Merge pull request #31 from noahstier/AddCropFilter

Add 'crop' filter

ffmpeg/_filters.py

@@ -152,6 +152,28 @@ def vflip(stream):
     return FilterNode(stream, vflip.__name__).stream()
 
 
+@filter_operator()
+def crop(stream, x, y, width, height, **kwargs):
+    """Crop the input video.
+
+    Args:
+        x: The horizontal position, in the input video, of the left edge of
+           the output video.
+        y: The vertical position, in the input video, of the top edge of the
+           output video.
+        width: The width of the output video. Must be greater than 0.
+        heigth: The height of the output video. Must be greater than 0.
+
+    Official documentation: `crop <https://ffmpeg.org/ffmpeg-filters.html#crop>`__
+    """
+    return FilterNode(
+        stream,
+        crop.__name__,
+        args=[width, height, x, y],
+        kwargs=kwargs
+    ).stream()
+
+
 @filter_operator()
 def drawbox(stream, x, y, width, height, color, thickness=None, **kwargs):
     """Draw a colored box on the input image.
@@ -395,6 +417,7 @@ def colorchannelmixer(stream, *args, **kwargs):
 __all__ = [
     'colorchannelmixer',
     'concat',
+    'crop',
     'drawbox',
     'filter_',
     'hflip',

ffmpeg/tests/test_ffmpeg.py

@@ -114,6 +114,7 @@ def _get_complex_filter_example():
     split1 = split[1]
 
     overlay_file = ffmpeg.input(TEST_OVERLAY_FILE)
+    overlay_file = ffmpeg.crop(overlay_file, 10, 10, 158, 112)
     return (ffmpeg
         .concat(
             split0.trim(start_frame=10, end_frame=20),
@@ -137,10 +138,11 @@ def test_get_args_complex_filter():
             '[s1]trim=end_frame=20:start_frame=10[s3];' \
             '[s2]trim=end_frame=40:start_frame=30[s4];' \
             '[s3][s4]concat=n=2[s5];' \
-            '[1]hflip[s6];' \
+            '[1]crop=158:112:10:10[s6];' \
-            '[s5][s6]overlay=eof_action=repeat[s7];' \
+            '[s6]hflip[s7];' \
-            '[s7]drawbox=50:50:120:120:red:t=5[s8]',
+            '[s5][s7]overlay=eof_action=repeat[s8];' \
-        '-map', '[s8]', TEST_OUTPUT_FILE1,
+            '[s8]drawbox=50:50:120:120:red:t=5[s9]',
+        '-map', '[s9]', TEST_OUTPUT_FILE1,
         '-y'
     ]