diff --git a/libavcodec/flacenc.c b/libavcodec/flacenc.c
index 8624a6d987..be775cabd3 100644
--- a/libavcodec/flacenc.c
+++ b/libavcodec/flacenc.c
@@ -980,7 +980,7 @@ static int encode_residual_ch(FlacEncodeContext *s, int ch)
 
 static int count_frame_header(FlacEncodeContext *s)
 {
-    uint8_t tmp;
+    uint8_t av_unused tmp;
     int count;
 
     /*
diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index ab2cd5c596..4ba8c455ab 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -1320,7 +1320,7 @@ static int decode_frame(WMAProDecodeCtx *s)
     /** no idea what these are for, might be the number of samples
         that need to be skipped at the beginning or end of a stream */
     if (get_bits1(gb)) {
-        int skip;
+        int av_unused skip;
 
         /** usually true for the first frame */
         if (get_bits1(gb)) {
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 8ec0d19ed2..6c3c95caa2 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -428,7 +428,7 @@ static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 {
     AVStream *st;
     uint32_t type;
-    uint32_t ctype;
+    uint32_t av_unused ctype;
 
     if (c->fc->nb_streams < 1) // meta before first trak
         return 0;
diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index 8f55bbc841..037a6f166a 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -267,7 +267,8 @@ static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
 {
     NSVContext *nsv = s->priv_data;
     AVIOContext *pb = s->pb;
-    unsigned int file_size, size;
+    unsigned int av_unused file_size;
+    unsigned int size;
     int64_t duration;
     int strings_size;
     int table_entries;
@@ -546,7 +547,7 @@ static int nsv_read_chunk(AVFormatContext *s, int fill_header)
     uint32_t vsize;
     uint16_t asize;
     uint16_t auxsize;
-    uint32_t auxtag;
+    uint32_t av_unused auxtag;
 
     av_dlog(s, "%s(%d)\n", __FUNCTION__, fill_header);
 
diff --git a/libavformat/r3d.c b/libavformat/r3d.c
index 1b5dc1972a..148c6022bb 100644
--- a/libavformat/r3d.c
+++ b/libavformat/r3d.c
@@ -52,7 +52,8 @@ static int r3d_read_red1(AVFormatContext *s)
 {
     AVStream *st = av_new_stream(s, 0);
     char filename[258];
-    int tmp, tmp2;
+    int tmp;
+    int av_unused tmp2;
 
     if (!st)
         return AVERROR(ENOMEM);
@@ -139,7 +140,7 @@ static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
 static void r3d_read_reos(AVFormatContext *s)
 {
     R3DContext *r3d = s->priv_data;
-    int tmp;
+    int av_unused tmp;
 
     r3d->rdvo_offset = avio_rb32(s->pb);
     avio_rb32(s->pb); // rdvs offset
@@ -209,7 +210,8 @@ static int r3d_read_header(AVFormatContext *s, AVFormatParameters *ap)
 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
 {
     AVStream *st = s->streams[0];
-    int tmp, tmp2;
+    int tmp;
+    int av_unused tmp2;
     uint64_t pos = avio_tell(s->pb);
     unsigned dts;
     int ret;
@@ -263,7 +265,8 @@ static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
 {
     AVStream *st = s->streams[1];
-    int tmp, tmp2, samples, size;
+    int av_unused tmp, tmp2;
+    int samples, size;
     uint64_t pos = avio_tell(s->pb);
     unsigned dts;
     int ret;
diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index 4623088c38..a910cf08bb 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -321,7 +321,7 @@ int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
     avio_flush(pb);
     len = avio_close_dyn_buf(pb, &buf);
     if ((len > 0) && buf) {
-        int result;
+        int av_unused result;
         av_dlog(s->ic, "sending %d bytes of RR\n", len);
         result= ffurl_write(s->rtp_ctx, buf, len);
         av_dlog(s->ic, "result from ffurl_write: %d\n", result);
diff --git a/libavformat/utils.c b/libavformat/utils.c
index b844ab95bc..1050959dcb 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -1982,7 +1982,7 @@ static void av_estimate_timings(AVFormatContext *ic, int64_t old_offset)
 
     {
         int i;
-        AVStream *st;
+        AVStream av_unused *st;
         for(i = 0;i < ic->nb_streams; i++) {
             st = ic->streams[i];
             av_dlog(ic, "%d: start_time: %0.3f duration: %0.3f\n", i,