diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
index bafa2b4d0a..bf168c886e 100644
--- a/libavcodec/vp6.c
+++ b/libavcodec/vp6.c
@@ -63,8 +63,8 @@ static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
             return 0;
         s->filter_header = buf[1] & 0x06;
         if (buf[1] & 1) {
-            av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
-            return 0;
+            av_log_missing_feature(s->avctx, "Interlacing", 0);
+            return AVERROR_PATCHWELCOME;
         }
         if (separated_coeff || !s->filter_header) {
             coeff_offset = AV_RB16(buf+2) - 2;
diff --git a/libavfilter/af_asyncts.c b/libavfilter/af_asyncts.c
index b5d0aea973..785c9c4acd 100644
--- a/libavfilter/af_asyncts.c
+++ b/libavfilter/af_asyncts.c
@@ -110,6 +110,12 @@ static int config_props(AVFilterLink *link)
     return 0;
 }
 
+/* get amount of data currently buffered, in samples */
+static int64_t get_delay(ASyncContext *s)
+{
+    return avresample_available(s->avr) + avresample_get_delay(s->avr);
+}
+
 static int request_frame(AVFilterLink *link)
 {
     AVFilterContext *ctx = link->src;
@@ -122,7 +128,7 @@ static int request_frame(AVFilterLink *link)
         ret = ff_request_frame(ctx->inputs[0]);
 
     /* flush the fifo */
-    if (ret == AVERROR_EOF && (nb_samples = avresample_get_delay(s->avr))) {
+    if (ret == AVERROR_EOF && (nb_samples = get_delay(s))) {
         AVFilterBufferRef *buf = ff_get_audio_buffer(link, AV_PERM_WRITE,
                                                      nb_samples);
         if (!buf)
@@ -149,12 +155,6 @@ static int write_to_fifo(ASyncContext *s, AVFilterBufferRef *buf)
     return ret;
 }
 
-/* get amount of data currently buffered, in samples */
-static int64_t get_delay(ASyncContext *s)
-{
-    return avresample_available(s->avr) + avresample_get_delay(s->avr);
-}
-
 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
 {
     AVFilterContext  *ctx = inlink->dst;
@@ -191,7 +191,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
         if (s->resample) {
             int comp = av_clip(delta, -s->max_comp, s->max_comp);
             av_log(ctx, AV_LOG_VERBOSE, "Compensating %d samples per second.\n", comp);
-            avresample_set_compensation(s->avr, delta, inlink->sample_rate);
+            avresample_set_compensation(s->avr, comp, inlink->sample_rate);
         }
         delta = 0;
     }