New video for version 4

[donkirkby]

I don't think the current video includes the matplotlib stuff, and it definitely doesn't include Sublime Text support, Pyglet, or the command-line version. Possibly separate videos for each version with links between?

Notes on tools to use and settings are in issue #90.

• Emacs
• Space Tracer split into issue Make a video for Space Tracer #282.
• Sublime Text split into issue Make a video for the Sublime Text version #283
• PyCharm split into issue Make a video for the PyCharm version #281

[donkirkby]

Here are the settings and tools that I found useful this time.

Here's a command line for launching recordMyDesktop at 720p resolution:

recordmydesktop -x 350 -y 100 --width 1280 --height 720  --delay 5 -o live-py.ogv

Stop recording with Ctrl+C, and edit sections together with a moviepy script.

To check the position of the window, use xwininfo. I was using these coordinates:

Emacs or Space Tracer in terminal:
Absolute upper-left X:  322
Absolute upper-left Y:  63
Width: 1340
Height: 791

PyCharm:
Absolute upper-left X:  343
Absolute upper-left Y:  99
Width: 1295
Height: 727

Sublime:
Absolute upper-left X:  343
Absolute upper-left Y:  130
Width: 1291
Height: 690

[donkirkby]

• Next time, the Emacs display might be easier to see with Solarized light colour scheme.
• YouTube has a feature for labelling chapters by including time stamps in the description text.
• export PS1="$ "
• Clear the terminal screen with Ctrl+L.

Here's the moviepy script I used to splice all the video clips together.

from pathlib import Path

from moviepy.audio.fx.volumex import volumex
from moviepy.editor import VideoFileClip, concatenate_videoclips, afx

raw_path = Path.home() / 'Videos' / 'live-py'
raw_clips = [VideoFileClip(str(raw_path / 'emacs01-intro.ogv')).subclip(5, 24),
             VideoFileClip(str(raw_path / 'emacs02a-outline.ogv')).subclip(5, 39),
             VideoFileClip(str(raw_path / 'emacs02b-trivial.ogv')).subclip(5, 9),
             ]

mv = max(clip.audio.max_volume() for clip in raw_clips)
final_clip = concatenate_videoclips([volumex(clip, 1 / mv)
                                     for clip in raw_clips])
final_clip.write_videofile(str(raw_path / 'final.mp4'),
                           fps=15,
                           bitrate='3000k')
print('Done.')