Split a large file into smaller files based on some delimiter text line

file-split-by-line.py

# the text files were later used to convert into images via pango-view and later via ffmpeg to vid
text = []
filenumber = 1
with open('51D.log', 'r') as f:
    for line in f:
        if line.startswith("-----"):
            if len(text) > 0:
                with open('text' + str(filenumber).zfill(4), 'w') as out:
                    out.writelines(text)
                filenumber = filenumber+1
                text = []
        text.append(line)
        
'''
Text to Image:
pango-view --font=mono -qo img.png text1.txt
ref: https://unix.stackexchange.com/a/599254

Images to video:
	ffmpeg -framerate 1 -i img%03d.png output.mp4
	ref: https://stackoverflow.com/a/53974101/2612429

    If images are of different sizes:
	ffmpeg -i text%04d.png -vf "scale=w=1380:h=761:force_original_aspect_ratio=1,pad=1380:761:(ow-iw)/2:(oh-ih)/2" output2.mp4
'''