How to use the Trim filter with PyAV

[LettsDoSomeCoding]

Hi,

Great project!

I am trying to create a script that automatically cuts videos into 60 second segments, as well as remove the silence at the start of the video (although this is stretch goal). I've been looking at some examples of using filters that others have provided (e.g. #742 (comment)) and thought I could apply similar logic to use the Trim filter.

I've gotten this far with my code

input_container=av.open(filePath, mode='r')
input_video_stream=input_container.streams.video[0]
output_container=av.open('out.mp4', mode='w')
output_video_stream=output_container.add_stream(template=input_video_stream)

graph = av.filter.Graph()

input_src=graph.add_buffer(template=input_container.streams.video[0])
trim = graph.add('trim', '0:60')
input_src.link_to(trim)
graph.configure()

But the graph.configure() function is giving the following error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "av/filter/graph.pyx", line 38, in av.filter.graph.Graph.configure
  File "av/filter/graph.pyx", line 42, in av.filter.graph.Graph.configure
  File "av/error.pyx", line 326, in av.error.err_check
av.error.ValueError: [Errno 22] Invalid argument

I've taken a look at the configure function and it seems like the arguments that haven't been filled should have defaults that seem reasonable, to my untrained eye.

I'm probably completely misunderstanding how to use the Graph Class as I'm fairly new to ffmpeg and PyAV, so I'm very happy for people to tell me what to do or what docs I need to read.