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Add __getitem__ to Stream too, simplify selector syntax

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* No need to have a split node in between, you can just do stream[:"a"]
* Split nodes are still needed to do actual splitting.
This commit is contained in:
Davide Depau 2017-12-21 15:33:50 +01:00
parent 646a0dcae8
commit f6d014540a
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1 changed files with 13 additions and 2 deletions
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15
ffmpeg/nodes.py
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@ -43,6 +43,17 @@ class Stream(object):
out = '{}[{!r}{}] <{}>'.format(node_repr, self.label, selector, self.node.short_hash)
return out
def __getitem__(self, item):
"""
Select a component of the stream. `stream[:X]` is analogous to `stream.node.stream(select=X)`.
Please note that this can only be used to select a substream that already exist. If you want to split
the stream, use the `split` filter.
"""
if item.start != None:
raise ValueError("Invalid syntax. Use 'stream[:\"something\"]', not 'stream[\"something\"]'.")
return self.node.stream(select=item.stop)
def get_stream_map(stream_spec):
if stream_spec is None:
@ -201,8 +212,8 @@ class OutputNode(Node):
class OutputStream(Stream):
def __init__(self, upstream_node, upstream_label):
super(OutputStream, self).__init__(upstream_node, upstream_label, {OutputNode, GlobalNode, MergeOutputsNode})
def __init__(self, upstream_node, upstream_label, upstream_selector=None):
super(OutputStream, self).__init__(upstream_node, upstream_label, {OutputNode, GlobalNode, MergeOutputsNode}, upstream_selector=upstream_selector)
class MergeOutputsNode(Node):