+ * The steps are:
+ *
+ * 1. query_formats(): call the callbacks on all filter to set lists of
+ * supported formats.
+ * When links on a filter must eventually have the same
+ * format, the lists of supported formats are the same
+ * object in memory.
+ * See:
+ *http://www.normalesup.org/~george/articles/format_negotiation_in_libavfilter/#12
<http://www.normalesup.org/%7Egeorge/articles/format_negotiation_in_libavfilter/#12>
+ *
+ *
+ * 2. query_formats(): merge lists of supported formats or insert automatic
+ * conversion filters.
I know almost nothing about this stuff, but it doesn't sound right that the
frist
two steps use the same function. Isn't step 2 merge_formats()?
Michael
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