takes in images from a folder and make a crossfade video from the images using ffmpeg.
-# Crossfade between each pair of images is 0.5 seconds.
 # Make sure you have ffmpeg installed before running.
 
 #----------------------------------------------------------------
 # SETTINGS
 input_dir="/path/to/your/folder"  # Replace this by a path to your folder /path/to/your/folder
 n_files=10                        # Replace this by a number of images
 files=`ls ${input_dir}/*.jpg | head -${n_files}`  # Change the file type to the correct type of your images
+output_file="video.mp4"           # Name of output video
+crossfade=0.9                     # Crossfade duration between two images
 #----------------------------------------------------------------
 
 # Making an ffmpeg script...
@@ -27,7 +28,7 @@ for f in ${files}; do
 
   next=$((i+1))
   if [ "${i}" -ne "$((n_files-1))" ]; then
-    filters+=" [${next}:v][${i}:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b${next}v];"
+    filters+=" [${next}:v][${i}:v]blend=all_expr='A*(if(gte(T,${crossfade}),1,T/${crossfade}))+B*(1-(if(gte(T,${crossfade}),1,T/${crossfade})))'[b${next}v];"
   fi
 
   if [ "${i}" -gt "0" ]; then
@@ -37,7 +38,7 @@ for f in ${files}; do
   i=$((i+1))
 done
 
-output+="concat=n=$((i * 2 - 1)):v=1:a=0,format=yuv420p[v]\" -map \"[v]\" out.mp4"
+output+="concat=n=$((i * 2 - 1)):v=1:a=0,format=yuv420p[v]\" -map \"[v]\" ${output_file}"
 
 script="ffmpeg ${input} -filter_complex \"${filters} ${output}"
 

diff --git a/make_crossfade_ffmpeg_video_from_images.sh b/make_crossfade_ffmpeg_video_from_images.sh
@@ -4,8 +4,9 @@
 # 2016-04-30
 # MIT License
 
-# This script takes in images from a folder and make a crossfade video from the images.
-# Crossfade between each pair of images is 0.5 seconds
+# This script takes in images from a folder and make a crossfade video from the images using ffmpeg.
+# Crossfade between each pair of images is 0.5 seconds.
+# Make sure you have ffmpeg installed before running.
 
 #----------------------------------------------------------------
 # SETTINGS

diff --git a/make_crossfade_ffmpeg_video_from_images.sh b/make_crossfade_ffmpeg_video_from_images.sh
@@ -9,9 +9,9 @@
 
 #----------------------------------------------------------------
 # SETTINGS
-input_dir="accuracy_in_frames"
-n_files=10
-files=`ls ${input_dir}/*.jpg | head -${n_files}`
+input_dir="/path/to/your/folder"  # Replace this by a path to your folder /path/to/your/folder
+n_files=10                        # Replace this by a number of images
+files=`ls ${input_dir}/*.jpg | head -${n_files}`  # Change the file type to the correct type of your images
 #----------------------------------------------------------------
 
 # Making an ffmpeg script...

diff --git a/make_crossfade_ffmpeg_video_from_images.sh b/make_crossfade_ffmpeg_video_from_images.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# Anh Nguyen <[email protected]>
+# 2016-04-30
+# MIT License
+
+# This script takes in images from a folder and make a crossfade video from the images.
+# Crossfade between each pair of images is 0.5 seconds
+
+#----------------------------------------------------------------
+# SETTINGS
+input_dir="accuracy_in_frames"
+n_files=10
+files=`ls ${input_dir}/*.jpg | head -${n_files}`
+#----------------------------------------------------------------
+
+# Making an ffmpeg script...
+input=""
+filters=""
+output="[0:v]"
+
+i=0
+
+for f in ${files}; do
+  input+=" -loop 1 -t 1 -i $f"
+
+  next=$((i+1))
+  if [ "${i}" -ne "$((n_files-1))" ]; then
+    filters+=" [${next}:v][${i}:v]blend=all_expr='A*(if(gte(T,0.5),1,T/0.5))+B*(1-(if(gte(T,0.5),1,T/0.5)))'[b${next}v];"
+  fi
+
+  if [ "${i}" -gt "0" ]; then
+    output+="[b${i}v][${i}:v]"
+  fi
+
+  i=$((i+1))
+done
+
+output+="concat=n=$((i * 2 - 1)):v=1:a=0,format=yuv420p[v]\" -map \"[v]\" out.mp4"
+
+script="ffmpeg ${input} -filter_complex \"${filters} ${output}"
+
+echo ${script}
+
+# Run it
+eval "${script}"
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