diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
index eeaff1e883..43f7656314 100644
--- a/libavformat/mp3enc.c
+++ b/libavformat/mp3enc.c
@@ -384,7 +384,7 @@ static int query_codec(enum AVCodecID id, int std_compliance)
 AVOutputFormat ff_mp2_muxer = {
     .name              = "mp2",
     .long_name         = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
-    .mime_type         = "audio/x-mpeg",
+    .mime_type         = "audio/mpeg",
     .extensions        = "mp2,m2a,mpa",
     .audio_codec       = AV_CODEC_ID_MP2,
     .video_codec       = AV_CODEC_ID_NONE,
@@ -526,7 +526,7 @@ static int mp3_write_header(struct AVFormatContext *s)
 AVOutputFormat ff_mp3_muxer = {
     .name              = "mp3",
     .long_name         = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
-    .mime_type         = "audio/x-mpeg",
+    .mime_type         = "audio/mpeg",
     .extensions        = "mp3",
     .priv_data_size    = sizeof(MP3Context),
     .audio_codec       = AV_CODEC_ID_MP3,
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 73026a023b..f773019660 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -1393,7 +1393,7 @@ static int mpegts_write_end(AVFormatContext *s)
 AVOutputFormat ff_mpegts_muxer = {
     .name              = "mpegts",
     .long_name         = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
-    .mime_type         = "video/x-mpegts",
+    .mime_type         = "video/MP2T",
     .extensions        = "ts,m2t,m2ts,mts",
     .priv_data_size    = sizeof(MpegTSWrite),
     .audio_codec       = AV_CODEC_ID_MP2,
diff --git a/libavformat/rawenc.c b/libavformat/rawenc.c
index abd7e66978..8b50fe1f17 100644
--- a/libavformat/rawenc.c
+++ b/libavformat/rawenc.c
@@ -269,7 +269,7 @@ AVOutputFormat ff_mlp_muxer = {
 AVOutputFormat ff_mpeg1video_muxer = {
     .name              = "mpeg1video",
     .long_name         = NULL_IF_CONFIG_SMALL("raw MPEG-1 video"),
-    .mime_type         = "video/x-mpeg",
+    .mime_type         = "video/mpeg",
     .extensions        = "mpg,mpeg,m1v",
     .audio_codec       = AV_CODEC_ID_NONE,
     .video_codec       = AV_CODEC_ID_MPEG1VIDEO,