I've tested and this works. Cookies is being set correctly. As you can see,
I've removed the opts2 as it isn't needed anymore. I've added the cookie
update to open_url (setting the HLSContext->cookies and the opts (maybe
used on ciphered stream).

diff --git a/libavformat/hls.c b/libavformat/hls.c
index adaa33a..a654924 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -533,7 +533,11 @@ static int open_url(HLSContext *c, URLContext **uc,
const char *url, AVDictionar
     av_dict_copy(&tmp, c->avio_opts, 0);
     av_dict_copy(&tmp, opts, 0);

-    ret = ffurl_open(uc, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
+    if(ret = ffurl_open(uc, url, AVIO_FLAG_READ, c->interrupt_callback,
&tmp) == 0) {
+        // update cookies on http response with setcookies.
+        update_options(&c->cookies, "cookies", uc->priv_data);
+        av_dict_set(&opts, "cookies", c->cookies, 0);
+    }

     av_dict_free(&tmp);

@@ -969,7 +973,6 @@ static void update_options(char **dest, const char
*name, void *src)
 static int open_input(HLSContext *c, struct playlist *pls)
 {
     AVDictionary *opts = NULL;
-    AVDictionary *opts2 = NULL;
     int ret;
     struct segment *seg = pls->segments[pls->cur_seq_no -
pls->start_seq_no];

@@ -979,9 +982,6 @@ static int open_input(HLSContext *c, struct playlist
*pls)
     av_dict_set(&opts, "headers", c->headers, 0);
     av_dict_set(&opts, "seekable", "0", 0);

-    // Same opts for key request (ffurl_open mutilates the opts so it
cannot be used twice)
-    av_dict_copy(&opts2, opts, 0);
-
     if (seg->size >= 0) {
         /* try to restrict the HTTP request to the part we want
          * (if this is in fact a HTTP request) */
@@ -999,14 +999,12 @@ static int open_input(HLSContext *c, struct playlist
*pls)
         char iv[33], key[33], url[MAX_URL_SIZE];
         if (strcmp(seg->key, pls->key_url)) {
             URLContext *uc;
-            if (open_url(pls->parent->priv_data, &uc, seg->key, opts2) ==
0) {
+            if (open_url(pls->parent->priv_data, &uc, seg->key, opts) ==
0) {
                 if (ffurl_read_complete(uc, pls->key, sizeof(pls->key))
                     != sizeof(pls->key)) {
                     av_log(NULL, AV_LOG_ERROR, "Unable to read key file
%s\n",
                            seg->key);
                 }
-                update_options(&c->cookies, "cookies", uc->priv_data);
-                av_dict_set(&opts, "cookies", c->cookies, 0);
                 ffurl_close(uc);
             } else {
                 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
@@ -1038,7 +1036,7 @@ static int open_input(HLSContext *c, struct playlist
*pls)
         ret = AVERROR_PATCHWELCOME;
     }
     else
-      ret = AVERROR(ENOSYS);
+        ret = AVERROR(ENOSYS);

     /* Seek to the requested position. If this was a HTTP request, the
offset
      * should already be where want it to, but this allows e.g. local
testing
@@ -1055,7 +1053,6 @@ static int open_input(HLSContext *c, struct playlist
*pls)

 cleanup:
     av_dict_free(&opts);
-    av_dict_free(&opts2);
     pls->cur_seg_offset = 0;
     return ret;
 }
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