stream_lavf: print lavf options that could not be set

Mainly for debugging. Usually, we just set options for all possible
protocols, and we can't really know whether a certain protocol is used
beforehand. That's also the reason why avio_open2() takes a dictionary,
instead of letting the user set options directly with av_opt_set(). Or
in other words, we don't know whether an option that could be set is an
error or not, thus we print the messages only at verbose level.

1 files changed, 6 insertions, 0 deletions

diff --git a/stream/stream_lavf.c b/stream/stream_lavf.c
index 9a25d7524a..545a8dfc5c 100644
--- a/stream/stream_lavf.c
+++ b/stream/stream_lavf.c
@@ -202,6 +202,12 @@ static int open_f(stream_t *stream, int mode)
         goto out;
     }
 
+    AVDictionaryEntry *t = NULL;
+    while ((t = av_dict_get(dict, "", t, AV_DICT_IGNORE_SUFFIX))) {
+        mp_msg(MSGT_OPEN, MSGL_V, "[ffmpeg] Could not set stream option %s=%s\n",
+               t->key, t->value);
+    }
+
     if (mp_avio_has_opts(avio)) {
         uint8_t *mt = NULL;
         if (av_opt_get(avio, "mime_type", AV_OPT_SEARCH_CHILDREN, &mt) >= 0) {