docs: update doc

Author: boomb0om

DPF/transforms/video_ffmpeg_transforms.py

@@ -137,7 +137,6 @@ def _process_filepath(self, data: TransformsFileData) -> TransformsFileData:
             args_start_str = ' '.join(ffmpeg_args_start)
             temp_filename = str(uuid.uuid4()) + '.' + ext
             ffmpeg_command = f'ffmpeg -hide_banner {args_start_str} -i {filepath} {args_str} {self.default_args} {temp_filename} -y'
-            print(ffmpeg_command)
             subprocess.run(ffmpeg_command, shell=True, capture_output=True, check=True)
             shutil.move(temp_filename, filepath)
 

docs/transforms.md

@@ -38,4 +38,19 @@ transforms = VideoFFMPEGTransforms(
     workers=8
 )
 processor.apply_transform(transforms)
+```
+
+Fast video cutting:
+_cut_start_ and _cut_duration_ columns should have values in seconds. 
+For example, cutting video from 7 to 11 second should be specified in dataframe as: _cut_start_ = 7, _cut_duration_ = 4
+```python
+from DPF.transforms import VideoFFMPEGTransforms
+
+transforms = VideoFFMPEGTransforms(
+    cut_start_col='cut_start',
+    cut_duration_col='cut_duration',
+    copy_stream=True,
+    workers=4,
+)
+processor.apply_transform(transforms)
 ```