diff --git a/libavformat/http.c b/libavformat/http.c
index 8f39d11a88..c89f8a5517 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -132,6 +132,7 @@ typedef struct HTTPContext {
     int64_t expires;
     char *new_location;
     AVDictionary *redirect_cache;
+    uint64_t filesize_from_content_range;
 } HTTPContext;
 
 #define OFFSET(x) offsetof(HTTPContext, x)
@@ -839,7 +840,7 @@ static void parse_content_range(URLContext *h, const char *p)
         p     += 6;
         s->off = strtoull(p, NULL, 10);
         if ((slash = strchr(p, '/')) && strlen(slash) > 0)
-            s->filesize = strtoull(slash + 1, NULL, 10);
+            s->filesize_from_content_range = strtoull(slash + 1, NULL, 10);
     }
     if (s->seekable == -1 && (!s->is_akamai || s->filesize != 2147483647))
         h->is_streamed = 0; /* we _can_ in fact seek */
@@ -1341,6 +1342,7 @@ static int http_read_header(URLContext *h)
     av_freep(&s->new_location);
     s->expires = 0;
     s->chunksize = UINT64_MAX;
+    s->filesize_from_content_range = UINT64_MAX;
 
     for (;;) {
         if ((err = http_get_line(s, line, sizeof(line))) < 0)
@@ -1356,6 +1358,10 @@ static int http_read_header(URLContext *h)
         s->line_count++;
     }
 
+    // filesize from Content-Range can always be used, even if using chunked Transfer-Encoding
+    if (s->filesize_from_content_range != UINT64_MAX)
+        s->filesize = s->filesize_from_content_range;
+
     if (s->seekable == -1 && s->is_mediagateway && s->filesize == 2000000000)
         h->is_streamed = 1; /* we can in fact _not_ seek */