Fix libavformat compatiblity break

moviepy/video/io/ffmpeg_reader.py

@@ -415,14 +415,14 @@ def parse(self):
                 else:
                     self._last_metadata_field_added = field
                 self.result["metadata"][field] = value
-            elif line.startswith("    Stream "):
+            elif line.lstrip().startswith("Stream "):
                 # exit stream "    Metadata:"
                 if self._current_stream:
                     self._current_input_file["streams"].append(self._current_stream)
 
                 # get input number, stream number, language and type
                 main_info_match = re.search(
-                    r"^\s{4}Stream\s#(\d+):(\d+)\(?(\w+)?\)?:\s(\w+):", line
+                    r"^Stream\s#(\d+):(\d+)\(?(\w+)?\)?:\s(\w+):", line.lstrip()
                 )
                 (
                     input_number,

tests/test_ffmpeg_reader.py

@@ -487,6 +487,30 @@ def test_not_default_audio_stream_audio_bitrate():
     assert d["audio_bitrate"] == 139
 
 
+def test_stream_deidentation_not_raises_error():
+    """Test libavformat reduced streams identation to 2 spaces.
+
+    See https://github.com/FFmpeg/FFmpeg/commit/b7251aed
+    """
+    infos = """Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip.mp4':
+  Metadata:
+    major_brand     : isom
+    minor_version   : 512
+    compatible_brands: isomiso2avc1mp41
+    encoder         : Lavf58.12.100
+  Duration: 01:00:00.00, start: 0.000000, bitrate: 1222 kb/s
+  Stream #0:0(und): Video: ..., 30 tbr, 60 tbc
+    Metadata:
+      handler_name    : VideoHandler
+      vendor_id       : [0][0][0][0]
+At least one output file must be specified"""
+
+    d = FFmpegInfosParser(infos, "clip.mp4").parse()
+
+    assert d
+    assert len(d["inputs"][0]["streams"]) == 1
+
+
 def test_sequential_frame_pos():
     """test_video.mp4 contains 5 frames at 1 fps.
     Each frame is 1x1 pixels and the sequence is Red, Green, Blue, Black, White.