diff --git a/libavformat/asfenc.c b/libavformat/asfenc.c
index 23d83b712d..02f2a299c9 100644
--- a/libavformat/asfenc.c
+++ b/libavformat/asfenc.c
@@ -566,14 +566,11 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size,
     ff_put_guid(pb, &ff_asf_codec_comment1_header);
     avio_wl32(pb, s->nb_streams);
     for (n = 0; n < s->nb_streams; n++) {
-        AVCodec *p;
+        const AVCodecDescriptor *codec_desc;
         const char *desc;
-        int len;
-        uint8_t *buf;
-        AVIOContext *dyn_buf;
 
-        enc = s->streams[n]->codec;
-        p   = avcodec_find_encoder(enc->codec_id);
+        enc  = s->streams[n]->codec;
+        codec_desc = avcodec_descriptor_get(enc->codec_id);
 
         if (enc->codec_type == AVMEDIA_TYPE_AUDIO)
             avio_wl16(pb, 2);
@@ -585,17 +582,24 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size,
         if (enc->codec_id == AV_CODEC_ID_WMAV2)
             desc = "Windows Media Audio V8";
         else
-            desc = p ? p->name : enc->codec_name;
+            desc = codec_desc ? codec_desc->name : NULL;
 
-        if (avio_open_dyn_buf(&dyn_buf) < 0)
-            return AVERROR(ENOMEM);
+        if (desc) {
+            AVIOContext *dyn_buf;
+            uint8_t *buf;
+            int len;
 
-        avio_put_str16le(dyn_buf, desc);
-        len = avio_close_dyn_buf(dyn_buf, &buf);
-        avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
+            if (avio_open_dyn_buf(&dyn_buf) < 0)
+                return AVERROR(ENOMEM);
 
-        avio_write(pb, buf, len);
-        av_freep(&buf);
+            avio_put_str16le(dyn_buf, desc);
+            len = avio_close_dyn_buf(dyn_buf, &buf);
+            avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
+
+            avio_write(pb, buf, len);
+            av_freep(&buf);
+        } else
+            avio_wl16(pb, 0);
 
         avio_wl16(pb, 0); /* no parameters */
 
diff --git a/tests/ref/lavf/asf b/tests/ref/lavf/asf
index a90e5474fb..400278cd94 100644
--- a/tests/ref/lavf/asf
+++ b/tests/ref/lavf/asf
@@ -1,3 +1,3 @@
-6bc7dc5698c3607fad8937d14560e50c *./tests/data/lavf/lavf.asf
-333581 ./tests/data/lavf/lavf.asf
+1a8716a0358b8123c02557dfdf6c259b *./tests/data/lavf/lavf.asf
+333585 ./tests/data/lavf/lavf.asf
 ./tests/data/lavf/lavf.asf CRC=0xf6340a10
diff --git a/tests/ref/seek/lavf-asf b/tests/ref/seek/lavf-asf
index 9a14895513..b64bec3ac3 100644
--- a/tests/ref/seek/lavf-asf
+++ b/tests/ref/seek/lavf-asf
@@ -1,53 +1,53 @@
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st:-1 flags:0  ts:-1.000000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st:-1 flags:1  ts: 1.894167
-ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147889 size:   209
+ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147893 size:   209
 ret: 0         st: 0 flags:0  ts: 0.788000
-ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147889 size:   209
+ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147893 size:   209
 ret: 0         st: 0 flags:1  ts:-0.317000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st: 1 flags:0  ts: 2.577000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330289 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330293 size:   209
 ret: 0         st: 1 flags:1  ts: 1.471000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330289 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330293 size:   209
 ret: 0         st:-1 flags:0  ts: 0.365002
-ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147889 size:   209
+ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147893 size:   209
 ret: 0         st:-1 flags:1  ts:-0.740831
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st: 0 flags:0  ts: 2.153000
-ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301489 size:   209
+ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301493 size:   209
 ret: 0         st: 0 flags:1  ts: 1.048000
-ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301489 size:   209
+ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301493 size:   209
 ret: 0         st: 1 flags:0  ts:-0.058000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st: 1 flags:1  ts: 2.836000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330289 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330293 size:   209
 ret: 0         st:-1 flags:0  ts: 1.730004
-ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301489 size:   209
+ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301493 size:   209
 ret: 0         st:-1 flags:1  ts: 0.624171
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st: 0 flags:0  ts:-0.482000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st: 0 flags:1  ts: 2.413000
-ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301489 size:   209
+ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301493 size:   209
 ret: 0         st: 1 flags:0  ts: 1.307000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330289 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330293 size:   209
 ret: 0         st: 1 flags:1  ts: 0.201000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st:-1 flags:0  ts:-0.904994
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st:-1 flags:1  ts: 1.989173
-ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301489 size:   209
+ret: 0         st: 1 flags:1 dts: 0.941000 pts: 0.941000 pos: 301493 size:   209
 ret: 0         st: 0 flags:0  ts: 0.883000
-ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147889 size:   209
+ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147893 size:   209
 ret: 0         st: 0 flags:1  ts:-0.222000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208
 ret: 0         st: 1 flags:0  ts: 2.672000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330289 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330293 size:   209
 ret: 0         st: 1 flags:1  ts: 1.566000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330289 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 330293 size:   209
 ret: 0         st:-1 flags:0  ts: 0.460008
-ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147889 size:   209
+ret: 0         st: 1 flags:1 dts: 0.470000 pts: 0.470000 pos: 147893 size:   209
 ret: 0         st:-1 flags:1  ts:-0.645825
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    689 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    693 size:   208