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-rw-r--r--libavformat/avio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libavformat/avio.h b/libavformat/avio.h
index 86f754e2fb..b9b4017fb3 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -186,6 +186,9 @@ int avio_check(const char *url, int flags);
*
* @param buffer Memory block for input/output operations via AVIOContext.
* The buffer must be allocated with av_malloc() and friends.
+ * It may be freed and replaced with a new buffer by libavformat.
+ * AVIOContext.buffer holds the buffer currently in use,
+ * which must be later freed with av_free().
* @param buffer_size The buffer size is very important for performance.
* For protocols with fixed blocksize it should be set to this blocksize.
* For others a typical size is a cache page, e.g. 4kb.