diff --git a/libavfilter/vf_fieldorder.c b/libavfilter/vf_fieldorder.c
index 46964fd45d..3a19500c13 100644
--- a/libavfilter/vf_fieldorder.c
+++ b/libavfilter/vf_fieldorder.c
@@ -68,17 +68,15 @@ static int query_formats(AVFilterContext *ctx)
 
 static int config_input(AVFilterLink *inlink)
 {
-    AVFilterContext   *ctx        = inlink->dst;
-    FieldOrderContext *fieldorder = ctx->priv;
+    AVFilterContext   *ctx = inlink->dst;
+    FieldOrderContext *s   = ctx->priv;
     int               plane;
 
     /** full an array with the number of bytes that the video
      *  data occupies per line for each plane of the input video */
     for (plane = 0; plane < 4; plane++) {
-        fieldorder->line_size[plane] = av_image_get_linesize(
-                inlink->format,
-                inlink->w,
-                plane);
+        s->line_size[plane] = av_image_get_linesize(inlink->format, inlink->w,
+                                                    plane);
     }
 
     return 0;
diff --git a/libavfilter/vf_format.c b/libavfilter/vf_format.c
index 56ce74c503..6d3f58ab5d 100644
--- a/libavfilter/vf_format.c
+++ b/libavfilter/vf_format.c
@@ -50,14 +50,14 @@ typedef struct {
 
 static av_cold int init(AVFilterContext *ctx)
 {
-    FormatContext *format = ctx->priv;
+    FormatContext *s = ctx->priv;
     const char *cur, *sep;
     char             pix_fmt_name[AV_PIX_FMT_NAME_MAXSIZE];
     int              pix_fmt_name_len, ret;
     enum AVPixelFormat pix_fmt;
 
     /* parse the list of formats */
-    for (cur = format->pix_fmts; cur; cur = sep ? sep + 1 : NULL) {
+    for (cur = s->pix_fmts; cur; cur = sep ? sep + 1 : NULL) {
         if (!(sep = strchr(cur, '|')))
             pix_fmt_name_len = strlen(cur);
         else
@@ -73,13 +73,13 @@ static av_cold int init(AVFilterContext *ctx)
         if ((ret = ff_parse_pixel_format(&pix_fmt, pix_fmt_name, ctx)) < 0)
             return ret;
 
-        format->listed_pix_fmt_flags[pix_fmt] = 1;
+        s->listed_pix_fmt_flags[pix_fmt] = 1;
     }
 
     return 0;
 }
 
-static AVFilterFormats *make_format_list(FormatContext *format, int flag)
+static AVFilterFormats *make_format_list(FormatContext *s, int flag)
 {
     AVFilterFormats *formats;
     enum AVPixelFormat pix_fmt;
@@ -88,7 +88,7 @@ static AVFilterFormats *make_format_list(FormatContext *format, int flag)
     formats->formats = av_malloc(sizeof(enum AVPixelFormat) * AV_PIX_FMT_NB);
 
     for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
-        if (format->listed_pix_fmt_flags[pix_fmt] == flag)
+        if (s->listed_pix_fmt_flags[pix_fmt] == flag)
             formats->formats[formats->format_count++] = pix_fmt;
 
     return formats;
diff --git a/libavfilter/vf_frei0r.c b/libavfilter/vf_frei0r.c
index ce2be64ad1..8602d3fc81 100644
--- a/libavfilter/vf_frei0r.c
+++ b/libavfilter/vf_frei0r.c
@@ -78,8 +78,8 @@ typedef struct Frei0rContext {
 
 static void *load_sym(AVFilterContext *ctx, const char *sym_name)
 {
-    Frei0rContext *frei0r = ctx->priv;
-    void *sym = dlsym(frei0r->dl_handle, sym_name);
+    Frei0rContext *s = ctx->priv;
+    void *sym = dlsym(s->dl_handle, sym_name);
     if (!sym)
         av_log(ctx, AV_LOG_ERROR, "Could not find symbol '%s' in loaded module\n", sym_name);
     return sym;
@@ -87,7 +87,7 @@ static void *load_sym(AVFilterContext *ctx, const char *sym_name)
 
 static int set_param(AVFilterContext *ctx, f0r_param_info_t info, int index, char *param)
 {
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
     union {
         double d;
         f0r_param_color_t col;
@@ -125,7 +125,7 @@ static int set_param(AVFilterContext *ctx, f0r_param_info_t info, int index, cha
         break;
     }
 
-    frei0r->set_param_value(frei0r->instance, &val, index);
+    s->set_param_value(s->instance, &val, index);
     return 0;
 
 fail:
@@ -136,18 +136,18 @@ fail:
 
 static int set_params(AVFilterContext *ctx, const char *params)
 {
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
     int i;
 
     if (!params)
         return 0;
 
-    for (i = 0; i < frei0r->plugin_info.num_params; i++) {
+    for (i = 0; i < s->plugin_info.num_params; i++) {
         f0r_param_info_t info;
         char *param;
         int ret;
 
-        frei0r->get_param_info(&info, i);
+        s->get_param_info(&info, i);
 
         if (*params) {
             if (!(param = av_get_token(&params, "|")))
@@ -180,27 +180,27 @@ static int set_params(AVFilterContext *ctx, const char *params)
 
         case F0R_PARAM_BOOL:
             v = &d;
-            frei0r->get_param_value(frei0r->instance, v, i);
+            s->get_param_value(s->instance, v, i);
             av_log(ctx, AV_LOG_DEBUG, "%s", d >= 0.5 && d <= 1.0 ? "y" : "n");
             break;
         case F0R_PARAM_DOUBLE:
             v = &d;
-            frei0r->get_param_value(frei0r->instance, v, i);
+            s->get_param_value(s->instance, v, i);
             av_log(ctx, AV_LOG_DEBUG, "%f", d);
             break;
         case F0R_PARAM_COLOR:
             v = &col;
-            frei0r->get_param_value(frei0r->instance, v, i);
+            s->get_param_value(s->instance, v, i);
             av_log(ctx, AV_LOG_DEBUG, "%f/%f/%f", col.r, col.g, col.b);
             break;
         case F0R_PARAM_POSITION:
             v = &pos;
-            frei0r->get_param_value(frei0r->instance, v, i);
+            s->get_param_value(s->instance, v, i);
             av_log(ctx, AV_LOG_DEBUG, "%f/%f", pos.x, pos.y);
             break;
         default: /* F0R_PARAM_STRING */
             v = s;
-            frei0r->get_param_value(frei0r->instance, v, i);
+            s->get_param_value(s->instance, v, i);
             av_log(ctx, AV_LOG_DEBUG, "'%s'\n", s);
             break;
         }
@@ -225,7 +225,7 @@ static int load_path(AVFilterContext *ctx, void **handle_ptr, const char *prefix
 static av_cold int frei0r_init(AVFilterContext *ctx,
                                const char *dl_name, int type)
 {
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
     f0r_init_f            f0r_init;
     f0r_get_plugin_info_f f0r_get_plugin_info;
     f0r_plugin_info_t *pi;
@@ -252,11 +252,11 @@ static av_cold int frei0r_init(AVFilterContext *ctx,
                 ret = AVERROR(ENOMEM);
                 goto check_path_end;
             }
-            ret = load_path(ctx, &frei0r->dl_handle, p1, dl_name);
+            ret = load_path(ctx, &s->dl_handle, p1, dl_name);
             av_free(p1);
             if (ret < 0)
                 goto check_path_end;
-            if (frei0r->dl_handle)
+            if (s->dl_handle)
                 break;
         }
 
@@ -265,39 +265,39 @@ static av_cold int frei0r_init(AVFilterContext *ctx,
         if (ret < 0)
             return ret;
     }
-    if (!frei0r->dl_handle && (path = getenv("HOME"))) {
+    if (!s->dl_handle && (path = getenv("HOME"))) {
         char *prefix = av_asprintf("%s/.frei0r-1/lib/", path);
         if (!prefix)
             return AVERROR(ENOMEM);
-        ret = load_path(ctx, &frei0r->dl_handle, prefix, dl_name);
+        ret = load_path(ctx, &s->dl_handle, prefix, dl_name);
         av_free(prefix);
         if (ret < 0)
             return ret;
     }
-    if (!frei0r->dl_handle) {
-        ret = load_path(ctx, &frei0r->dl_handle, "/usr/local/lib/frei0r-1/", dl_name);
+    if (!s->dl_handle) {
+        ret = load_path(ctx, &s->dl_handle, "/usr/local/lib/frei0r-1/", dl_name);
         if (ret < 0)
             return ret;
     }
-    if (!frei0r->dl_handle) {
-        ret = load_path(ctx, &frei0r->dl_handle, "/usr/lib/frei0r-1/", dl_name);
+    if (!s->dl_handle) {
+        ret = load_path(ctx, &s->dl_handle, "/usr/lib/frei0r-1/", dl_name);
         if (ret < 0)
             return ret;
     }
-    if (!frei0r->dl_handle) {
+    if (!s->dl_handle) {
         av_log(ctx, AV_LOG_ERROR, "Could not find module '%s'\n", dl_name);
         return AVERROR(EINVAL);
     }
 
     if (!(f0r_init                = load_sym(ctx, "f0r_init"           )) ||
         !(f0r_get_plugin_info     = load_sym(ctx, "f0r_get_plugin_info")) ||
-        !(frei0r->get_param_info  = load_sym(ctx, "f0r_get_param_info" )) ||
-        !(frei0r->get_param_value = load_sym(ctx, "f0r_get_param_value")) ||
-        !(frei0r->set_param_value = load_sym(ctx, "f0r_set_param_value")) ||
-        !(frei0r->update          = load_sym(ctx, "f0r_update"         )) ||
-        !(frei0r->construct       = load_sym(ctx, "f0r_construct"      )) ||
-        !(frei0r->destruct        = load_sym(ctx, "f0r_destruct"       )) ||
-        !(frei0r->deinit          = load_sym(ctx, "f0r_deinit"         )))
+        !(s->get_param_info  = load_sym(ctx, "f0r_get_param_info" )) ||
+        !(s->get_param_value = load_sym(ctx, "f0r_get_param_value")) ||
+        !(s->set_param_value = load_sym(ctx, "f0r_set_param_value")) ||
+        !(s->update          = load_sym(ctx, "f0r_update"         )) ||
+        !(s->construct       = load_sym(ctx, "f0r_construct"      )) ||
+        !(s->destruct        = load_sym(ctx, "f0r_destruct"       )) ||
+        !(s->deinit          = load_sym(ctx, "f0r_deinit"         )))
         return AVERROR(EINVAL);
 
     if (f0r_init() < 0) {
@@ -305,8 +305,8 @@ static av_cold int frei0r_init(AVFilterContext *ctx,
         return AVERROR(EINVAL);
     }
 
-    f0r_get_plugin_info(&frei0r->plugin_info);
-    pi = &frei0r->plugin_info;
+    f0r_get_plugin_info(&s->plugin_info);
+    pi = &s->plugin_info;
     if (pi->plugin_type != type) {
         av_log(ctx, AV_LOG_ERROR,
                "Invalid type '%s' for the plugin\n",
@@ -331,44 +331,44 @@ static av_cold int frei0r_init(AVFilterContext *ctx,
 
 static av_cold int filter_init(AVFilterContext *ctx)
 {
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
 
-    return frei0r_init(ctx, frei0r->dl_name, F0R_PLUGIN_TYPE_FILTER);
+    return frei0r_init(ctx, s->dl_name, F0R_PLUGIN_TYPE_FILTER);
 }
 
 static av_cold void uninit(AVFilterContext *ctx)
 {
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
 
-    if (frei0r->destruct && frei0r->instance)
-        frei0r->destruct(frei0r->instance);
-    if (frei0r->deinit)
-        frei0r->deinit();
-    if (frei0r->dl_handle)
-        dlclose(frei0r->dl_handle);
+    if (s->destruct && s->instance)
+        s->destruct(s->instance);
+    if (s->deinit)
+        s->deinit();
+    if (s->dl_handle)
+        dlclose(s->dl_handle);
 }
 
 static int config_input_props(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
 
-    if (!(frei0r->instance = frei0r->construct(inlink->w, inlink->h))) {
+    if (!(s->instance = s->construct(inlink->w, inlink->h))) {
         av_log(ctx, AV_LOG_ERROR, "Impossible to load frei0r instance\n");
         return AVERROR(EINVAL);
     }
 
-    return set_params(ctx, frei0r->params);
+    return set_params(ctx, s->params);
 }
 
 static int query_formats(AVFilterContext *ctx)
 {
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
     AVFilterFormats *formats = NULL;
 
-    if        (frei0r->plugin_info.color_model == F0R_COLOR_MODEL_BGRA8888) {
+    if        (s->plugin_info.color_model == F0R_COLOR_MODEL_BGRA8888) {
         ff_add_format(&formats, AV_PIX_FMT_BGRA);
-    } else if (frei0r->plugin_info.color_model == F0R_COLOR_MODEL_RGBA8888) {
+    } else if (s->plugin_info.color_model == F0R_COLOR_MODEL_RGBA8888) {
         ff_add_format(&formats, AV_PIX_FMT_RGBA);
     } else {                                   /* F0R_COLOR_MODEL_PACKED32 */
         static const enum AVPixelFormat pix_fmts[] = {
@@ -386,7 +386,7 @@ static int query_formats(AVFilterContext *ctx)
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
-    Frei0rContext *frei0r = inlink->dst->priv;
+    Frei0rContext *s = inlink->dst->priv;
     AVFilterLink *outlink = inlink->dst->outputs[0];
     AVFrame *out;
 
@@ -397,7 +397,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     }
     av_frame_copy_props(out, in);
 
-    frei0r->update(frei0r->instance, in->pts * av_q2d(inlink->time_base) * 1000,
+    s->update(s->instance, in->pts * av_q2d(inlink->time_base) * 1000,
                    (const uint32_t *)in->data[0],
                    (uint32_t *)out->data[0]);
 
@@ -457,56 +457,56 @@ AVFilter avfilter_vf_frei0r = {
 
 static av_cold int source_init(AVFilterContext *ctx)
 {
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
     AVRational frame_rate_q;
 
-    if (av_parse_video_size(&frei0r->w, &frei0r->h, frei0r->size) < 0) {
-        av_log(ctx, AV_LOG_ERROR, "Invalid frame size: '%s'\n", frei0r->size);
+    if (av_parse_video_size(&s->w, &s->h, s->size) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Invalid frame size: '%s'\n", s->size);
         return AVERROR(EINVAL);
     }
 
-    if (av_parse_video_rate(&frame_rate_q, frei0r->framerate) < 0) {
-        av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: '%s'\n", frei0r->framerate);
+    if (av_parse_video_rate(&frame_rate_q, s->framerate) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: '%s'\n", s->framerate);
         return AVERROR(EINVAL);
     }
-    frei0r->time_base.num = frame_rate_q.den;
-    frei0r->time_base.den = frame_rate_q.num;
+    s->time_base.num = frame_rate_q.den;
+    s->time_base.den = frame_rate_q.num;
 
-    return frei0r_init(ctx, frei0r->dl_name, F0R_PLUGIN_TYPE_SOURCE);
+    return frei0r_init(ctx, s->dl_name, F0R_PLUGIN_TYPE_SOURCE);
 }
 
 static int source_config_props(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
-    Frei0rContext *frei0r = ctx->priv;
+    Frei0rContext *s = ctx->priv;
 
-    if (av_image_check_size(frei0r->w, frei0r->h, 0, ctx) < 0)
+    if (av_image_check_size(s->w, s->h, 0, ctx) < 0)
         return AVERROR(EINVAL);
-    outlink->w = frei0r->w;
-    outlink->h = frei0r->h;
-    outlink->time_base = frei0r->time_base;
+    outlink->w = s->w;
+    outlink->h = s->h;
+    outlink->time_base = s->time_base;
     outlink->sample_aspect_ratio = (AVRational){1,1};
 
-    if (!(frei0r->instance = frei0r->construct(outlink->w, outlink->h))) {
+    if (!(s->instance = s->construct(outlink->w, outlink->h))) {
         av_log(ctx, AV_LOG_ERROR, "Impossible to load frei0r instance\n");
         return AVERROR(EINVAL);
     }
 
-    return set_params(ctx, frei0r->params);
+    return set_params(ctx, s->params);
 }
 
 static int source_request_frame(AVFilterLink *outlink)
 {
-    Frei0rContext *frei0r = outlink->src->priv;
+    Frei0rContext *s = outlink->src->priv;
     AVFrame *frame = ff_get_video_buffer(outlink, outlink->w, outlink->h);
 
     if (!frame)
         return AVERROR(ENOMEM);
 
     frame->sample_aspect_ratio = (AVRational) {1, 1};
-    frame->pts = frei0r->pts++;
+    frame->pts = s->pts++;
 
-    frei0r->update(frei0r->instance, av_rescale_q(frame->pts, frei0r->time_base, (AVRational){1,1000}),
+    s->update(s->instance, av_rescale_q(frame->pts, s->time_base, (AVRational){1,1000}),
                    NULL, (uint32_t *)frame->data[0]);
 
     return ff_filter_frame(outlink, frame);