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Paste the explanation to all the places they might see it.
---
libavutil/opt.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/libavutil/opt.h b/libavutil/opt.h
index e050d126ed..06cbe3c336 100644
--- a/libavutil/opt.h
+++ b/libavutil/opt.h
@@ -491,6 +491,9 @@ typedef struct AVOptionRanges {
/**
* Set the values of all AVOption fields to their default values.
*
+ * Note: after a struct is initialized, only options with the
+ * AV_OPT_FLAG_POST_INIT_SETTABLE_PARAM flag can be modified.
+ *
* @param s an AVOption-enabled struct (its first member must be a pointer to
AVClass)
*/
void av_opt_set_defaults(void *s);
@@ -500,6 +503,9 @@ void av_opt_set_defaults(void *s);
* AVOption fields for which (opt->flags & mask) == flags will have their
* default applied to s.
*
+ * Note: after a struct is initialized, only options with the
+ * AV_OPT_FLAG_POST_INIT_SETTABLE_PARAM flag can be modified.
+ *
* @param s an AVOption-enabled struct (its first member must be a pointer to
AVClass)
* @param mask combination of AV_OPT_FLAG_*
* @param flags combination of AV_OPT_FLAG_*
@@ -669,6 +675,9 @@ enum {
* key. ctx must be an AVClass context, storing is done using
* AVOptions.
*
+ * Note: after a struct is initialized, only options with the
+ * AV_OPT_FLAG_POST_INIT_SETTABLE_PARAM flag can be modified.
+ *
* @param opts options string to parse, may be NULL
* @param key_val_sep a 0-terminated list of characters used to
* separate key from value
@@ -687,6 +696,9 @@ int av_set_options_string(void *ctx, const char *opts,
* Parse the key-value pairs list in opts. For each key=value pair found,
* set the value of the corresponding option in ctx.
*
+ * Note: after a struct is initialized, only options with the
+ * AV_OPT_FLAG_POST_INIT_SETTABLE_PARAM flag can be modified.
+ *
* @param ctx the AVClass object to set options on
* @param opts the options string, key-value pairs separated by a
* delimiter
@@ -717,6 +729,9 @@ int av_opt_set_from_string(void *ctx, const char *opts,
/**
* Set all the options from a given dictionary on an object.
*
+ * Note: after a struct is initialized, only options with the
+ * AV_OPT_FLAG_POST_INIT_SETTABLE_PARAM flag can be modified.
+ *
* @param obj a struct whose first element is a pointer to AVClass
* @param options options to process. This dictionary will be freed and
replaced
* by a new one containing all options not found in obj.
@@ -734,6 +749,9 @@ int av_opt_set_dict(void *obj, struct AVDictionary
**options);
/**
* Set all the options from a given dictionary on an object.
*
+ * Note: after a struct is initialized, only options with the
+ * AV_OPT_FLAG_POST_INIT_SETTABLE_PARAM flag can be modified.
+ *
* @param obj a struct whose first element is a pointer to AVClass
* @param options options to process. This dictionary will be freed and
replaced
* by a new one containing all options not found in obj.
@@ -772,6 +790,9 @@ int av_opt_copy(void *dest, const void *src);
* @{
* Those functions set the field of obj with the given name to value.
*
+ * Note: after a struct is initialized, only options with the
+ * AV_OPT_FLAG_POST_INIT_SETTABLE_PARAM flag can be modified.
+ *
* @param[in] obj A struct whose first element is a pointer to an AVClass.
* @param[in] name the name of the field to set
* @param[in] val The value to set. In case of av_opt_set() if the field is not
--
2.45.1
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