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98 lines
3.0 KiB
98 lines
3.0 KiB
5 years ago
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from __future__ import unicode_literals
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from past.builtins import basestring
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from ._utils import basestring
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from .nodes import (
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filter_operator,
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GlobalNode,
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InputNode,
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MergeOutputsNode,
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OutputNode,
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output_operator,
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)
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def input(filename, **kwargs):
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"""Input file URL (ffmpeg ``-i`` option)
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Any supplied kwargs are passed to ffmpeg verbatim (e.g. ``t=20``,
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``f='mp4'``, ``acodec='pcm'``, etc.).
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To tell ffmpeg to read from stdin, use ``pipe:`` as the filename.
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Official documentation: `Main options <https://ffmpeg.org/ffmpeg.html#Main-options>`__
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"""
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kwargs['filename'] = filename
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fmt = kwargs.pop('f', None)
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if fmt:
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if 'format' in kwargs:
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raise ValueError("Can't specify both `format` and `f` kwargs")
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kwargs['format'] = fmt
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return InputNode(input.__name__, kwargs=kwargs).stream()
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@output_operator()
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def global_args(stream, *args):
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"""Add extra global command-line argument(s), e.g. ``-progress``.
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"""
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return GlobalNode(stream, global_args.__name__, args).stream()
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@output_operator()
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def overwrite_output(stream):
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"""Overwrite output files without asking (ffmpeg ``-y`` option)
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Official documentation: `Main options <https://ffmpeg.org/ffmpeg.html#Main-options>`__
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"""
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return GlobalNode(stream, overwrite_output.__name__, ['-y']).stream()
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@output_operator()
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def merge_outputs(*streams):
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"""Include all given outputs in one ffmpeg command line
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"""
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return MergeOutputsNode(streams, merge_outputs.__name__).stream()
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@filter_operator()
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def output(*streams_and_filename, **kwargs):
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"""Output file URL
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Syntax:
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`ffmpeg.output(stream1[, stream2, stream3...], filename, **ffmpeg_args)`
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Any supplied keyword arguments are passed to ffmpeg verbatim (e.g.
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``t=20``, ``f='mp4'``, ``acodec='pcm'``, ``vcodec='rawvideo'``,
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etc.). Some keyword-arguments are handled specially, as shown below.
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Args:
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video_bitrate: parameter for ``-b:v``, e.g. ``video_bitrate=1000``.
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audio_bitrate: parameter for ``-b:a``, e.g. ``audio_bitrate=200``.
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format: alias for ``-f`` parameter, e.g. ``format='mp4'``
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(equivalent to ``f='mp4'``).
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If multiple streams are provided, they are mapped to the same
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output.
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To tell ffmpeg to write to stdout, use ``pipe:`` as the filename.
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Official documentation: `Synopsis <https://ffmpeg.org/ffmpeg.html#Synopsis>`__
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"""
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streams_and_filename = list(streams_and_filename)
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if 'filename' not in kwargs:
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if not isinstance(streams_and_filename[-1], basestring):
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raise ValueError('A filename must be provided')
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kwargs['filename'] = streams_and_filename.pop(-1)
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streams = streams_and_filename
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fmt = kwargs.pop('f', None)
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if fmt:
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if 'format' in kwargs:
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raise ValueError("Can't specify both `format` and `f` kwargs")
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kwargs['format'] = fmt
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return OutputNode(streams, output.__name__, kwargs=kwargs).stream()
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__all__ = ['input', 'merge_outputs', 'output', 'overwrite_output']
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