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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 [2018/02/15 10:30] – 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.
-===== Program listing =====
+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)].
-<code bash>
-#!/bin/bash
-# The file number counter
+You can download it at [[https://github.com/fangfufu/make_interval_timer_video]].
-let counter=0
-function cleanup {
-    rm seg-*.mp4 filelist.txt
-}
-# calling convention:duration text
-function segment {
-    let min=$1/60
-    let sec=$1-${min}*60
-    ffmpeg -f lavfi -i color=c=white:size=1280x720:rate=30 \
-    -vf "drawtext=text='${2}': fontsize=80: \
-    r=30: x=(w-tw)/2: y=h-h*0.75: fontcolor=black:,\
-    drawtext=text='Duration: ${min} min ${sec} sec': fontsize=80: \
-    r=30: x=(w-tw)/2: y=h-h*0.5: fontcolor=black:,
-    drawtext=timecode='00\:00\:00\:00': fontsize=80: \
-    r=30: x=(w-tw)/2: y=h-h*0.25: fontcolor=black:" \
-    -t ${1} -preset slow -tune stillimage -y \
-    seg-${counter}.mp4
-    echo "file seg-${counter}.mp4" >> filelist.txt
-    let counter++
-}
-function output {
-    ffmpeg -f concat -i filelist.txt -c copy ${1}
-    cleanup
-}
-cleanup
-segment 300 "Easy, gradually build up"
-segment 600 "10 mile TT effort"
-segment 15  "Sprint"
-segment 600 "Easy"
-segment 600 "10 mile TT effort"
-segment 20  "Sprint"
-segment 600 "Easy"
-segment 600 "10 mile TT effort"
-segment 25  "Sprint"
-segment 300 "Cool down"
-output UEA-Triathlon-2018-02-07.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]]