Cleanup code descriptions

gif.sh

@@ -1,7 +1,8 @@
 #!/bin/sh
 
-# Converts any video to animated gif
+# Converts video to high-quality animated GIF using FFmpeg
 
+# Script parameters
 usage() {
   echo "Usage:";
   echo "\t./gif.sh [<options>] -i input.avi -o output.gif";
@@ -20,16 +21,10 @@ usage() {
 
 # Temporary palette file
 PALETTE="/tmp/palette.png"
+
 # Set start time
 START=00:00
 
-## Speed up or slow down
-#SETPTS="0.4*PTS"
-## Set crop area
-#CROP="440:440:135:15"
-## Scale if needed
-#SCALE="440:-1:flags=lanczos"
-
 # Parse arguments
 while getopts "i:o:s:d:f:x:" option; do
   case "${option}" in
@@ -43,22 +38,25 @@ while getopts "i:o:s:d:f:x:" option; do
   esac
 done
 
-# Abort without required arguments
+# TODO: Implement speed up or slow down using SETPTS="0.4*PTS"
+# TODO: Define cropping area using CROP="440:440:135:15"
+
+# Abort if required arguments are missing
 if [ -z "${INPUT}" ] || [ -z "${OUTPUT}" ]; then
     usage
 fi
 
-# Fetch duration from video if not provided
+# Fetch duration from video, if not provided
 if [ -z "${DURATION}" ]; then
   DURATION=`ffmpeg -i ${INPUT} 2>&1 | grep -oE 'Duration: [[:digit:]]{2}:[[:digit:]]{2}:[[:digit:]]{2}.[[:digit:]]{2}' | cut -d : -f 4`
 fi
 
-# Fetch fps from video if not provided
+# Fetch fps from video, if not provided
 if [ -z "${FPS}" ]; then
   FPS=`ffmpeg -i ${INPUT} 2>&1 | grep -oE '[[:digit:]]{1,4} fps' | cut -d ' ' -f 1`
 fi
 
-# Fetch width from video if not provided
+# Fetch width from video, if not provided
 if [ -z "${SCALE}" ]; then
   SCALE=`ffmpeg -i ${INPUT} 2>&1 | grep -oE ', [[:digit:]]{1,4}x[[:digit:]]{1,4}' | cut -d ' ' -f 2 | cut -d 'x' -f 1`
 fi
@@ -73,11 +71,11 @@ echo "fps = ${FPS}"
 echo "width = ${SCALE}px"
 
 # Apply filters
-#filters="fps=15,setpts=0.4*PTS,crop=440:440:135:15,scale=440:-1:flags=lanczos"
 FILTERS="fps=${FPS},scale=${SCALE}:-1:flags=lanczos"
 
 # Run two pass conversion
 echo "\nProcessing..."
 ffmpeg -v warning -ss ${START} -t ${DURATION} -i ${INPUT} -vf "$FILTERS,palettegen" -y ${PALETTE}
 ffmpeg -v warning -ss ${START} -t ${DURATION} -i ${INPUT} -i ${PALETTE} -lavfi "$FILTERS [x]; [x][1:v] paletteuse" -y ${OUTPUT}
 echo "Done!"
+