I’m trying to print a progress bar while executing ffmpeg but I’m having trouble getting the total number of frames and the current frame being processed. The error I get is AttributeError: 'NoneType' object has no attribute 'groups'. I’ve copied the function from this program and for some reason it works there but not here, even though I haven’t changed that part.
pattern_duration = re.compile(
'duration[ \t\r]?:[ \t\r]?(.+?),[ \t\r]?start', re.IGNORECASE)
pattern_progress = re.compile('time=(.+?)[ \t\r]?bitrate', re.IGNORECASE)
def execute_ffmpeg(self, manager, cmd):
proc = expect.spawn(cmd, encoding='utf-8')
self.update_progress_bar(proc, manager)
self.raise_ffmpeg_error(proc)
def update_progress_bar(self, proc, manager):
total = self.get_total_frames(proc)
cont = 0
pbar = self.initialize_progress_bar(manager)
try:
proc.expect(pattern_duration)
while True:
progress = self.get_current_frame(proc)
percent = progress / total * 100
pbar.update(percent - cont)
cont = percent
except expect.EOF:
pass
finally:
if pbar is not None:
pbar.close()
def raise_ffmpeg_error(self, proc):
proc.expect(expect.EOF)
res = proc.before
res += proc.read()
exitstatus = proc.wait()
if exitstatus:
raise ffmpeg.Error('ffmpeg', '', res)
def initialize_progress_bar(self, manager):
pbar = None
pbar = manager.counter(
total=100,
desc=self.path.rsplit(os.path.sep, 1)[-1],
unit='%',
bar_format=BAR_FMT,
counter_format=COUNTER_FMT,
leave=False
)
return pbar
def get_total_frames(self, proc):
return sum(map(lambda x: float(
x[1])*60**x[0], enumerate(reversed(proc.match.groups()[0].strip().split(':')))))
def get_current_frame(self, proc):
proc.expect(pattern_progress)
return sum(map(lambda x: float(
x[1])*60**x[0], enumerate(reversed(proc.match.groups()[0].strip().split(':')))))
proc.expect(pattern_duration)needed to go beforetotal = self.get_total_frames(proc)