added imagePreprocessed event

README.md

@@ -6,7 +6,7 @@ Simple utility for **node/io.js** to **create straightforward video slideshows b
 
 To getting started you can take a look to the [examples](https://github.com/h2non/videoshow/tree/master/examples), [programmatic API](#api) and [command-line](#command-line-interface) interface
 
-videoshow is used in production rendering thousands of videos per month. 
+videoshow is used in production rendering thousands of videos per month.
 
 Click on the image to see an example video generated by `videoshow`:
 
@@ -271,6 +271,7 @@ Supported events for subscription:
 
 - **start** `cmd` - Fired when ffmpeg process started
 - **error** `error, stdout, stderr` - Fired when transcoding error happens
+- **imagePreprocessed** `data` - Fired when image preprocessed. data = { count: 5, index: 0}.
 - **progress** `data` - Fired with transcoding progress information
 - **codecData** `codec` - Fired when input codec data is available
 - **end** `videoPath` - Fired when the process finish successfully

lib/render.js

@@ -29,21 +29,25 @@ function render(videoshow) {
 }
 
 function processVideo(videoshow, bus) {
-  var imageJobs = convertImages(videoshow)
+  var imageJobs = convertImages(videoshow, bus)
   var merge = mergeParts(videoshow, bus)
 
   fw.series(imageJobs, merge)
 }
 
-function convertImages(videoshow) {
+function convertImages(videoshow, bus) {
   var params = options.define(videoshow.params)
 
-  return videoshow.images.map(function (image) {
+  var doneImageProcessingEvent = proxyEvent(bus)('imagePreprocessed')
+  var imagesSize = videoshow.images.length
+
+  return videoshow.images.map(function (image, ind) {
     var output = randomName()
     return function (done) {
       video(image, params, output)
         .on('error', done)
         .on('end', function () {
+          doneImageProcessingEvent({count: imagesSize, index: ind })
           done(null, output)
         })
     }