[FFmpeg-devel] [PATCH] lavfi: document assumptions about the input and output labels of a filter graph description
stefasab at gmail.com
Tue Jan 27 14:06:27 CET 2015
doc/filters.texi | 4 ++++
libavfilter/avfilter.h | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index 6fd192c..cba2697 100644
@@ -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.
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index b5220b9..d296536 100644
@@ -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.
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