from proglog import TqdmProgressBarLogger
class MyBarLogger(TqdmProgressBarLogger):
def callback(self, **changes):
try:
index = self.state['bars']['t']['index']
total = self.state['bars']['t']['total']
percent = index / total * 100
# send percent to UI
except KeyError as e:
pass
my_logger = MyBarLogger()
#...
clip.write_videofile(filename, logger=my_logger)
P.S. Сам вопрос задал, сам и ответил. Походу у меня шиза)