Carriage return do not overwrite line in Windows cmd.exe and PowerShell

[zmwangx]

I tested the package on Windows 8.1, with:

• Python 2.7.9 and 3.4.3;
• FFmpeg static builds from http://ffmpeg.zeranoe.com/builds/ (specifically, FFmpeg git-df4fca2 64-bit Static);
• Pillow installed directly through pip install Pillow (turns out there are wheel distributions for Pillow on PyPI, so there's no need to worry about external deps — so it seems to me).

metadata and storyboard both worked perfectly with the videos tested in both Python 2 and Python 3. However, the progress bar suffers from one minor problem: carriage return does not return the cursor to the beginning of the line, so the lines are not overwritten:

C:\Windows\system32>storyboard "C:\Users\Zhiming Wang\Downloads\naruto-episode-6
26__zh__06bbb67.mp4"
Processing naruto-episode-626__zh__06bbb67.mp4
Crunching metadata...
Creating thumbnail 16/16...
Drawing main storyboard...
Generating metadata sheet...
Calculating SHA-1 digest...
61.6MiB 0:00:01 [61.6MiB/s] [=========>                       ]  30% ETA 0:00:02
 147MiB 0:00:02 [83.4MiB/s] [=======================>         ]  73% ETA 0:00:00
 199MiB 0:00:02 [76.7MiB/s] [================================>] 100%

Drawing the bottom banner...
Assembling parts...
Done. Generated storyboard saved to:
C:\Users\ZHIMIN~1\AppData\Local\Temp\storyboard-zj5swd6x.jpg

I'll investigate the right way to carriage return on Windows later.

[zmwangx]

Haven't tested on Cygwin just yet.

[zmwangx]

Upon further inspection, the problem doesn't lie with \r on Windows (good to know).

Turns out cmd.exe and PowerShell on Windows are pretty dumb terminals, and once we fill the last character of the window's width, the cursor immediately move to the next line, and even carriage return won't help. Therefore, we have to leave one empty character for the cursor (which isn't even a character).

[hrchu]

nice catch!