diff --git a/cmdutils.c b/cmdutils.c
index b1671a49f5..202b288a60 100644
--- a/cmdutils.c
+++ b/cmdutils.c
@@ -176,7 +176,7 @@ static const OptionDef *find_option(const OptionDef *po, const char *name)
     const char *p = strchr(name, ':');
     int len = p ? p - name : strlen(name);
 
-    while (po->name != NULL) {
+    while (po->name) {
         if (!strncmp(name, po->name, len) && strlen(po->name) == len)
             break;
         po++;
diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index 856d666b04..5d6db41d35 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -314,7 +314,7 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
             if (h < 0)
                 h = 0;
             if (w > 0 && h > 0) {
-                if (sub_header->rects != NULL) {
+                if (sub_header->rects) {
                     for (i = 0; i < sub_header->num_rects; i++) {
                         av_freep(&sub_header->rects[i]->pict.data[0]);
                         av_freep(&sub_header->rects[i]->pict.data[1]);
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index e7ce56c699..cfb77b078f 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -625,7 +625,7 @@ intrax8_decoded:
         if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
             return ret;
         ff_print_debug_info(s, s->current_picture_ptr);
-    } else if (s->last_picture_ptr != NULL) {
+    } else if (s->last_picture_ptr) {
         if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
             return ret;
         ff_print_debug_info(s, s->last_picture_ptr);
diff --git a/libavcodec/h264_refs.c b/libavcodec/h264_refs.c
index af7fa7b523..03c1b9c6c3 100644
--- a/libavcodec/h264_refs.c
+++ b/libavcodec/h264_refs.c
@@ -759,7 +759,7 @@ int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
                             (h->max_pic_num - 1);
 #if 0
                     if (mmco[i].short_pic_num >= h->short_ref_count ||
-                        !h->short_ref[ mmco[i].short_pic_num ]) {
+                        !h->short_ref[mmco[i].short_pic_num]) {
                         av_log(s->avctx, AV_LOG_ERROR,
                                "illegal short ref in memory management control "
                                "operation %d\n", mmco);
diff --git a/libavcodec/libvpxenc.c b/libavcodec/libvpxenc.c
index 99f8b3e312..2c438951c6 100644
--- a/libavcodec/libvpxenc.c
+++ b/libavcodec/libvpxenc.c
@@ -159,7 +159,7 @@ static void coded_frame_add(void *list, struct FrameListData *cx_frame)
 {
     struct FrameListData **p = list;
 
-    while (*p != NULL)
+    while (*p)
         p = &(*p)->next;
     *p = cx_frame;
     cx_frame->next = NULL;
diff --git a/libavcodec/libxvid.c b/libavcodec/libxvid.c
index f4935b836f..ad650dd840 100644
--- a/libavcodec/libxvid.c
+++ b/libavcodec/libxvid.c
@@ -127,7 +127,7 @@ static int xvid_ff_2pass_destroy(struct xvid_context *ref,
                                 xvid_plg_destroy_t *param) {
     /* Currently cannot think of anything to do on destruction */
     /* Still, the framework should be here for reference/use */
-    if( ref->twopassbuffer != NULL )
+    if (ref->twopassbuffer)
         ref->twopassbuffer[0] = 0;
     return 0;
 }
@@ -772,7 +772,7 @@ static av_cold int xvid_encode_close(AVCodecContext *avctx) {
     xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
 
     av_freep(&avctx->extradata);
-    if( x->twopassbuffer != NULL ) {
+    if (x->twopassbuffer) {
         av_free(x->twopassbuffer);
         av_free(x->old_twopassbuffer);
     }
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 2b86ea87fe..e3bd1675a8 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2028,7 +2028,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 s->picture_number++;
             /* latency of 1 frame for I- and P-frames */
             /* XXX: use another variable than picture_number */
-            if (s->last_picture_ptr != NULL) {
+            if (s->last_picture_ptr) {
                 int ret = av_frame_ref(pict, s->last_picture_ptr->f);
                 if (ret < 0)
                     return ret;
diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
index 3041182e25..94bda9169a 100644
--- a/libavcodec/qdm2.c
+++ b/libavcodec/qdm2.c
@@ -455,7 +455,7 @@ static void qdm2_decode_sub_packet_header(GetBitContext *gb,
 static QDM2SubPNode *qdm2_search_subpacket_type_in_list(QDM2SubPNode *list,
                                                         int type)
 {
-    while (list != NULL && list->packet != NULL) {
+    while (list && list->packet) {
         if (list->packet->type == type)
             return list;
         list = list->next;
@@ -1211,23 +1211,23 @@ static void process_synthesis_subpackets(QDM2Context *q, QDM2SubPNode *list)
     QDM2SubPNode *nodes[4];
 
     nodes[0] = qdm2_search_subpacket_type_in_list(list, 9);
-    if (nodes[0] != NULL)
+    if (nodes[0])
         process_subpacket_9(q, nodes[0]);
 
     nodes[1] = qdm2_search_subpacket_type_in_list(list, 10);
-    if (nodes[1] != NULL)
+    if (nodes[1])
         process_subpacket_10(q, nodes[1]);
     else
         process_subpacket_10(q, NULL);
 
     nodes[2] = qdm2_search_subpacket_type_in_list(list, 11);
-    if (nodes[0] != NULL && nodes[1] != NULL && nodes[2] != NULL)
+    if (nodes[0] && nodes[1] && nodes[2])
         process_subpacket_11(q, nodes[2]);
     else
         process_subpacket_11(q, NULL);
 
     nodes[3] = qdm2_search_subpacket_type_in_list(list, 12);
-    if (nodes[0] != NULL && nodes[1] != NULL && nodes[3] != NULL)
+    if (nodes[0] && nodes[1] && nodes[3])
         process_subpacket_12(q, nodes[3]);
     else
         process_subpacket_12(q, NULL);
@@ -1352,7 +1352,7 @@ static void qdm2_decode_super_block(QDM2Context *q)
         }
     } // Packet bytes loop
 
-    if (q->sub_packet_list_D[0].packet != NULL) {
+    if (q->sub_packet_list_D[0].packet) {
         process_synthesis_subpackets(q, q->sub_packet_list_D);
         q->do_synth_filter = 1;
     } else if (q->do_synth_filter) {
@@ -1939,7 +1939,7 @@ static int qdm2_decode(QDM2Context *q, const uint8_t *in, int16_t *out)
     for (ch = 0; ch < q->channels; ch++) {
         qdm2_calculate_fft(q, ch, q->sub_packet);
 
-        if (!q->has_errors && q->sub_packet_list_C[0].packet != NULL) {
+        if (!q->has_errors && q->sub_packet_list_C[0].packet) {
             SAMPLES_NEEDED_2("has errors, and C list is not empty")
             return -1;
         }
diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index 2b571c9ba2..e5b76f08ca 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -737,7 +737,7 @@ static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             i++;
     }
 
-    if (s->current_picture_ptr != NULL && s->mb_y >= s->mb_height) {
+    if (s->current_picture_ptr && s->mb_y >= s->mb_height) {
         ff_er_frame_end(&s->er);
         ff_mpv_frame_end(s);
 
@@ -745,7 +745,7 @@ static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
                 return ret;
             ff_print_debug_info(s, s->current_picture_ptr);
-        } else if (s->last_picture_ptr != NULL) {
+        } else if (s->last_picture_ptr) {
             if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
                 return ret;
             ff_print_debug_info(s, s->last_picture_ptr);
diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
index 75f321a430..4ed2a33b11 100644
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@@ -1591,7 +1591,7 @@ static int finish_frame(AVCodecContext *avctx, AVFrame *pict)
             return ret;
         ff_print_debug_info(s, s->current_picture_ptr);
         got_picture = 1;
-    } else if (s->last_picture_ptr != NULL) {
+    } else if (s->last_picture_ptr) {
         if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
             return ret;
         ff_print_debug_info(s, s->last_picture_ptr);
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 7e116ed9e2..afc0396375 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -107,7 +107,7 @@ av_cold void avcodec_register(AVCodec *codec)
     AVCodec **p;
     avcodec_init();
     p = &first_avcodec;
-    while (*p != NULL)
+    while (*p)
         p = &(*p)->next;
     *p          = codec;
     codec->next = NULL;
@@ -473,7 +473,7 @@ static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
     FramePool *pool = s->internal->pool;
     int i;
 
-    if (pic->data[0] != NULL) {
+    if (pic->data[0]) {
         av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
         return -1;
     }
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 2c7db0be1c..f0ea47134b 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -6114,7 +6114,7 @@ image:
                 goto err;
             ff_print_debug_info(s, s->current_picture_ptr);
             *got_frame = 1;
-        } else if (s->last_picture_ptr != NULL) {
+        } else if (s->last_picture_ptr) {
             if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
                 goto err;
             ff_print_debug_info(s, s->last_picture_ptr);
diff --git a/libavformat/avio.c b/libavformat/avio.c
index 80863da9e3..7f6449c087 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -98,7 +98,7 @@ int ffurl_register_protocol(URLProtocol *protocol)
 {
     URLProtocol **p;
     p = &first_protocol;
-    while (*p != NULL)
+    while (*p)
         p = &(*p)->next;
     *p             = protocol;
     protocol->next = NULL;
diff --git a/libavformat/format.c b/libavformat/format.c
index bdc90446fa..c5a57d5451 100644
--- a/libavformat/format.c
+++ b/libavformat/format.c
@@ -56,7 +56,7 @@ void av_register_input_format(AVInputFormat *format)
 {
     AVInputFormat **p = &first_iformat;
 
-    while (*p != NULL)
+    while (*p)
         p = &(*p)->next;
 
     *p = format;
@@ -67,7 +67,7 @@ void av_register_output_format(AVOutputFormat *format)
 {
     AVOutputFormat **p = &first_oformat;
 
-    while (*p != NULL)
+    while (*p)
         p = &(*p)->next;
 
     *p = format;
diff --git a/libavformat/http.c b/libavformat/http.c
index e970786312..f82002cb86 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -151,7 +151,7 @@ static int http_open_cnx_internal(URLContext *h, AVDictionary **options)
 
     proxy_path = getenv("http_proxy");
     use_proxy  = !ff_http_match_no_proxy(getenv("no_proxy"), hostname) &&
-                 proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
+                 proxy_path && av_strstart(proxy_path, "http://", NULL);
 
     if (!strcmp(proto, "https")) {
         lower_proto = "tls";
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index b168bdf9a6..42204a4acf 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1583,7 +1583,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
 
         if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
             track->codec_priv.size >= 40                &&
-            track->codec_priv.data != NULL) {
+            track->codec_priv.data) {
             track->ms_compat    = 1;
             track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
             codec_id            = ff_codec_get_id(ff_codec_bmp_tags,
@@ -1591,7 +1591,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             extradata_offset    = 40;
         } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
                    track->codec_priv.size >= 14         &&
-                   track->codec_priv.data != NULL) {
+                   track->codec_priv.data) {
             int ret;
             ffio_init_context(&b, track->codec_priv.data,
                               track->codec_priv.size,
@@ -1603,7 +1603,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             extradata_offset = FFMIN(track->codec_priv.size, 18);
         } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
                    (track->codec_priv.size >= 86)          &&
-                   (track->codec_priv.data != NULL)) {
+                   (track->codec_priv.data)) {
             track->video.fourcc = AV_RL32(track->codec_priv.data);
             codec_id            = ff_codec_get_id(ff_codec_movvideo_tags,
                                                   track->video.fourcc);
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 72dcf0a725..8af3c3419f 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -3369,7 +3369,7 @@ static int mov_write_header(AVFormatContext *s)
     /* Default mode == MP4 */
     mov->mode = MODE_MP4;
 
-    if (s->oformat != NULL) {
+    if (s->oformat) {
         if (!strcmp("3gp", s->oformat->name)) mov->mode = MODE_3GP;
         else if (!strcmp("3g2", s->oformat->name)) mov->mode = MODE_3GP|MODE_3G2;
         else if (!strcmp("mov", s->oformat->name)) mov->mode = MODE_MOV;
diff --git a/libavformat/rtmpproto.c b/libavformat/rtmpproto.c
index de09486dd7..4aaa420dd5 100644
--- a/libavformat/rtmpproto.c
+++ b/libavformat/rtmpproto.c
@@ -375,7 +375,7 @@ static int gen_connect(URLContext *s, RTMPContext *rt)
         char *param = rt->conn;
 
         // Write arbitrary AMF data to the Connect message.
-        while (param != NULL) {
+        while (param) {
             char *sep;
             param += strspn(param, " ");
             if (!*param)
diff --git a/libavformat/segment.c b/libavformat/segment.c
index 3e0eb3960e..9c757e4359 100644
--- a/libavformat/segment.c
+++ b/libavformat/segment.c
@@ -101,7 +101,7 @@ static int segment_hls_window(AVFormatContext *s, int last)
     for (i = FFMAX(0, seg->number - seg->size);
          i < seg->number; i++) {
         avio_printf(seg->pb, "#EXTINF:%d,\n", (int)seg->time);
-        if (seg->entry_prefix != NULL) {
+        if (seg->entry_prefix) {
             avio_printf(seg->pb, "%s", seg->entry_prefix);
         }
         av_get_frame_filename(buf, sizeof(buf), s->filename, i);
diff --git a/libavformat/tls.c b/libavformat/tls.c
index 1baecf4db0..7c78fda285 100644
--- a/libavformat/tls.c
+++ b/libavformat/tls.c
@@ -164,7 +164,7 @@ static int tls_open(URLContext *h, const char *uri, int flags)
 
     proxy_path = getenv("http_proxy");
     use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), host) &&
-                proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
+                proxy_path && av_strstart(proxy_path, "http://", NULL);
 
     if (use_proxy) {
         char proxy_host[200], proxy_auth[200], dest[200];
diff --git a/libavformat/url.c b/libavformat/url.c
index eeda1f0297..92cd5f183a 100644
--- a/libavformat/url.c
+++ b/libavformat/url.c
@@ -111,7 +111,7 @@ void ff_make_absolute_url(char *buf, int size, const char *base,
 
     /* Strip off any query string from base */
     path_query = strchr(buf, '?');
-    if (path_query != NULL)
+    if (path_query)
         *path_query = '\0';
 
     /* Is relative path just a new query part? */
diff --git a/libavutil/opt.c b/libavutil/opt.c
index eecc539ea5..28adef6877 100644
--- a/libavutil/opt.c
+++ b/libavutil/opt.c
@@ -544,7 +544,7 @@ int av_opt_show2(void *obj, void *av_log_obj, int req_flags, int rej_flags)
 void av_opt_set_defaults(void *s)
 {
     const AVOption *opt = NULL;
-    while ((opt = av_opt_next(s, opt)) != NULL) {
+    while ((opt = av_opt_next(s, opt))) {
         if (opt->flags & AV_OPT_FLAG_READONLY)
             continue;
 
diff --git a/tests/audiogen.c b/tests/audiogen.c
index ce6f7854ea..7f9caedd4e 100644
--- a/tests/audiogen.c
+++ b/tests/audiogen.c
@@ -177,7 +177,7 @@ int main(int argc, char **argv)
         return 1;
     }
 
-    if ((ext = strrchr(argv[1], '.')) != NULL && !strcmp(ext, ".wav"))
+    if ((ext = strrchr(argv[1], '.')) && !strcmp(ext, ".wav"))
         put_wav_header(sample_rate, nb_channels, 6 * sample_rate);
 
     /* 1 second of single freq sine at 1000 Hz */
diff --git a/tools/ismindex.c b/tools/ismindex.c
index 493fb0c602..a2eed87486 100644
--- a/tools/ismindex.c
+++ b/tools/ismindex.c
@@ -323,7 +323,7 @@ static int handle_file(struct Tracks *tracks, const char *file, int split,
         tracks->tracks[tracks->nb_tracks] = track;
 
         track->name = file;
-        if ((ptr = strrchr(file, '/')) != NULL)
+        if ((ptr = strrchr(file, '/')))
             track->name = ptr + 1;
 
         track->bitrate   = st->codec->bit_rate;