I needed a way to make videos for my Calculus
MOOC very quickly, and so I build the
autocutter.
This tool takes a list of video files, listens to the audio to determine where I start and stop speaking, and builds an edit list suitable for MLT.
If you want help using it, please feel free to contact me.
This is a python script packaged using setuptools. The
numpy and
librosa libraries are used.
The python code also depends on
MLT being installed.
Here is a sample input file. Let's call it sample.xml
<?xml version="1.0" encoding="UTF-8"?>
<movie author="Jim Fowler">
<video src="title.mp4" audio="intro.wav" in="0" out="3"/>
<video src="welcome-to-the-course.mts"/>
<video src="doing-work-on-paper.mts" flip="true"/>
<video src="farewell-everybody.mts"/>
<video src="end-title.mp4" audio="outro.wav" in="0" out="5"/>
</movie>
If you run autocut sample.xml you will get editlist.xml
which you can then run through melt to produce a complete video.
The in and out timestamps are in seconds, relative to the given
video file. If you don't include one of them, then the missing
cutpoints are determined by listening for a human voice.
If you include a flip attribute, the video gets flipped.
If you include an audio tag, then the given audio file will play at
the same time as the given video; the script creates the appropriate
tractors and transitions to mix the audio in MLT.