lavfi: issue error if maximum number of filters is reached

Issue an error and return a more meaningful error code in case the
maximum number of registered filters has been reached.
This is better than silently ignore the error, improve feedback.

1 files changed, 7 insertions, 2 deletions

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index c1b7c43611..d5f0c4b901 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -706,8 +706,13 @@ AVFilter *avfilter_get_by_name(const char *name)
 
 int avfilter_register(AVFilter *filter)
 {
-    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
-        return -1;
+    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB) {
+        av_log(NULL, AV_LOG_ERROR,
+               "Maximum number of registered filters %d reached, "
+               "impossible to register filter with name '%s'\n",
+               MAX_REGISTERED_AVFILTERS_NB, filter->name);
+        return AVERROR(ENOMEM);
+    }
 
     registered_avfilters[next_registered_avfilter_idx++] = filter;
     return 0;