--- a/media/libnestegg/include/nestegg.h
+++ b/media/libnestegg/include/nestegg.h
@@ -66,16 +66,17 @@ extern "C" {
 #define NESTEGG_TRACK_VIDEO   0       /**< Track is of type video. */
 #define NESTEGG_TRACK_AUDIO   1       /**< Track is of type audio. */
 #define NESTEGG_TRACK_UNKNOWN INT_MAX /**< Track is of type unknown. */
 
 #define NESTEGG_CODEC_VP8     0       /**< Track uses Google On2 VP8 codec. */
 #define NESTEGG_CODEC_VORBIS  1       /**< Track uses Xiph Vorbis codec. */
 #define NESTEGG_CODEC_VP9     2       /**< Track uses Google On2 VP9 codec. */
 #define NESTEGG_CODEC_OPUS    3       /**< Track uses Xiph Opus codec. */
+#define NESTEGG_CODEC_AV1     4       /**< Track use AOMedia AV1 codec. */
 #define NESTEGG_CODEC_UNKNOWN INT_MAX /**< Track uses unknown codec. */
 
 #define NESTEGG_VIDEO_MONO              0 /**< Track is mono video. */
 #define NESTEGG_VIDEO_STEREO_LEFT_RIGHT 1 /**< Track is side-by-side stereo video.  Left first. */
 #define NESTEGG_VIDEO_STEREO_BOTTOM_TOP 2 /**< Track is top-bottom stereo video.  Right first. */
 #define NESTEGG_VIDEO_STEREO_TOP_BOTTOM 3 /**< Track is top-bottom stereo video.  Left first. */
 #define NESTEGG_VIDEO_STEREO_RIGHT_LEFT 11 /**< Track is side-by-side stereo video.  Right first. */
 

--- a/media/libnestegg/src/nestegg.c
+++ b/media/libnestegg/src/nestegg.c
@@ -149,16 +149,17 @@ enum ebml_type_enum {
 
 /* Track Types */
 #define TRACK_TYPE_VIDEO            1
 #define TRACK_TYPE_AUDIO            2
 
 /* Track IDs */
 #define TRACK_ID_VP8                "V_VP8"
 #define TRACK_ID_VP9                "V_VP9"
+#define TRACK_ID_AV1                "V_AV1"
 #define TRACK_ID_VORBIS             "A_VORBIS"
 #define TRACK_ID_OPUS               "A_OPUS"
 
 /* Track Encryption */
 #define CONTENT_ENC_ALGO_AES        5
 #define AES_SETTINGS_CIPHER_CTR     1
 
 /* Packet Encryption */
@@ -2365,16 +2366,19 @@ nestegg_track_codec_id(nestegg * ctx, un
     return -1;
 
   if (strcmp(codec_id, TRACK_ID_VP8) == 0)
     return NESTEGG_CODEC_VP8;
 
   if (strcmp(codec_id, TRACK_ID_VP9) == 0)
     return NESTEGG_CODEC_VP9;
 
+  if (strcmp(codec_id, TRACK_ID_AV1) == 0)
+    return NESTEGG_CODEC_AV1;
+
   if (strcmp(codec_id, TRACK_ID_VORBIS) == 0)
     return NESTEGG_CODEC_VORBIS;
 
   if (strcmp(codec_id, TRACK_ID_OPUS) == 0)
     return NESTEGG_CODEC_OPUS;
 
   return NESTEGG_CODEC_UNKNOWN;
 }