[fix] add bitrate and switch to concat

makevideo.sh

@@ -2,15 +2,16 @@
 usage(){
   cat << EOF
 
- $(basename $0) -d <directory> -s <rate> -p <prefix> -v <video_dir> -s <size>
+ $(basename $0) -d <directory> -s <accelerate> -p <prefix> -v <video_dir> -s <size>
 
  ——————————————————————————————————————————————————————————————————————————————————
  Opt | Variable      | Type  | Definition                           | Default value
  ——————————————————————————————————————————————————————————————————————————————————
  -d    directory       path    Directory path of images to convert    ./pics
- -r    rate            int     Convert only 1/N images                1
+ -a    accelerate      int     Convert only 1/N images                1
  -p    prefix          str     Images filename prefix.                ''
  -v    video_dir       path    Directory path to store video file.    ./videos
+ -b    bitrate        str     Video bitrate                          1500k 
  -s    size            str     Images geometry.                       '1024x768'
  ——————————————————————————————————————————————————————————————————————————————————
 
@@ -21,26 +22,33 @@ panic(){ echo $@; exit 2;}
 
 directory="./pics"
 prefix=""
-rate="1"
+accelerate="1"
 size='1024x768'
 video_dir="./videos"
+bitrate="1500k"
 
-while getopts "hd:s:p:v:" o; do
+while getopts "a:b:d:hs:p:r:v:" o; do
   case "${o}" in
-    h)
-      usage
-    ;;
-    r)
-      rate=${OPTARG}
+    a)
+      accelerate=${OPTARG}
     ;;
     d)
       directory=${OPTARG}
     ;;
+    h)
+      usage
+    ;;
     p)
       prefix=${OPTARG}
     ;;
+    b)
+      bitrate=${OPTARG}
+    ;;
+    s)
+      size=${OPTARG}
+    ;;
     v)
-      video_dir=$( realpath ${OPTARG} 2>/dev/null )
+      video_dir=${OPTARG}
     ;;
     \?)
       panic "Unknown option at position $OPTIND. Exiting."
@@ -55,12 +63,21 @@ which ffmpeg &>/dev/null || panic "No ffmpeg found. Exiting."
 directory="$( realpath ${directory} 2>/dev/null )/"
 [ -n "${directory}" ] && [ -d "${directory}" ] || panic "'${directory}' is not a valid directory. Exiting."
 
-# Safe test prefix
-[ -n "$( ls ${directory}/${prefix}* 2>/dev/null)" ] || panic "${directory}/${prefix}\* doesn't match any file. Exiting."
+# Safe test accelerate
+[ ${accelerate} -gt 0 ] || panic "Invalid rate '${rate}'"
+
+# Safe test prefix
+let c=0
+tmpfile=$( mktemp )
+for file in ${directory}/${prefix}* ; do 
+
+    let $(( c++ ))
+    [[ $(( $c % ${accelerate} )) -eq 0 ]] || [[ $rate -eq 1 ]] && echo "file '$file'" >> $tmpfile
+
+done
+
+[ 0 -eq $c ] && panic "No file found"
 
-# Safe test rate
-[ ${rate} -gt 0 ] || panic "Invalid rate '${rate}'"
-pts=$( echo 1/$rate | bc -l )
 
 # Safe test video_dir
 video_dir="$( realpath ${video_dir} 2>/dev/null )/"
@@ -71,11 +88,11 @@ video_dir="$( realpath ${video_dir} 2>/dev/null )/"
   [ "N" == ${REPLY^^} ] && panic "The video directory must exist. Exiting."
   mkdir -p ${video_dir} 2>/dev/null || panic "Failed to create '${video_dir}'. Exiting"
 }
-[ -n "$( ls ${directory}/${prefix}* 2>/dev/null)" ] || panic "${directory}/${prefix}\* doesn't match any file. Exiting."
 
 # Set video file name
 date=$(date +%s)
 video_file="${video_dir}$date.mp4"
-echo -e "\nSaving to video file $video_file.\n"
+echo -e "\nSaving to video file $video_file\n"
 
-ffmpeg -hide_banner -loglevel quiet -stats -pattern_type glob -i "pics/*.jpg" -filter:v "setpts=(${pts})*PTS"  -pix_fmt yuv420p -s "${size}"  -vcodec libx264  "${video_file}"
+ffmpeg -hide_banner -loglevel quiet -stats -f concat -safe 0 -i "${tmpfile}" -pix_fmt yuv420p -s "${size}"  -vcodec libx264 -b ${bitrate} "${video_file}"
+rm -f $tmpfile