RSDK-5987 convert Images with RGBA mode in RGB before converting it to JPEG (#497)

Author: Rob1in

src/viam/media/video.py

@@ -91,6 +91,8 @@ def encode_image(self, image: Union[Image.Image, RawImage]) -> bytes:
 
         if self.name in LIBRARY_SUPPORTED_FORMATS:
             buf = BytesIO()
+            if image.mode == 'RGBA' and self.name == 'JPEG':
+                image = image.convert('RGB')
             image.save(buf, format=self.name)
             return buf.getvalue()
         else: