switch to ffmpeg

README.md

@@ -4,7 +4,7 @@ to reinitialize: ./init
 
 to run: node cams.js
 
-uses fswebcam for screen capture
+uses ffmpeg for screen capture
 
 uses convert to make thumbnails
 
@@ -12,8 +12,6 @@ uses compare to measure activity
 
 can use uvcdynctrl -f to list resolutions
 
-can use fswebcam --list-controls to list controls
-
 can use sudo guvcview to adjust camera
 
 can use http-server-with-auth to serve:  
@@ -23,7 +21,7 @@ index is at http://this_address:this_port
 last image is at http://this_address:this_port/oldimage.jpg  
 
 can use Ubuntu MATE on Raspberry Pi 3:  
-sudo apt-get install nodejs-legacy npm fswebcam imagemagick guvcview  
+sudo apt-get install nodejs-legacy npm ffmpeg imagemagick guvcview  
 sudo npm install -g http-server-with-auth  
 System -> Administration -> Time and Date -> Keep synchronized with internet servers  
 

cams.js

@@ -9,24 +9,10 @@
 var image_width = 1600
 var image_height = 1200
 var thumbnail_size = 200
-var compression = 50
+var video_filter = 'vflip,hflip'
 var difference_threshold = .05
 var millisecond_image_delay = 15000
 var days_to_save = 150
-var flip = "--flip h,v"
-var settings= '\
---set "Focus, Auto"=False \
---set "Focus (absolute)"=0% \
---set "White Balance Temperature, Auto"=False \
---set "White Balance Temperature"=50% \
---set "Exposure, Auto"="Manual Mode" \
---set "Exposure, Auto Priority"=False \
---set "Exposure (Absolute)"=15% \
---set Brightness=50% \
---set Contrast=50% \
---set Saturation=50% \
---set Gain=0% \
---set Sharpness=100%'
 //
 // requires
 //
@@ -52,14 +38,16 @@ function update() {
    // take new image
    //
    console.log('\ncapture '+name)
-   while (true) {
-      execSync('fswebcam --jpeg '+compression+' --resolution '+image_width+'x'+image_height+' '+flip+' --save image.jpg')
-      //
-      // check that taking image was successful 
-      //
-      if (fs.existsSync('image.jpg'))
-         break
+   var success = true
+   do {
+      try {
+         execSync('ffmpeg -y -f v4l2 -s '+image_width+'x'+image_height+' -i /dev/video0 -vframes 1 -vf '+video_filter+' image.jpg')
+         }
+      catch(err) {
+         success = false
+         }
       }
+   while (success != true)
    //
    // remove prior images
    //
@@ -123,7 +111,16 @@ function update() {
 //
 // take initial image
 //
-execSync('fswebcam --jpeg '+compression+' --resolution '+image_width+'x'+image_height+' '+flip+' '+settings+' --save oldimage.jpg')
+var success = true
+do {
+   try {
+      execSync('ffmpeg -y -f v4l2 -s '+image_width+'x'+image_height+' -i /dev/video0 -vframes 1 -vf '+video_filter+' oldimage.jpg')
+      }
+   catch(err) {
+      success = false
+      }
+   }
+while (success != true)
 //
 // start update
 //

cams1.js

-//
-// cams.js
-//    shopcam activity monitor
-//    Neil Gershenfeld
-//    12/11/17
-//
-// settings
-//
-var image_width = 1600
-var image_height = 1200
-var thumbnail_size = 200
-var video_filter = 'vflip,hflip'
-var difference_threshold = .05
-var millisecond_image_delay = 15000
-var days_to_save = 150
-//
-// requires
-//
-const fs = require('fs')
-const exec = require('child_process').exec
-const execSync = require('child_process').execSync
-//
-// image update function
-//
-function update() {
-   //
-   // name image with time
-   //
-   var date = new Date()
-   var year = date.getFullYear()
-   var month = ('0'+(1+parseInt(date.getMonth()))).slice(-2)
-   var day = ('0'+date.getDate()).slice(-2)
-   var hour = ('0'+date.getHours()).slice(-2)
-   var minute = ('0'+date.getMinutes()).slice(-2)
-   var second = ('0'+date.getSeconds()).slice(-2)
-   var name = year+'-'+month+'-'+day+'-'+hour+'-'+minute+'-'+second+'.jpg'
-   //
-   // take new image
-   //
-   console.log('\ncapture '+name)
-   var success = true
-   do {
-      try {
-         execSync('ffmpeg -y -f v4l2 -s '+image_width+'x'+image_height+' -i /dev/video0 -vframes 1 -vf '+video_filter+' image.jpg')
-         }
-      catch(err) {
-         success = false
-         }
-      }
-   while (success != true)
-   //
-   // remove prior images
-   //
-   date.setDate(date.getDate()-days_to_save)
-   var oldyear = date.getFullYear()
-   var oldmonth = ('0'+(1+parseInt(date.getMonth()))).slice(-2)
-   var oldday = ('0'+date.getDate()).slice(-2)
-   var oldhour = ('0'+date.getHours()).slice(-2)
-   var oldminute = ('0'+date.getMinutes()).slice(-2)
-   var prefix = oldyear+'-'+oldmonth+'-'+oldday+'-'+oldhour+'-'+oldminute+'*'
-   console.log('remove '+prefix)
-   execSync('rm -f images/'+prefix+'*')
-   execSync('rm -f thumbnails/'+prefix+'*')
-   //
-   // check if image has changed beyond threshold
-   //
-   try {
-      execSync('compare -metric RMSE image.jpg oldimage.jpg null: 2>&1')
-      }
-   catch(err) {
-      var ret = String(err.stdout).split(' ')
-      var ptrl = ret[1].indexOf('(')
-      var ptrr = ret[1].indexOf(')')
-      var diff = parseFloat(ret[1].slice(ptrl+1,ptrr))
-      console.log('image difference: '+diff)
-      }
-   if (diff > difference_threshold) {
-      //
-      // size has changed, keep image
-      //
-      console.log('activity detected, save image')
-      execSync('convert image.jpg -resize '+thumbnail_size+'x'+thumbnail_size+' thumbnails/'+name)
-      execSync('cp image.jpg images/'+name)
-      //
-      // rebuild day's index
-      //
-      console.log('reindex day')
-      execSync("echo '<html><body>' > index/newindex.html")
-      execSync("echo '<script src=../display.js></script>' > index/newindex.html")
-      execSync('ls images | awk \'/^'+year+'-'+month+'-'+day+'/ { print "<img src=\\"../thumbnails/" $1 "\\" id=\\"" $1 "\\" style=\\"width:20%;height:auto;cursor:pointer;\\" onmousedown=display(\\"" $1 "\\")>" }\' >> index/newindex.html')
-      execSync("mv index/newindex.html index/"+month+"-"+day+".html")
-      //
-      // delay before next image
-      //
-      console.log('delay before next image')
-      execSync('mv image.jpg oldimage.jpg')
-      setTimeout(update,millisecond_image_delay)
-      }
-   else {
-      //
-      // size hasn't changed
-      //
-      console.log('no activity detected, don\'t save image')
-      //
-      // no delay before next image
-      //
-      execSync('mv image.jpg oldimage.jpg')
-      setTimeout(update,0)
-      }
-   }
-//
-// take initial image
-//
-var success = true
-do {
-   try {
-      execSync('ffmpeg -y -f v4l2 -s '+image_width+'x'+image_height+' -i /dev/video0 -vframes 1 -vf '+video_filter+' oldimage.jpg')
-      }
-   catch(err) {
-      success = false
-      }
-   }
-while (success != true)
-//
-// start update
-//
-update()
-