diff --git a/ffprobe/ffprobe.py b/ffprobe/ffprobe.py
index f1eb3dc..1275dc1 100644
--- a/ffprobe/ffprobe.py
+++ b/ffprobe/ffprobe.py
@@ -118,7 +118,15 @@ class FFStream:
 
     def __init__(self, data_lines):
         for line in data_lines:
-            self.__dict__.update({key: value for key, value, *_ in [line.strip().split('=')]})
+            parts = line.strip().split('=', 1)
+            if len(parts) != 2:
+                continue
+
+            key, value = parts
+            if not key:
+                continue
+
+            self.__dict__[key] = value
 
             try:
                 self.__dict__['framerate'] = round(
diff --git a/tests/ffprobe_test.py b/tests/ffprobe_test.py
index 9078f76..3335083 100644
--- a/tests/ffprobe_test.py
+++ b/tests/ffprobe_test.py
@@ -3,6 +3,7 @@
 import os
 from ffprobe import FFProbe
 from ffprobe.exceptions import FFProbeError
+from ffprobe.ffprobe import FFStream
 
 test_dir = os.path.dirname(os.path.abspath(__file__))
 
@@ -56,3 +57,21 @@ def test_stream ():
                 print(e)
             except Exception as e:
                 print(e)
+
+def test_ffstream_ignores_multiline_side_data ():
+    stream = FFStream([
+        'index=0\n',
+        'codec_type=video\n',
+        'avg_frame_rate=24/1\n',
+        'displaymatrix=\n',
+        '00000000:            0       65536           0\n',
+        '00000001:       -65536           0           0\n',
+        '\n',
+        'rotation=-90\n',
+    ])
+
+    assert stream.index == '0'
+    assert stream.codec_type == 'video'
+    assert stream.displaymatrix == ''
+    assert stream.rotation == '-90'
+    assert stream.framerate == 24