Run non-interactively

[dmitrybelyakov]

Currently ffmpeg will ask you questions, which freezes the process while it waits for response. That makes it problematic to use on the web.

[depau]

If the question ffmpeg is asking is if you want to overwrite the output, you can pass overwrite_output=True to get_args or run.

ffmpeg-python/ffmpeg/_run.py

Lines 112 to 115 in 7669492

	def get_args(stream_spec, overwrite_output=False):
	"""Get command-line arguments for ffmpeg."""
	nodes = get_stream_spec_nodes(stream_spec)
	args = []

ffmpeg-python/ffmpeg/_run.py

Lines 135 to 140 in 7669492

	def run(stream_spec, cmd='ffmpeg', **kwargs):
	"""Run ffmpeg on node graph.
	Args:
	**kwargs: keyword-arguments passed to ``get_args()`` (e.g. ``overwrite_output=True``).
	"""

You can pass any other options to ffmpeg by changing the cmd argument.

Check subprocess documentation.

[kkroening]

@dmitrybelyakov Depaulicious is right - adding overwrite_output=True makes the prompt go away.

Perhaps it should be the default rather than having to explicitly say overwrite_output=True. What do you think, @dmitrybelyakov?

[dmitrybelyakov]

@kkroening makes sense, yes.

[dmitrybelyakov]

@Depaulicious thanks, will do that.

[depau]

@kkroening I think the default should be True, but there should be a way to turn it off (e.g. overwrite_files=False, -n is added to the command line, =None nothing is added to the command line — ffmpeg will expect interaction).

It should never be interactive unless explicitly requested.

[kkroening]

It should never be interactive unless explicitly requested.

Agreed. I'll make the change. Thanks for the input, guys.

[kkroening]

#34 fixes this. I'll close this issue for now. Feel free to add comments on #34.