'utf-8' codec can't decode byte 0xda in position 184: invalid continuation byte

[snippsat]

Try detect encoding chardet of file.
If i save test from your example,it will work as i always save files in utf-8.

with open('test.srt', encoding='utf-8f') as f:
    file_list = [i.strip() for i in f]

Output:
>>> file_list
['9',
 '00:00:15,377 --> 00:00:18,570',
 'ESTAMOS HACIENDO',
 'UN FASCINANTE EXPERIMENTO.',
 '',
 '10',
 '00:00:19,150 --> 00:00:20,280',
 'AÚN LO ESCUCHO.']

Can also read in with utf-8 and errors='ignore' or errors='replace'.

with open('test.srt', encoding='utf-8f', errors='replace') as f:
    file_list = [i.strip() for i in f]

The lines where I do the replacement are the following:

Use string formatting f-string,then it look much nicer than all +.

hoursBegin = '12'
minutesBegin = '55'
print(f'{hoursBegin}:{minutesBegin}')

Output:
12:55