feat: options to preserve image EXIF data and video metadata

README.md

@@ -72,6 +72,13 @@ opts = { height: 100, width: 100 }
 opts = { quality: 80 }
 ```
 
+##### Preserve EXIF Data
+
+```js
+// note: this will no longer auto-orient images according to its EXIF data
+opts = { preserveExif: true }
+```
+
 ##### Watermark
 
 You can overlay a transparent watermark over the final image:
@@ -220,6 +227,12 @@ opts = { framerate: 60 }
 opts = { framerate: 0 }   // preserve the original source video's FPS
 ```
 
+##### Preserve Metadata
+
+```js
+opts = { preserveMetadata: true }
+```
+
 ##### Conversion progress
 
 The `.video()` call returns an [EventEmitter](https://nodejs.org/api/events.html)

lib/image/gmagick.js

@@ -6,8 +6,11 @@ exports.prepare = function (source, options) {
   // start processing with GraphicsMagick
   const image = gm(source)
 
-  // read baked-in orientation info, and output a rotated image with orientation=0
-  image.autoOrient()
+  if (!options.preserveExif) {
+    // read baked-in orientation info, and output a rotated image with orientation=0
+    // note: this strips EXIF data
+    image.autoOrient()
+  }
 
   // optional watermark
   const cropping = options.width && options.height

lib/video/ffargs.js

@@ -30,6 +30,10 @@ exports.prepare = function (source, target, options) {
   // misc options
   args.push('-vsync', '2', '-movflags', '+faststart')
 
+  if (options.preserveMetadata) {
+    args.push('-map_metadata', 0)
+  }
+
   // audio bitrate
   args.push('-ab', DEFAULT_AUDIO_BITRATE)