+ entry = NULL;
+ while ((entry = av_dict_get(options, "bsfs", entry, AV_DICT_IGNORE_SUFFIX))) {
+ /* trim out strlen("bsfs") characters from key */
+ av_dict_set(&bsf_options, entry->key + 4, entry->value, 0);
+ av_dict_set(&options, entry->key, NULL, 0);
+ }