Get actual video duration instead of reading from metadata (#1063)

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added <!-- for new features -->
 
 ### Changed <!-- for changes in existing functionality -->
+- `ffmpeg_parse_infos()` and `VideoFileClip` now detect the actual duration of the decoded video instead of the duration stored in its metadata [#1063]
 
 ### Deprecated <!-- for soon-to-be removed features -->		
 
@@ -22,6 +23,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed <!-- for any bug fixes -->
 
 
+
 ## [v2.0.0.dev1](https://github.com/zulko/moviepy/tree/v2.0.0.dev1) (2020-06-04)
 
 [Full Changelog](https://github.com/zulko/moviepy/compare/v1.0.3...v2.0.0.dev1)

moviepy/video/io/ffmpeg_reader.py

@@ -226,8 +226,8 @@ def ffmpeg_read_image(filename, with_mask=True):
     Wraps FFMPEG_Videoreader to read just one image.
     Returns an ImageClip.
 
-    This function is not meant to be used directly in MoviePy,
-    use ImageClip instead to make clips out of image files.
+    This function is not meant to be used directly in MoviePy.
+    Use ImageClip instead to make clips out of image files.
 
     Parameters
     -----------
@@ -263,7 +263,7 @@ def ffmpeg_parse_infos(
 
     # open the file in a pipe, provoke an error, read output
     is_GIF = filename.endswith(".gif")
-    cmd = [FFMPEG_BINARY, "-i", filename]
+    cmd = [FFMPEG_BINARY, "-i", filename, "-acodec", "copy", "-f", "null", "-"]
     if is_GIF:
         cmd += ["-f", "null", "/dev/null"]