remove JFIF data in case EXIF extraction fails

Signed-off-by: Matthias <matthias@pebble>

mapillary_download.py

@@ -1,7 +1,8 @@
 import requests
 from requests.adapters import HTTPAdapter
 from requests.adapters import Retry
-import json
+from PIL import Image
+import io
 import os
 import concurrent.futures
 import argparse
@@ -64,10 +65,41 @@ def download(url, filepath, metadata=None):
     with open(str(filepath), "wb") as f:
         r = session.get(url, stream=True, timeout=6)
         try:
-            image = write_exif(r.content, metadata)
+            img = write_exif(r.content, metadata)
         except Exception as e:
-            print(f"FAILED to write exif data for {filepath}. Error: {e}")
-        f.write(image)
+            print(
+                f"{filepath} FAILED to write exif data. Error: {e} Retrying with reduced EXIF.".replace(
+                    "\n", " | "
+                )
+            )
+            # write_exif(img_byte_arr, metadata) crashes when JFIF fields present
+            # so here is a workaround to remove those fields with pillow
+            # definitely not the most elegant solution...
+            try:
+                r = session.get(url, stream=True, timeout=6)
+                im = Image.open(r.raw)
+                exif_fields = list(im.info.keys())
+                # print(f"{filepath} detected exif fields : {exif_fields}")
+                fields_to_keep = ("exif", "dpi")
+                for k in exif_fields:
+                    if k not in fields_to_keep:
+                        del im.info[k]
+                        # print(f"{filepath} deleted exif field: {k}")
+                # done cleaning, now converting pillow image back to bytearray
+                img_byte_arr = io.BytesIO()
+                im.save(img_byte_arr, format="JPEG")
+                img_byte_arr = img_byte_arr.getvalue()
+
+                img = write_exif(img_byte_arr, metadata)
+            except Exception as e:
+                print(
+                    f"{filepath} FAILED WORKAROUND. Error: {e} Saving image without EXIF data.".replace(
+                        "\n", " | "
+                    )
+                )
+                img = r.content
+
+        f.write(img)
     print("{} downloaded {}".format(filepath, r))
 
 

requirements.txt

@@ -3,3 +3,4 @@ pytz >= 2023.3
 timezonefinder >=6.2.0
 pyexiv2 >= 2.8.2
 panoramax_cli >= 1.1.1
+pillow >= 11.0.0