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lavfi: document assumptions about the input and output labels of a filter graph description

This commit is contained in:
Stefano Sabatini 2015-01-27 13:21:56 +01:00
parent d11fcf735f
commit af7b89e08b
2 changed files with 8 additions and 0 deletions
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4
doc/filters.texi
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@ -195,6 +195,10 @@ instance two input pads. The first output pad of split is labelled
output pad of split is linked to the second input pad of overlay,
which are both unlabelled.
In a filter description, if the input label of the first filter is not
specified, "in" is assumed; if the output label of the last filter is not
specified, "out" is assumed.
In a complete filterchain all the unlabelled filter input and output
pads must be connected. A filtergraph is considered valid if all the
filter input and output pads of all the filterchains are connected.

4
libavfilter/avfilter.h
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@ -1419,6 +1419,10 @@ int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
/**
* Add a graph described by a string to a graph.
*
* In the graph filters description, if the input label of the first
* filter is not specified, "in" is assumed; if the output label of
* the last filter is not specified, "out" is assumed.
*
* @param graph the filter graph where to link the parsed graph context
* @param filters string to be parsed
* @param inputs pointer to a linked list to the inputs of the graph, may be NULL.