fade_video
Arguments:
- video_filename,_nb_inner_frames>0,_first_frame>=0,_last_frame={ >=0 | -1=last },_frame_step>=1,_output_filename
Description:
Create a temporal fading sequence from specified input video file, in a streamed way.
If a display window is opened, rendered frames are displayed in it during processing.
Default values:
nb_inner_frames=10, first_frame=0, last_frame=-1, frame_step=1 and output_filename=(undefined).