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| author | Stefano Sabatini <stefasab@gmail.com> | 2015-01-27 13:21:56 +0100 |
|---|---|---|
| committer | Stefano Sabatini <stefasab@gmail.com> | 2015-01-29 10:12:34 +0100 |
| commit | af7b89e08be8c4b39fd70ef59f50c5940f0dd187 (patch) | |
| tree | f3ba99771cf0fe95ccd54808f456f734e716bf90 | |
| parent | d11fcf735f4ae916789d45b85a5da783f207f7ec (diff) | |
lavfi: document assumptions about the input and output labels of a filter graph description
| -rw-r--r-- | doc/filters.texi | 4 | ||||
| -rw-r--r-- | libavfilter/avfilter.h | 4 |
2 files changed, 8 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 6fd192c285..cba2697fb6 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -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 b5220b96d9..d296536151 100644 --- a/libavfilter/avfilter.h +++ b/libavfilter/avfilter.h @@ -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. |