This Python script sets all videos in ProShow Producer to "Lock slide time to video length" mode

SetAutoLengthForAllVideosInProshowProducer.py

import re
from pathlib import Path

project_path = input('Please paste path to the ProShow Producer project:\n')
with open(project_path) as file:
    lines = [line.rstrip() for line in file]
project_text = '\n'.join(lines)

cell_re = r"cell\[(\d+)]\.images\[0]\.isVideo=1"
cell_matches = re.findall(cell_re, project_text, re.MULTILINE)

for match in cell_matches:
    match: re.Match

    video_name = None
    for line in lines:
        video_name = re.match(rf"cell\[{match}]\.images\[0]\.image=(.*?)$", line, re.MULTILINE)
        if video_name is not None: break

    if video_name:
        print(f'Found video {video_name.group(1)} on {match}')

        if not any(filter(lambda x: x.startswith(f"cell[{match}].images[0].videoTimeLocked=1"), lines)):
            for i in range(len(lines)):
                if lines[i].startswith(f'cell[{match}].images[0].videoVolume'):
                    lines.insert(i + 1, f'cell[{match}].images[0].videoTimeLocked=1')
                    print(f'Set {match} video to auto length!')
                    break
        else:
            print(f'{match} video length is already auto length!')
    else:
        print(f'Error for {match}')

p = Path(project_path)
for i in range(1, 1000):
    try:
        p.rename(Path(p.parent, f"{p.stem}_orig ({i}){p.suffix}"))
        break
    except FileExistsError:
        pass
print(str(p))

with open(project_path, 'w') as file:
    file.write('\n'.join(lines))

print(f'Saved to "{project_path}"!')