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--- public:ffmpeg-based_interval_timer_for_sport_and_exercise [2018/02/07 01:47] – created fangfufu
+++ public:ffmpeg-based_interval_timer_for_sport_and_exercise [2018/02/09 18:19] – fangfufu
@@ Line 1: / Line 1: @@
 ====== FFmpeg-based Interval Timer for Sport and Exercise ======
-I unfortunately am the one of the cycling captain of UEA Triathlon Club for the academic year of 2017-2018. Possibly due to having low IQ, I have problem with keeping track of the set in a turbo session. I used to use a Matlab-based countdown timer [(https://uk.mathworks.com/matlabcentral/fileexchange/18165-countdown)]. However it always crashes at 42 seconds, possibly due to the fact that it is "The Almighty Answer to the Meaning of Life, the Universe, and Everything" [(https://www.urbandictionary.com/define.php?term=42)]. I cannot be bothered to fix the code in that Matlab countdown timer.
+I am the one of the cycling captain of UEA Triathlon Club for the academic year of 2017-2018. I always find it hard to keep track of the set in a turbo session for some reason.
-After digging through FFmpeg documentation [(https://trac.ffmpeg.org/wiki)] and the Internet [(https://en.wikipedia.org/wiki/Internet)], I figured out how to generate a text-based video which can be played on any video player that is compatible with H.264 [(https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC)].
+I used to use a Matlab-based countdown timer [(https://uk.mathworks.com/matlabcentral/fileexchange/18165-countdown)]. However it always freezes after 558 seconds had elapsed - if you set a 10-minute countdown timer, it will freeze at 42 seconds. I can't be bothered to fix the Matlab code.
-Here I present the program listing, and an example output.
+After digging through FFmpeg documentation [(https://trac.ffmpeg.org/wiki)] and the Internet, I figured out how to generate a text-based video.
+Here I present the program listing, and an example output. The script works fine on Debian Stretch.
+I have to say FFmpeg is one of my most abused software. Last time I used FFmpeg to upload arbitrary file to Youtube [(https://github.com/fangfufu/Matlab-Data-Video-Converter)].
 ===== Program listing =====
 <code bash>
 #!/bin/bash
+# Copyright <2017> <Fufu Fang>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in  the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# The content of the set
+# Format:
+# min:sec text
+turbo=(
+#Warm up
+'05:00 90 RPM Smooth pedalling'
+'02:00 95 RPM Smooth pedalling'
+'02:00 100 RPM Smooth pedalling'
+'02:00 105 RPM Smooth pedalling'
+'01:30 110 RPM Smooth pedalling'
+'00:30 120-130 RPM Maintain form'
+'02:00 90 RPM Relax and recover'
+'00:06 MAX RPM Rev out'
+'01:00 90 RPM Smooth pedalling'
+'00:06 MAX RPM Rev out'
+'01:00 90 RPM Smooth pedalling'
+'00:06 MAX RPM Rev out'
+'02:45 90 RPM Relax and recover'
+#Russian Steps
+'00:15 Max effort'
+'00:45 Recovery'
+'00:30 Max effort'
+'00:30 Recovery'
+'00:45 Max effort'
+'00:15 Recovery'
+'01:00 Max effort'
+'01:00 Recovery'
+'00:45 Max effort'
+'00:15 Recovery'
+'00:30 Max effort'
+'00:30 Recovery'
+'00:15 Max effort'
+'05:45 Recovery'
+'00:15 Max effort'
+'00:45 Recovery'
+'00:30 Max effort'
+'00:30 Recovery'
+'00:45 Max effort'
+'00:15 Recovery'
+'01:00 Max effort'
+'01:00 Recovery'
+'00:45 Max effort'
+'00:15 Recovery'
+'00:30 Max effort'
+'00:30 Recovery'
+'00:15 Max effort'
+'05:45 Recovery'
+'00:15 Max effort'
+'00:45 Recovery'
+'00:30 Max effort'
+'00:30 Recovery'
+'00:45 Max effort'
+'00:15 Recovery'
+'01:00 Max effort'
+'01:00 Recovery'
+'00:45 Max effort'
+'00:15 Recovery'
+'00:30 Max effort'
+'00:30 Recovery'
+'00:15 Max effort'
+'10:00 Cool Down'
+)
+################################################################################
+resolution=1280x720
+framerate=30
 # The file number counter
 let counter=0
+# The length of the set
+let setLen=${#turbo[@]}-1
 function cleanup {
-    rm seg-*.mp4 filelist.txt
+    rm -f seg-*.mp4 filelist.txt intro.txt
 }
-# calling convention:duration text
+# Calling convention: duration, font_size
-function segment {
+function introduction {
-    let min=$1/60
+    ffmpeg -f lavfi -i color=c=white:size=${resolution}:rate=${framerate} \
-    let sec=$1-${min}*60
+    -vf "drawtext=textfile=intro.txt: fontsize=${2}: \
-    ffmpeg -f lavfi -i color=c=white:size=1280x720:rate=30 \
+    r=${framerate}: x=(w-tw)/2: y=h-h*0.9: fontcolor=black:" \
-    -vf "drawtext=text='${2}': fontsize=80: \
+    -t ${1} -preset ultrafast -tune stillimage -y -loglevel panic -stats \
-    r=30: x=(w-tw)/2: y=h-h*0.75: fontcolor=black:,\
+    seg-${counter}.mp4
+    echo "file seg-${counter}.mp4" >> filelist.txt
+    let counter++
+}
+# Calling convention: min, sec, text_now, text_next
+function videoSegment {
+    let duration=${1}*60+${2}
+    min=${1}
+    sec=${2}
+    textNow=${3}
+    textNext=$(echo "Next -" ${4})
+    ffmpeg -f lavfi -i color=c=white:size=${resolution}:rate=${framerate} \
+    -vf "\
+    drawtext=text='${textNow}': fontsize=80: \
+    r=${framerate}: x=(w-tw)*0.5: y=h-h*0.80: fontcolor=Black:,\
+    \
     drawtext=text='Duration: ${min} min ${sec} sec': fontsize=80: \
-    r=30: x=(w-tw)/2: y=h-h*0.5: fontcolor=black:,
+    r=${framerate}: x=(w-tw)*0.5: y=h-h*0.60: fontcolor=Black:,
+    \
     drawtext=timecode='00\:00\:00\:00': fontsize=80: \
-    r=30: x=(w-tw)/2: y=h-h*0.25: fontcolor=black:" \
+    r=${framerate}: x=(w-tw)*0.5: y=h-h*0.40: fontcolor=Black:, \
-    -t ${1} -preset slow -tune stillimage -y \
+    \
+    drawtext=text='${textNext}': fontsize=50: \
+    r=${framerate}: x=(w-tw)*0.5: y=h-h*0.20: fontcolor=SlateGray:" \
+    \
+    -t ${duration} -preset ultrafast -tune stillimage -y -loglevel panic -stats \
     seg-${counter}.mp4
     echo "file seg-${counter}.mp4" >> filelist.txt
@@ Line 35: / Line 147: @@
 function output {
-    ffmpeg -f concat -i filelist.txt -c copy ${1}
+    ffmpeg -f concat -i filelist.txt -c copy -y ${1}
     cleanup
 }
+# Calling convention: segment_id
+function turboSegment {
+    thisLine=$(echo ${turbo[${1}]})
+    timing=$(echo $thisLine|cut -d ' ' -f 1)
+    min=$(echo $timing|cut -d ':' -f 1)
+    sec=$(echo $timing|cut -d ':' -f 2)
+    textNow=$(echo $thisLine|cut -d ' ' -f 2-)
+    let nextSeg=${1}+1
+    nextLine=$(echo ${turbo[${nextSeg}]}|tr ':' 'm')
+    videoSegment $min $sec "${textNow}" "${nextLine}"
+}
+################################################################################
 cleanup
-segment 300 "Easy, gradually build up"
+# Create the introduction text variable
-segment 600 "10 mile TT effort"
+printf "%s\n" "${turbo[@]}" > intro.txt
-segment 15  "Sprint"
-segment 600 "Easy"
+# introduction 10 40
-segment 600 "10 mile TT effort"
-segment 20  "Sprint"
+# read -p "Press any key to continue, or Ctrl+C to stop..."
-segment 600 "Easy"
-segment 600 "10 mile TT effort"
-segment 25  "Sprint"
-segment 300 "Cool down"
-output UEA-Triathlon-2018-02-07.mp4
+for i in $(seq 0 $setLen); do
+    turboSegment ${i}
+done
+output UEA-Triathlon-$(date --rfc-3339=date).mp4
 </code>
 ===== Example output =====
-[[https://www.youtube.com/watch?v=4dAoJzUBoJE|The turbo session set on 2018-02-08]]
+[[https://www.youtube.com/watch?v=CYHr1SqeTHw|The turbo session set on 2018-02-08]]