Parse FFMPEG streams with square brackets

CHANGELOG.md

@@ -62,6 +62,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed mono clips crashing when `audio_fadein` FX applied [\#1574](https://github.com/Zulko/moviepy/pull/1574)
 - Fixed mono clips crashing when `audio_fadeout` FX applied [\#1578](https://github.com/Zulko/moviepy/pull/1578)
 - Fixed scroll FX not being scrolling [\#1591](https://github.com/Zulko/moviepy/pull/1591)
+- Fixed parsing FFMPEG streams with square brackets [\#1781](https://github.com/Zulko/moviepy/pull/1781)
 
 
 ## [v2.0.0.dev2](https://github.com/zulko/moviepy/tree/v2.0.0.dev2) (2020-10-05)

moviepy/video/io/ffmpeg_reader.py

@@ -422,7 +422,7 @@ def parse(self):
 
                 # get input number, stream number, language and type
                 main_info_match = re.search(
-                    r"^Stream\s#(\d+):(\d+)\(?(\w+)?\)?:\s(\w+):", line.lstrip()
+                    r"^Stream\s#(\d+):(\d+)[\[(]?(\w+)?[\])]?:\s(\w+):", line.lstrip()
                 )
                 (
                     input_number,
@@ -434,12 +434,16 @@ def parse(self):
                 stream_number = int(stream_number)
                 stream_type_lower = stream_type.lower()
 
+                if language is not None:
+                    if language == "und" or language.startswith("0x"):
+                        language = None
+
                 # start builiding the current stream
                 self._current_stream = {
                     "input_number": input_number,
                     "stream_number": stream_number,
                     "stream_type": stream_type_lower,
-                    "language": language if language != "und" else None,
+                    "language": language,
                     "default": not self._default_stream_found
                     or line.endswith("(default)"),
                 }

tests/test_ffmpeg_reader.py

@@ -511,6 +511,22 @@ def test_stream_deidentation_not_raises_error():
     assert len(d["inputs"][0]["streams"]) == 1
 
 
+def test_stream_square_brackets():
+    infos = """
+Input #0, mpeg, from 'clip.mp4':
+  Duration: 00:02:15.00, start: 52874.498178, bitrate: 266 kb/s
+    Stream #0:0[0x1e0]: Video: ..., 25 tbr, 90k tbn, 50 tbc
+    Stream #0:1[0x1c0]: Audio: mp2, 0 channels, s16p
+At least one output file must be specified"""
+
+    d = FFmpegInfosParser(infos, "clip.mp4").parse()
+
+    assert d
+    assert len(d["inputs"][0]["streams"]) == 2
+    assert d["inputs"][0]["streams"][0]["language"] is None
+    assert d["inputs"][0]["streams"][1]["language"] is None
+
+
 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.