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avfiltergraph: document a catch in request_oldest(). 

This one is tricky. Consider a graph with two sink links, A and B.
request_oldest() requests on A, and A returns EOF. This EOF causes
a filter to flush pending frames to B; they are unrequested.
Then request_oldest() moves on to B, and B returns EOF.
This commit is contained in:
Nicolas George 2012-07-17 17:53:50 +02:00
parent f98d814bb6
commit d483867525
1 changed files with 6 additions and 0 deletions
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6
libavfilter/avfiltergraph.h
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@ -255,6 +255,12 @@ char *avfilter_graph_dump(AVFilterGraph *graph, const char *options);
* of a filtergraph, only a convenience function to help drain a filtergraph
* in a balanced way under normal circumstances.
*
* Also note that AVERROR_EOF does not mean that frames did not arrive on
* some of the sinks during the process.
* When there are multiple sink links, in case the requested link
* returns an EOF, this may cause a filter to flush pending frames
* which are sent to another sink link, although unrequested.
*
* @return the return value of ff_request_frame,
* or AVERROR_EOF of all links returned AVERROR_EOF.
*/