Added same NOTE as in Batch files

util/png2gif.sh

@@ -5,8 +5,15 @@
 #AUTH:  G. E. Deschaines
 #DESC:  Converts a sequence of PNG files to GIF files and merges
 #       the GIF files into an animated GIF file.
-
-#NOTE:  Requires the ImageMagick convert program.
+#
+# NOTE:
+#
+#   [1] Requires ImageMagick magick program.
+#
+#   [2] Invoke this shell script while working within the pyThreeD
+#       subdirectory containing img_####.png files (i.e., ./Ximg)
+#       as ../util/png2gif.sh since it's assumed relative path
+#       ../pyThreeD.py exists from where this shell script executes.
 
 # Get list of PNG files.
 

util/png2mp4.sh

@@ -5,8 +5,17 @@
 #AUTH:  G. E. Deschaines
 #DESC:  Converts a sequence of PNG files to JPEG files and merges
 #       the JPEG files into a MP4 video file.
-
-#NOTE:  Requires ffmpeg and the ImageMagick convert program.
+#
+# NOTE:
+#
+#   [1] Requires ffmpeg and the ImageMagick magick program.
+#
+#   [2] Invoke this shell script while working within the pyThreeD
+#       subdirectory containing img_####.png files (i.e., ./Ximg)
+#       as ../util/png2mp4.sh since it's assumed relative path
+#       ../pyThreeD.py exists from where this shell script executes.
+
+FFMPEG_EXE=/usr/bin/ffmpeg
 
 # Get list of PNG files.
 
@@ -34,17 +43,17 @@ FPS=`grep "img_FPS = " ../pyThreeD.py | gawk '{ print gensub(";","",1,$3) }'`
 
 SYSNAM=`uname -a`
 
-if [ "${SYSNAM%% *}" == "Linux" ] && [ -e  /usr/bin/ffmpeg ]
+if [ "${SYSNAM%% *}" == "Linux" ] && [ -e ${FFMPEG_EXE} ]
 then
   echo "Creating MP4 video:  img_anim.mp4 @ 25 fps"
-  /usr/bin/ffmpeg -loglevel error -f image2 -framerate ${FPS} -i ./img_%04d.jpg -r 25 -vcodec libx264 -b:v 8000k -crf 18 -pix_fmt yuv420p ./img_anim.mp4
+  ${FFMPEG_EXE} -loglevel error -f image2 -framerate ${FPS} -i ./img_%04d.jpg -r 25 -vcodec libx264 -b:v 8000k -crf 18 -pix_fmt yuv420p ./img_anim.mp4
   exit 0
 fi
 
-if [ "${SYSNAM%%_*}" == "CYGWIN" ] && [ -e  /usr/bin/ffmpeg ]
+if [ "${SYSNAM%%_*}" == "CYGWIN" ] && [ -e ${FFMPEG_EXE} ]
 then
   echo "Creating MP4 video:  img_anim.mp4 @ 25 fps"
-  /usr/bin/ffmpeg -loglevel error -f image2 -framerate ${FPS} -i ./img_%04d.jpg -r 25 -vcodec mpeg4 -b:v 8000k -crf 18 -pix_fmt yuv420p ./img_anim.mp4
+  ${FFMPEG_EXE} -loglevel error -f image2 -framerate ${FPS} -i ./img_%04d.jpg -r 25 -vcodec mpeg4 -b:v 8000k -crf 18 -pix_fmt yuv420p ./img_anim.mp4
   exit 0
 fi