Added vaapi support (#29)

* Added vaapi hwaccel params
Included hwaccel params if vaapi selected.

* Added check for bitrate with hwaccel
hwaccel does not support quality-based setting, only bitrate

README.md

@@ -199,6 +199,18 @@ This is not compatible with the `quality` option.
 opts = { bitrate: '1200k' }
 ```
 
+##### HW acceleration
+
+Enable VAAPI HW accleration if supported on your platform (typically Intel/AMD chipsets.) 
+Requires intel-media-driver package to enable.
+This is not compatiable with the `quality` option and requires a `bitrate` setting.
+The default value is `none`
+
+```js
+// values 'vaapi' or 'none'
+opts = { video-hwaccel: 'vaapi' }
+```
+
 ##### Conversion progress
 
 The `.video()` call returns an [EventEmitter](https://nodejs.org/api/events.html)

lib/video/ffargs.js

@@ -11,8 +11,16 @@ const ENCODER_CRF = {
 }
 
 exports.prepare = function (source, target, options) {
+  // output framerate
+  const args = ['-y']
+
+  // IF VAAPI acceleration needs to go before -i input files
+  if ((options.bitrate) && (options.hwaccel === 'vaapi')) {
+    args.push('-hwaccel_device', '/dev/dri/renderD128', '-hwaccel', 'vaapi', '-hwaccel_output_format', 'vaapi')
+  }
+
   // source file
-  const args = ['-i', source]
+  args.push('-i', source)
 
   // output framerate
   args.push('-r', DEFAULT_VIDEO_FPS)
@@ -27,7 +35,12 @@ exports.prepare = function (source, target, options) {
   if (options.format === 'webm') {
     args.push('-f', 'webm', '-vcodec', 'libvpx-vp9', '-strict', '-2')
   } else {
-    args.push('-f', 'mp4', '-vcodec', 'libx264')
+    args.push('-f', 'mp4')
+    if ((options.bitrate) && (options.hwaccel === 'vaapi')) {
+      args.push('-c:v', 'h264_vaapi') // if VAAPI available
+    } else {
+      args.push('-vcodec', 'libx264')
+    }
   }
 
   // set average video bitrate or perceptual quality
@@ -43,10 +56,13 @@ exports.prepare = function (source, target, options) {
   // AVCHD/MTS videos need a full-frame export to avoid interlacing artefacts
   if (path.extname(source).toLowerCase() === '.mts') {
     args.push('-vf', 'yadif=1')
+  } else if ((options.bitrate) && (options.hwaccel === 'vaapi')) {
+    // if VAAPI + here you to add the scaling option too ",scale_vaapi=1280:-1"
+    args.push('-vf', 'format=nv12|vaapi,hwupload')
   }
 
   // target filename
-  args.push('-y', target)
+  args.push(target)
 
   return args
 }