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| author | Nicolas George <nicolas.george@normalesup.org> | 2012-07-17 17:53:50 +0200 |
|---|---|---|
| committer | Nicolas George <nicolas.george@normalesup.org> | 2012-07-17 23:47:33 +0200 |
| commit | d4838675253513504c4e0d0ed92489b3c4e6cf8d (patch) | |
| tree | 30f78093301223457ebae15b0c72506ddcf86833 /libavfilter/avfiltergraph.h | |
| parent | f98d814bb6d061150fd782fe75c61f8e1baf9996 (diff) | |
| download | ffmpeg-d4838675253513504c4e0d0ed92489b3c4e6cf8d.tar.gz | |
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.
Diffstat (limited to 'libavfilter/avfiltergraph.h')
| -rw-r--r-- | libavfilter/avfiltergraph.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/libavfilter/avfiltergraph.h b/libavfilter/avfiltergraph.h index c55b54977a..3b05357e19 100644 --- a/libavfilter/avfiltergraph.h +++ b/libavfilter/avfiltergraph.h @@ -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. */ |