diff --git a/libavfilter/af_adelay.c b/libavfilter/af_adelay.c
index ed8a8ae739..382be3dca2 100644
--- a/libavfilter/af_adelay.c
+++ b/libavfilter/af_adelay.c
@@ -31,6 +31,7 @@ typedef struct ChanDelay {
     int64_t delay;
     size_t delay_index;
     size_t index;
+    unsigned int samples_size;
     uint8_t *samples;
 } ChanDelay;
 
@@ -48,13 +49,14 @@ typedef struct AudioDelayContext {
 
     void (*delay_channel)(ChanDelay *d, int nb_samples,
                           const uint8_t *src, uint8_t *dst);
+    int (*resize_channel_samples)(ChanDelay *d, int64_t new_delay);
 } AudioDelayContext;
 
 #define OFFSET(x) offsetof(AudioDelayContext, x)
 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
 
 static const AVOption adelay_options[] = {
-    { "delays", "set list of delays for each channel", OFFSET(delays), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
+    { "delays", "set list of delays for each channel", OFFSET(delays), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A | AV_OPT_FLAG_RUNTIME_PARAM },
     { "all",    "use last available delay for remained channels", OFFSET(all), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
     { NULL }
 };
@@ -96,11 +98,93 @@ DELAY(s32, int32_t, 0)
 DELAY(flt, float,   0)
 DELAY(dbl, double,  0)
 
+#define CHANGE_DELAY(name, type, fill)                                                                  \
+static int resize_samples_## name ##p(ChanDelay *d, int64_t new_delay)                                  \
+{                                                                                                       \
+    type *samples;                                                                                      \
+                                                                                                        \
+    if (new_delay == d->delay) {                                                                        \
+        return 0;                                                                                       \
+    }                                                                                                   \
+                                                                                                        \
+    if (new_delay == 0) {                                                                               \
+        av_freep(&d->samples);                                                                          \
+        d->samples_size = 0;                                                                            \
+        d->delay = 0;                                                                                   \
+        d->index = 0;                                                                                   \
+        d->delay_index = 0;                                                                             \
+        return 0;                                                                                       \
+    }                                                                                                   \
+                                                                                                        \
+    samples = (type *) av_fast_realloc(d->samples, &d->samples_size, new_delay * sizeof(type));         \
+    if (!samples) {                                                                                     \
+        return AVERROR(ENOMEM);                                                                         \
+    }                                                                                                   \
+                                                                                                        \
+    if (new_delay < d->delay) {                                                                         \
+        if (d->index > new_delay) {                                                                     \
+            d->index -= new_delay;                                                                      \
+            memmove(samples, &samples[new_delay], d->index * sizeof(type));                             \
+            d->delay_index = new_delay;                                                                 \
+        } else if (d->delay_index > d->index) {                                                         \
+            memmove(&samples[d->index], &samples[d->index+(d->delay-new_delay)],                        \
+                    (new_delay - d->index) * sizeof(type));                                             \
+            d->delay_index -= d->delay - new_delay;                                                     \
+        }                                                                                               \
+    } else {                                                                                            \
+        size_t block_size;                                                                              \
+        if (d->delay_index >= d->delay) {                                                               \
+            block_size = (d->delay - d->index) * sizeof(type);                                          \
+            memmove(&samples[d->index+(new_delay - d->delay)], &samples[d->index], block_size);         \
+            d->delay_index = new_delay;                                                                 \
+        } else {                                                                                        \
+            d->delay_index += new_delay - d->delay;                                                     \
+        }                                                                                               \
+        block_size = (new_delay - d->delay) * sizeof(type);                                             \
+        memset(&samples[d->index], fill, block_size);                                                   \
+    }                                                                                                   \
+    d->delay = new_delay;                                                                               \
+    d->samples = (void *) samples;                                                                      \
+    return 0;                                                                                           \
+}
+
+CHANGE_DELAY(u8,  uint8_t, 0x80)
+CHANGE_DELAY(s16, int16_t, 0)
+CHANGE_DELAY(s32, int32_t, 0)
+CHANGE_DELAY(flt, float,   0)
+CHANGE_DELAY(dbl, double,  0)
+
+static int parse_delays(char *p, char **saveptr, int64_t *result, AVFilterContext *ctx, int sample_rate) {
+    float delay, div;
+    int ret;
+    char *arg;
+    char type = 0;
+
+    if (!(arg = av_strtok(p, "|", saveptr)))
+        return 1;
+
+    ret = av_sscanf(arg, "%"SCNd64"%c", result, &type);
+    if (ret != 2 || type != 'S') {
+        div = type == 's' ? 1.0 : 1000.0;
+        if (av_sscanf(arg, "%f", &delay) != 1) {
+            av_log(ctx, AV_LOG_ERROR, "Invalid syntax for delay.\n");
+            return AVERROR(EINVAL);
+        }
+        *result = delay * sample_rate / div;
+    }
+
+    if (*result < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Delay must be non negative number.\n");
+        return AVERROR(EINVAL);
+    }
+    return 0;
+}
+
 static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AudioDelayContext *s = ctx->priv;
-    char *p, *arg, *saveptr = NULL;
+    char *p, *saveptr = NULL;
     int i;
 
     s->chandelay = av_calloc(inlink->channels, sizeof(*s->chandelay));
@@ -112,29 +196,14 @@ static int config_input(AVFilterLink *inlink)
     p = s->delays;
     for (i = 0; i < s->nb_delays; i++) {
         ChanDelay *d = &s->chandelay[i];
-        float delay, div;
-        char type = 0;
         int ret;
 
-        if (!(arg = av_strtok(p, "|", &saveptr)))
+        ret = parse_delays(p, &saveptr, &d->delay, ctx, inlink->sample_rate);
+        if (ret == 1)
             break;
-
+        else if (ret < 0)
+            return ret;
         p = NULL;
-
-        ret = av_sscanf(arg, "%"SCNd64"%c", &d->delay, &type);
-        if (ret != 2 || type != 'S') {
-            div = type == 's' ? 1.0 : 1000.0;
-            if (av_sscanf(arg, "%f", &delay) != 1) {
-                av_log(ctx, AV_LOG_ERROR, "Invalid syntax for delay.\n");
-                return AVERROR(EINVAL);
-            }
-            d->delay = delay * inlink->sample_rate / div;
-        }
-
-        if (d->delay < 0) {
-            av_log(ctx, AV_LOG_ERROR, "Delay must be non negative number.\n");
-            return AVERROR(EINVAL);
-        }
     }
 
     if (s->all && i) {
@@ -171,21 +240,81 @@ static int config_input(AVFilterLink *inlink)
         d->samples = av_malloc_array(d->delay, s->block_align);
         if (!d->samples)
             return AVERROR(ENOMEM);
+        d->samples_size = d->delay * s->block_align;
 
         s->max_delay = FFMAX(s->max_delay, d->delay);
     }
 
     switch (inlink->format) {
-    case AV_SAMPLE_FMT_U8P : s->delay_channel = delay_channel_u8p ; break;
-    case AV_SAMPLE_FMT_S16P: s->delay_channel = delay_channel_s16p; break;
-    case AV_SAMPLE_FMT_S32P: s->delay_channel = delay_channel_s32p; break;
-    case AV_SAMPLE_FMT_FLTP: s->delay_channel = delay_channel_fltp; break;
-    case AV_SAMPLE_FMT_DBLP: s->delay_channel = delay_channel_dblp; break;
+    case AV_SAMPLE_FMT_U8P : s->delay_channel = delay_channel_u8p ;
+                             s->resize_channel_samples = resize_samples_u8p; break;
+    case AV_SAMPLE_FMT_S16P: s->delay_channel = delay_channel_s16p;
+                             s->resize_channel_samples = resize_samples_s16p; break;
+    case AV_SAMPLE_FMT_S32P: s->delay_channel = delay_channel_s32p;
+                             s->resize_channel_samples = resize_samples_s32p; break;
+    case AV_SAMPLE_FMT_FLTP: s->delay_channel = delay_channel_fltp;
+                             s->resize_channel_samples = resize_samples_fltp; break;
+    case AV_SAMPLE_FMT_DBLP: s->delay_channel = delay_channel_dblp;
+                             s->resize_channel_samples = resize_samples_dblp; break;
     }
 
     return 0;
 }
 
+static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
+                           char *res, int res_len, int flags)
+{
+    int ret = AVERROR(ENOSYS);
+    AVFilterLink *inlink = ctx->inputs[0];
+    AudioDelayContext *s = ctx->priv;
+
+    if (!strcmp(cmd, "delays")) {
+        int64_t delay;
+        char *p, *saveptr = NULL;
+        int64_t all_delay = -1;
+        int64_t max_delay = 0;
+        char *args_cpy = av_strdup(args);
+        if (args_cpy == NULL) {
+            return AVERROR(ENOMEM);
+        }
+
+        ret = 0;
+        p = args_cpy;
+
+        if (!strncmp(args, "all:", 4)) {
+            p = &args_cpy[4];
+            ret = parse_delays(p, &saveptr, &all_delay, ctx, inlink->sample_rate);
+            if (ret == 1)
+                ret = AVERROR(EINVAL);
+            else if (ret == 0)
+                delay = all_delay;
+        }
+
+        if (!ret) {
+            for (int i = 0; i < s->nb_delays; i++) {
+                ChanDelay *d = &s->chandelay[i];
+
+                if (all_delay < 0) {
+                    ret = parse_delays(p, &saveptr, &delay, ctx, inlink->sample_rate);
+                    if (ret != 0) {
+                        ret = 0;
+                        break;
+                    }
+                    p = NULL;
+                }
+
+                ret = s->resize_channel_samples(d, delay);
+                if (ret)
+                    break;
+                max_delay = FFMAX(max_delay, d->delay);
+            }
+            s->max_delay = FFMAX(s->max_delay, max_delay);
+        }
+        av_freep(&args_cpy);
+    }
+    return ret;
+}
+
 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 {
     AVFilterContext *ctx = inlink->dst;
@@ -330,4 +459,5 @@ const AVFilter ff_af_adelay = {
     FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_U8P, AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P,
                       AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
+    .process_command = process_command,
 };
