diff --git a/ffserver.c b/ffserver.c
index d985056ee0..e83534cc76 100644
--- a/ffserver.c
+++ b/ffserver.c
@@ -812,7 +812,8 @@ static void http_send_too_busy_reply(int fd)
 static void new_connection(int server_fd, int is_rtsp)
 {
     struct sockaddr_in from_addr;
-    int fd, len;
+    socklen_t len;
+    int fd;
     HTTPContext *c = NULL;
 
     len = sizeof(from_addr);
@@ -1736,7 +1737,8 @@ static int http_parse_request(HTTPContext *c)
                     case REDIR_SDP:
                         {
                             uint8_t *sdp_data;
-                            int sdp_data_size, len;
+                            int sdp_data_size;
+                            socklen_t len;
                             struct sockaddr_in my_addr;
 
                             snprintf(q, c->buffer_size,
@@ -3019,7 +3021,8 @@ static void rtsp_cmd_describe(HTTPContext *c, const char *url)
     char path1[1024];
     const char *path;
     uint8_t *content;
-    int content_length, len;
+    int content_length;
+    socklen_t len;
     struct sockaddr_in my_addr;
 
     /* find which url is asked */
diff --git a/libavfilter/af_channelmap.c b/libavfilter/af_channelmap.c
index 6e3f021f10..57ad0e0ff7 100644
--- a/libavfilter/af_channelmap.c
+++ b/libavfilter/af_channelmap.c
@@ -125,7 +125,6 @@ static av_cold int channelmap_init(AVFilterContext *ctx, const char *args)
     ChannelMapContext *s = ctx->priv;
     int ret;
     char *mapping;
-    enum mode;
     int map_entries = 0;
     char buf[256];
     enum MappingMode mode;
diff --git a/libavformat/avio.c b/libavformat/avio.c
index b67a5026ce..6d8a8bb92a 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -85,11 +85,11 @@ const AVClass ffurl_context_class = {
 
 const char *avio_enum_protocols(void **opaque, int output)
 {
-    URLProtocol **p = (URLProtocol **)opaque;
-    *p = ffurl_protocol_next(*p);
-    if (!*p) return NULL;
-    if ((output && (*p)->url_write) || (!output && (*p)->url_read))
-        return (*p)->name;
+    URLProtocol *p;
+    *opaque = ffurl_protocol_next(*opaque);
+    if (!(p = *opaque)) return NULL;
+    if ((output && p->url_write) || (!output && p->url_read))
+        return p->name;
     return avio_enum_protocols(opaque, output);
 }
 
diff --git a/libavformat/network.c b/libavformat/network.c
index 3e142fceab..6e924bed66 100644
--- a/libavformat/network.c
+++ b/libavformat/network.c
@@ -25,9 +25,7 @@
 #include "url.h"
 #include "libavutil/time.h"
 
-#define THREADS (HAVE_PTHREADS || (defined(WIN32) && !defined(__MINGW32CE__)))
-
-#if THREADS
+#if HAVE_THREADS
 #if HAVE_PTHREADS
 #include <pthread.h>
 #else
@@ -38,7 +36,7 @@
 #if CONFIG_OPENSSL
 #include <openssl/ssl.h>
 static int openssl_init;
-#if THREADS
+#if HAVE_THREADS
 #include <openssl/crypto.h>
 #include "libavutil/avutil.h"
 pthread_mutex_t *openssl_mutexes;
@@ -59,7 +57,7 @@ static unsigned long openssl_thread_id(void)
 #endif
 #if CONFIG_GNUTLS
 #include <gnutls/gnutls.h>
-#if THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
+#if HAVE_THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
 #include <gcrypt.h>
 #include <errno.h>
 #undef malloc
@@ -75,7 +73,7 @@ void ff_tls_init(void)
     if (!openssl_init) {
         SSL_library_init();
         SSL_load_error_strings();
-#if THREADS
+#if HAVE_THREADS
         if (!CRYPTO_get_locking_callback()) {
             int i;
             openssl_mutexes = av_malloc(sizeof(pthread_mutex_t) * CRYPTO_num_locks());
@@ -91,7 +89,7 @@ void ff_tls_init(void)
     openssl_init++;
 #endif
 #if CONFIG_GNUTLS
-#if THREADS && GNUTLS_VERSION_NUMBER < 0x020b00
+#if HAVE_THREADS && GNUTLS_VERSION_NUMBER < 0x020b00
     if (gcry_control(GCRYCTL_ANY_INITIALIZATION_P) == 0)
         gcry_control(GCRYCTL_SET_THREAD_CBS, &gcry_threads_pthread);
 #endif
@@ -106,7 +104,7 @@ void ff_tls_deinit(void)
 #if CONFIG_OPENSSL
     openssl_init--;
     if (!openssl_init) {
-#if THREADS
+#if HAVE_THREADS
         if (CRYPTO_get_locking_callback() == openssl_lock) {
             int i;
             CRYPTO_set_locking_callback(NULL);
diff --git a/libavformat/udp.c b/libavformat/udp.c
index c6f0a1fd71..a88fbe48a5 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -312,7 +312,7 @@ static int udp_set_url(struct sockaddr_storage *addr,
 }
 
 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
-                             int *addr_len, const char *localaddr)
+                             socklen_t *addr_len, const char *localaddr)
 {
     int udp_fd = -1;
     struct addrinfo *res0 = NULL, *res = NULL;
@@ -500,7 +500,7 @@ static int udp_open(URLContext *h, const char *uri, int flags)
     const char *p;
     char buf[256];
     struct sockaddr_storage my_addr;
-    int len;
+    socklen_t len;
     int reuse_specified = 0;
     int i, include = 0, num_sources = 0;
     char *sources[32];