diff --git a/ffprobe.c b/ffprobe.c
index 657867d..e64c66e 100644
--- a/ffprobe.c
+++ b/ffprobe.c
@@ -1815,7 +1815,8 @@ static void show_packet(WriterContext *w, InputFile *ifile, AVPacket *pkt, int p
     print_val("size",             pkt->size, unit_byte_str);
     if (pkt->pos != -1) print_fmt    ("pos", "%"PRId64, pkt->pos);
     else                print_str_opt("pos", "N/A");
-    print_fmt("flags", "%c",      pkt->flags & AV_PKT_FLAG_KEY ? 'K' : '_');
+    print_fmt("flags", "%c%c",      pkt->flags & AV_PKT_FLAG_KEY ? 'K' : '_',
+              pkt->flags & AV_PKT_FLAG_DISCARD ? 'D' : '_');
 
     if (pkt->side_data_elems) {
         int size;
diff --git a/tests/ref/fate/concat-demuxer-extended-lavf-mxf b/tests/ref/fate/concat-demuxer-extended-lavf-mxf
index b894938..f7905aa 100644
--- a/tests/ref/fate/concat-demuxer-extended-lavf-mxf
+++ b/tests/ref/fate/concat-demuxer-extended-lavf-mxf
@@ -1 +1 @@
-0aa1ca6ff6e2e5aa926454d22fdaecd5 *tests/data/fate/concat-demuxer-extended-lavf-mxf.ffprobe
+21eb3a629ff504b55c93a66879a31362 *tests/data/fate/concat-demuxer-extended-lavf-mxf.ffprobe
diff --git a/tests/ref/fate/concat-demuxer-extended-lavf-mxf_d10 b/tests/ref/fate/concat-demuxer-extended-lavf-mxf_d10
index b378a2d..0c49f1f 100644
--- a/tests/ref/fate/concat-demuxer-extended-lavf-mxf_d10
+++ b/tests/ref/fate/concat-demuxer-extended-lavf-mxf_d10
@@ -1 +1 @@
-14c2b8d8f82f261c9627b33c481c0e8c *tests/data/fate/concat-demuxer-extended-lavf-mxf_d10.ffprobe
+67a03ad49f1bd17131f751313639b61e *tests/data/fate/concat-demuxer-extended-lavf-mxf_d10.ffprobe
diff --git a/tests/ref/fate/concat-demuxer-simple1-lavf-mxf b/tests/ref/fate/concat-demuxer-simple1-lavf-mxf
index 3fc7957..6bba76a 100644
--- a/tests/ref/fate/concat-demuxer-simple1-lavf-mxf
+++ b/tests/ref/fate/concat-demuxer-simple1-lavf-mxf
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diff --git a/tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10 b/tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10
index 0ff1b04..75cac84 100644
--- a/tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10
+++ b/tests/ref/fate/concat-demuxer-simple1-lavf-mxf_d10
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diff --git a/tests/ref/fate/concat-demuxer-simple2-lavf-ts b/tests/ref/fate/concat-demuxer-simple2-lavf-ts
index 33337cf..4dfed4d 100644
--- a/tests/ref/fate/concat-demuxer-simple2-lavf-ts
+++ b/tests/ref/fate/concat-demuxer-simple2-lavf-ts
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diff --git a/tests/ref/fate/ffprobe_compact b/tests/ref/fate/ffprobe_compact
index d529bb6..9a5f531 100644
--- a/tests/ref/fate/ffprobe_compact
+++ b/tests/ref/fate/ffprobe_compact
@@ -1,30 +1,30 @@
-packet|codec_type=audio|stream_index=0|pts=0|pts_time=0.000000|dts=0|dts_time=0.000000|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=647|flags=K
+packet|codec_type=audio|stream_index=0|pts=0|pts_time=0.000000|dts=0|dts_time=0.000000|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=647|flags=K_
 frame|media_type=audio|stream_index=0|key_frame=1|pkt_pts=0|pkt_pts_time=0.000000|pkt_dts=0|pkt_dts_time=0.000000|best_effort_timestamp=0|best_effort_timestamp_time=0.000000|pkt_duration=1024|pkt_duration_time=0.023220|pkt_pos=647|pkt_size=2048|sample_fmt=s16|nb_samples=1024|channels=1|channel_layout=unknown
-packet|codec_type=video|stream_index=1|pts=0|pts_time=0.000000|dts=0|dts_time=0.000000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=2722|flags=K
+packet|codec_type=video|stream_index=1|pts=0|pts_time=0.000000|dts=0|dts_time=0.000000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=2722|flags=K_
 frame|media_type=video|stream_index=1|key_frame=1|pkt_pts=0|pkt_pts_time=0.000000|pkt_dts=0|pkt_dts_time=0.000000|best_effort_timestamp=0|best_effort_timestamp_time=0.000000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=2722|pkt_size=230400|width=320|height=240|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
-packet|codec_type=video|stream_index=2|pts=0|pts_time=0.000000|dts=0|dts_time=0.000000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=233143|flags=K
+packet|codec_type=video|stream_index=2|pts=0|pts_time=0.000000|dts=0|dts_time=0.000000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=233143|flags=K_
 frame|media_type=video|stream_index=2|key_frame=1|pkt_pts=0|pkt_pts_time=0.000000|pkt_dts=0|pkt_dts_time=0.000000|best_effort_timestamp=0|best_effort_timestamp_time=0.000000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=233143|pkt_size=30000|width=100|height=100|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
-packet|codec_type=audio|stream_index=0|pts=1024|pts_time=0.023220|dts=1024|dts_time=0.023220|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=263148|flags=K
+packet|codec_type=audio|stream_index=0|pts=1024|pts_time=0.023220|dts=1024|dts_time=0.023220|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=263148|flags=K_
 frame|media_type=audio|stream_index=0|key_frame=1|pkt_pts=1024|pkt_pts_time=0.023220|pkt_dts=1024|pkt_dts_time=0.023220|best_effort_timestamp=1024|best_effort_timestamp_time=0.023220|pkt_duration=1024|pkt_duration_time=0.023220|pkt_pos=263148|pkt_size=2048|sample_fmt=s16|nb_samples=1024|channels=1|channel_layout=unknown
-packet|codec_type=video|stream_index=1|pts=2048|pts_time=0.040000|dts=2048|dts_time=0.040000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=265226|flags=K
+packet|codec_type=video|stream_index=1|pts=2048|pts_time=0.040000|dts=2048|dts_time=0.040000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=265226|flags=K_
 frame|media_type=video|stream_index=1|key_frame=1|pkt_pts=2048|pkt_pts_time=0.040000|pkt_dts=2048|pkt_dts_time=0.040000|best_effort_timestamp=2048|best_effort_timestamp_time=0.040000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=265226|pkt_size=230400|width=320|height=240|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
-packet|codec_type=video|stream_index=2|pts=2048|pts_time=0.040000|dts=2048|dts_time=0.040000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=495650|flags=K
+packet|codec_type=video|stream_index=2|pts=2048|pts_time=0.040000|dts=2048|dts_time=0.040000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=495650|flags=K_
 frame|media_type=video|stream_index=2|key_frame=1|pkt_pts=2048|pkt_pts_time=0.040000|pkt_dts=2048|pkt_dts_time=0.040000|best_effort_timestamp=2048|best_effort_timestamp_time=0.040000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=495650|pkt_size=30000|width=100|height=100|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
-packet|codec_type=audio|stream_index=0|pts=2048|pts_time=0.046440|dts=2048|dts_time=0.046440|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=525655|flags=K
+packet|codec_type=audio|stream_index=0|pts=2048|pts_time=0.046440|dts=2048|dts_time=0.046440|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=525655|flags=K_
 frame|media_type=audio|stream_index=0|key_frame=1|pkt_pts=2048|pkt_pts_time=0.046440|pkt_dts=2048|pkt_dts_time=0.046440|best_effort_timestamp=2048|best_effort_timestamp_time=0.046440|pkt_duration=1024|pkt_duration_time=0.023220|pkt_pos=525655|pkt_size=2048|sample_fmt=s16|nb_samples=1024|channels=1|channel_layout=unknown
-packet|codec_type=audio|stream_index=0|pts=3072|pts_time=0.069660|dts=3072|dts_time=0.069660|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=527726|flags=K
+packet|codec_type=audio|stream_index=0|pts=3072|pts_time=0.069660|dts=3072|dts_time=0.069660|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=527726|flags=K_
 frame|media_type=audio|stream_index=0|key_frame=1|pkt_pts=3072|pkt_pts_time=0.069660|pkt_dts=3072|pkt_dts_time=0.069660|best_effort_timestamp=3072|best_effort_timestamp_time=0.069660|pkt_duration=1024|pkt_duration_time=0.023220|pkt_pos=527726|pkt_size=2048|sample_fmt=s16|nb_samples=1024|channels=1|channel_layout=unknown
-packet|codec_type=video|stream_index=1|pts=4096|pts_time=0.080000|dts=4096|dts_time=0.080000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=529804|flags=K
+packet|codec_type=video|stream_index=1|pts=4096|pts_time=0.080000|dts=4096|dts_time=0.080000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=529804|flags=K_
 frame|media_type=video|stream_index=1|key_frame=1|pkt_pts=4096|pkt_pts_time=0.080000|pkt_dts=4096|pkt_dts_time=0.080000|best_effort_timestamp=4096|best_effort_timestamp_time=0.080000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=529804|pkt_size=230400|width=320|height=240|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
-packet|codec_type=video|stream_index=2|pts=4096|pts_time=0.080000|dts=4096|dts_time=0.080000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=760228|flags=K
+packet|codec_type=video|stream_index=2|pts=4096|pts_time=0.080000|dts=4096|dts_time=0.080000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=760228|flags=K_
 frame|media_type=video|stream_index=2|key_frame=1|pkt_pts=4096|pkt_pts_time=0.080000|pkt_dts=4096|pkt_dts_time=0.080000|best_effort_timestamp=4096|best_effort_timestamp_time=0.080000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=760228|pkt_size=30000|width=100|height=100|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
-packet|codec_type=audio|stream_index=0|pts=4096|pts_time=0.092880|dts=4096|dts_time=0.092880|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=790233|flags=K
+packet|codec_type=audio|stream_index=0|pts=4096|pts_time=0.092880|dts=4096|dts_time=0.092880|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=790233|flags=K_
 frame|media_type=audio|stream_index=0|key_frame=1|pkt_pts=4096|pkt_pts_time=0.092880|pkt_dts=4096|pkt_dts_time=0.092880|best_effort_timestamp=4096|best_effort_timestamp_time=0.092880|pkt_duration=1024|pkt_duration_time=0.023220|pkt_pos=790233|pkt_size=2048|sample_fmt=s16|nb_samples=1024|channels=1|channel_layout=unknown
-packet|codec_type=audio|stream_index=0|pts=5120|pts_time=0.116100|dts=5120|dts_time=0.116100|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=792304|flags=K
+packet|codec_type=audio|stream_index=0|pts=5120|pts_time=0.116100|dts=5120|dts_time=0.116100|duration=1024|duration_time=0.023220|convergence_duration=N/A|convergence_duration_time=N/A|size=2048|pos=792304|flags=K_
 frame|media_type=audio|stream_index=0|key_frame=1|pkt_pts=5120|pkt_pts_time=0.116100|pkt_dts=5120|pkt_dts_time=0.116100|best_effort_timestamp=5120|best_effort_timestamp_time=0.116100|pkt_duration=1024|pkt_duration_time=0.023220|pkt_pos=792304|pkt_size=2048|sample_fmt=s16|nb_samples=1024|channels=1|channel_layout=unknown
-packet|codec_type=video|stream_index=1|pts=6144|pts_time=0.120000|dts=6144|dts_time=0.120000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=794382|flags=K
+packet|codec_type=video|stream_index=1|pts=6144|pts_time=0.120000|dts=6144|dts_time=0.120000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=230400|pos=794382|flags=K_
 frame|media_type=video|stream_index=1|key_frame=1|pkt_pts=6144|pkt_pts_time=0.120000|pkt_dts=6144|pkt_dts_time=0.120000|best_effort_timestamp=6144|best_effort_timestamp_time=0.120000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=794382|pkt_size=230400|width=320|height=240|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
-packet|codec_type=video|stream_index=2|pts=6144|pts_time=0.120000|dts=6144|dts_time=0.120000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=1024806|flags=K
+packet|codec_type=video|stream_index=2|pts=6144|pts_time=0.120000|dts=6144|dts_time=0.120000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=1024806|flags=K_
 frame|media_type=video|stream_index=2|key_frame=1|pkt_pts=6144|pkt_pts_time=0.120000|pkt_dts=6144|pkt_dts_time=0.120000|best_effort_timestamp=6144|best_effort_timestamp_time=0.120000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=1024806|pkt_size=30000|width=100|height=100|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
 stream|index=0|codec_name=pcm_s16le|profile=unknown|codec_type=audio|codec_time_base=1/44100|codec_tag_string=PSD[16]|codec_tag=0x10445350|sample_fmt=s16|sample_rate=44100|channels=1|channel_layout=unknown|bits_per_sample=16|id=N/A|r_frame_rate=0/0|avg_frame_rate=0/0|time_base=1/44100|start_pts=0|start_time=0.000000|duration_ts=N/A|duration=N/A|bit_rate=705600|max_bit_rate=N/A|bits_per_raw_sample=N/A|nb_frames=N/A|nb_read_frames=6|nb_read_packets=6|disposition:default=0|disposition:dub=0|disposition:original=0|disposition:comment=0|disposition:lyrics=0|disposition:karaoke=0|disposition:forced=0|disposition:hearing_impaired=0|disposition:visual_impaired=0|disposition:clean_effects=0|disposition:attached_pic=0|tag:E=mc²|tag:encoder=Lavc pcm_s16le
 stream|index=1|codec_name=rawvideo|profile=unknown|codec_type=video|codec_time_base=1/25|codec_tag_string=RGB[24]|codec_tag=0x18424752|width=320|height=240|coded_width=320|coded_height=240|has_b_frames=0|sample_aspect_ratio=1:1|display_aspect_ratio=4:3|pix_fmt=rgb24|level=-99|color_range=N/A|color_space=unknown|color_transfer=unknown|color_primaries=unknown|chroma_location=unspecified|timecode=N/A|refs=1|id=N/A|r_frame_rate=25/1|avg_frame_rate=25/1|time_base=1/51200|start_pts=0|start_time=0.000000|duration_ts=N/A|duration=N/A|bit_rate=N/A|max_bit_rate=N/A|bits_per_raw_sample=N/A|nb_frames=N/A|nb_read_frames=4|nb_read_packets=4|disposition:default=0|disposition:dub=0|disposition:original=0|disposition:comment=0|disposition:lyrics=0|disposition:karaoke=0|disposition:forced=0|disposition:hearing_impaired=0|disposition:visual_impaired=0|disposition:clean_effects=0|disposition:attached_pic=0|tag:title=foobar|tag:duration_ts=field-and-tags-conflict-attempt|tag:encoder=Lavc rawvideo
diff --git a/tests/ref/fate/ffprobe_csv b/tests/ref/fate/ffprobe_csv
index 882c1b8..c5bef51 100644
--- a/tests/ref/fate/ffprobe_csv
+++ b/tests/ref/fate/ffprobe_csv
@@ -1,30 +1,30 @@
-packet,audio,0,0,0.000000,0,0.000000,1024,0.023220,N/A,N/A,2048,647,K
+packet,audio,0,0,0.000000,0,0.000000,1024,0.023220,N/A,N/A,2048,647,K_
 frame,audio,0,1,0,0.000000,0,0.000000,0,0.000000,1024,0.023220,647,2048,s16,1024,1,unknown
-packet,video,1,0,0.000000,0,0.000000,2048,0.040000,N/A,N/A,230400,2722,K
+packet,video,1,0,0.000000,0,0.000000,2048,0.040000,N/A,N/A,230400,2722,K_
 frame,video,1,1,0,0.000000,0,0.000000,0,0.000000,2048,0.040000,2722,230400,320,240,rgb24,1:1,I,0,0,0,0,0
-packet,video,2,0,0.000000,0,0.000000,2048,0.040000,N/A,N/A,30000,233143,K
+packet,video,2,0,0.000000,0,0.000000,2048,0.040000,N/A,N/A,30000,233143,K_
 frame,video,2,1,0,0.000000,0,0.000000,0,0.000000,2048,0.040000,233143,30000,100,100,rgb24,1:1,I,0,0,0,0,0
-packet,audio,0,1024,0.023220,1024,0.023220,1024,0.023220,N/A,N/A,2048,263148,K
+packet,audio,0,1024,0.023220,1024,0.023220,1024,0.023220,N/A,N/A,2048,263148,K_
 frame,audio,0,1,1024,0.023220,1024,0.023220,1024,0.023220,1024,0.023220,263148,2048,s16,1024,1,unknown
-packet,video,1,2048,0.040000,2048,0.040000,2048,0.040000,N/A,N/A,230400,265226,K
+packet,video,1,2048,0.040000,2048,0.040000,2048,0.040000,N/A,N/A,230400,265226,K_
 frame,video,1,1,2048,0.040000,2048,0.040000,2048,0.040000,2048,0.040000,265226,230400,320,240,rgb24,1:1,I,0,0,0,0,0
-packet,video,2,2048,0.040000,2048,0.040000,2048,0.040000,N/A,N/A,30000,495650,K
+packet,video,2,2048,0.040000,2048,0.040000,2048,0.040000,N/A,N/A,30000,495650,K_
 frame,video,2,1,2048,0.040000,2048,0.040000,2048,0.040000,2048,0.040000,495650,30000,100,100,rgb24,1:1,I,0,0,0,0,0
-packet,audio,0,2048,0.046440,2048,0.046440,1024,0.023220,N/A,N/A,2048,525655,K
+packet,audio,0,2048,0.046440,2048,0.046440,1024,0.023220,N/A,N/A,2048,525655,K_
 frame,audio,0,1,2048,0.046440,2048,0.046440,2048,0.046440,1024,0.023220,525655,2048,s16,1024,1,unknown
-packet,audio,0,3072,0.069660,3072,0.069660,1024,0.023220,N/A,N/A,2048,527726,K
+packet,audio,0,3072,0.069660,3072,0.069660,1024,0.023220,N/A,N/A,2048,527726,K_
 frame,audio,0,1,3072,0.069660,3072,0.069660,3072,0.069660,1024,0.023220,527726,2048,s16,1024,1,unknown
-packet,video,1,4096,0.080000,4096,0.080000,2048,0.040000,N/A,N/A,230400,529804,K
+packet,video,1,4096,0.080000,4096,0.080000,2048,0.040000,N/A,N/A,230400,529804,K_
 frame,video,1,1,4096,0.080000,4096,0.080000,4096,0.080000,2048,0.040000,529804,230400,320,240,rgb24,1:1,I,0,0,0,0,0
-packet,video,2,4096,0.080000,4096,0.080000,2048,0.040000,N/A,N/A,30000,760228,K
+packet,video,2,4096,0.080000,4096,0.080000,2048,0.040000,N/A,N/A,30000,760228,K_
 frame,video,2,1,4096,0.080000,4096,0.080000,4096,0.080000,2048,0.040000,760228,30000,100,100,rgb24,1:1,I,0,0,0,0,0
-packet,audio,0,4096,0.092880,4096,0.092880,1024,0.023220,N/A,N/A,2048,790233,K
+packet,audio,0,4096,0.092880,4096,0.092880,1024,0.023220,N/A,N/A,2048,790233,K_
 frame,audio,0,1,4096,0.092880,4096,0.092880,4096,0.092880,1024,0.023220,790233,2048,s16,1024,1,unknown
-packet,audio,0,5120,0.116100,5120,0.116100,1024,0.023220,N/A,N/A,2048,792304,K
+packet,audio,0,5120,0.116100,5120,0.116100,1024,0.023220,N/A,N/A,2048,792304,K_
 frame,audio,0,1,5120,0.116100,5120,0.116100,5120,0.116100,1024,0.023220,792304,2048,s16,1024,1,unknown
-packet,video,1,6144,0.120000,6144,0.120000,2048,0.040000,N/A,N/A,230400,794382,K
+packet,video,1,6144,0.120000,6144,0.120000,2048,0.040000,N/A,N/A,230400,794382,K_
 frame,video,1,1,6144,0.120000,6144,0.120000,6144,0.120000,2048,0.040000,794382,230400,320,240,rgb24,1:1,I,0,0,0,0,0
-packet,video,2,6144,0.120000,6144,0.120000,2048,0.040000,N/A,N/A,30000,1024806,K
+packet,video,2,6144,0.120000,6144,0.120000,2048,0.040000,N/A,N/A,30000,1024806,K_
 frame,video,2,1,6144,0.120000,6144,0.120000,6144,0.120000,2048,0.040000,1024806,30000,100,100,rgb24,1:1,I,0,0,0,0,0
 stream,0,pcm_s16le,unknown,audio,1/44100,PSD[16],0x10445350,s16,44100,1,unknown,16,N/A,0/0,0/0,1/44100,0,0.000000,N/A,N/A,705600,N/A,N/A,N/A,6,6,0,0,0,0,0,0,0,0,0,0,0,mc²,Lavc pcm_s16le
 stream,1,rawvideo,unknown,video,1/25,RGB[24],0x18424752,320,240,320,240,0,1:1,4:3,rgb24,-99,N/A,unknown,unknown,unknown,unspecified,N/A,1,N/A,25/1,25/1,1/51200,0,0.000000,N/A,N/A,N/A,N/A,N/A,N/A,4,4,0,0,0,0,0,0,0,0,0,0,0,foobar,field-and-tags-conflict-attempt,Lavc rawvideo
diff --git a/tests/ref/fate/ffprobe_default b/tests/ref/fate/ffprobe_default
index 4adb330..35418d4 100644
--- a/tests/ref/fate/ffprobe_default
+++ b/tests/ref/fate/ffprobe_default
@@ -11,7 +11,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=647
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=audio
@@ -45,7 +45,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=2722
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
@@ -85,7 +85,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=233143
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
@@ -125,7 +125,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=263148
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=audio
@@ -159,7 +159,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=265226
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
@@ -199,7 +199,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=495650
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
@@ -239,7 +239,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=525655
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=audio
@@ -273,7 +273,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=527726
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=audio
@@ -307,7 +307,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=529804
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
@@ -347,7 +347,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=760228
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
@@ -387,7 +387,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=790233
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=audio
@@ -421,7 +421,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=792304
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=audio
@@ -455,7 +455,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=794382
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
@@ -495,7 +495,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=1024806
-flags=K
+flags=K_
 [/PACKET]
 [FRAME]
 media_type=video
diff --git a/tests/ref/fate/ffprobe_flat b/tests/ref/fate/ffprobe_flat
index 4b2c91a..f9755c2 100644
--- a/tests/ref/fate/ffprobe_flat
+++ b/tests/ref/fate/ffprobe_flat
@@ -10,7 +10,7 @@ packets_and_frames.packet.0.convergence_duration="N/A"
 packets_and_frames.packet.0.convergence_duration_time="N/A"
 packets_and_frames.packet.0.size="2048"
 packets_and_frames.packet.0.pos="647"
-packets_and_frames.packet.0.flags="K"
+packets_and_frames.packet.0.flags="K_"
 packets_and_frames.frame.0.media_type="audio"
 packets_and_frames.frame.0.stream_index=0
 packets_and_frames.frame.0.key_frame=1
@@ -40,7 +40,7 @@ packets_and_frames.packet.1.convergence_duration="N/A"
 packets_and_frames.packet.1.convergence_duration_time="N/A"
 packets_and_frames.packet.1.size="230400"
 packets_and_frames.packet.1.pos="2722"
-packets_and_frames.packet.1.flags="K"
+packets_and_frames.packet.1.flags="K_"
 packets_and_frames.frame.1.media_type="video"
 packets_and_frames.frame.1.stream_index=1
 packets_and_frames.frame.1.key_frame=1
@@ -76,7 +76,7 @@ packets_and_frames.packet.2.convergence_duration="N/A"
 packets_and_frames.packet.2.convergence_duration_time="N/A"
 packets_and_frames.packet.2.size="30000"
 packets_and_frames.packet.2.pos="233143"
-packets_and_frames.packet.2.flags="K"
+packets_and_frames.packet.2.flags="K_"
 packets_and_frames.frame.2.media_type="video"
 packets_and_frames.frame.2.stream_index=2
 packets_and_frames.frame.2.key_frame=1
@@ -112,7 +112,7 @@ packets_and_frames.packet.3.convergence_duration="N/A"
 packets_and_frames.packet.3.convergence_duration_time="N/A"
 packets_and_frames.packet.3.size="2048"
 packets_and_frames.packet.3.pos="263148"
-packets_and_frames.packet.3.flags="K"
+packets_and_frames.packet.3.flags="K_"
 packets_and_frames.frame.3.media_type="audio"
 packets_and_frames.frame.3.stream_index=0
 packets_and_frames.frame.3.key_frame=1
@@ -142,7 +142,7 @@ packets_and_frames.packet.4.convergence_duration="N/A"
 packets_and_frames.packet.4.convergence_duration_time="N/A"
 packets_and_frames.packet.4.size="230400"
 packets_and_frames.packet.4.pos="265226"
-packets_and_frames.packet.4.flags="K"
+packets_and_frames.packet.4.flags="K_"
 packets_and_frames.frame.4.media_type="video"
 packets_and_frames.frame.4.stream_index=1
 packets_and_frames.frame.4.key_frame=1
@@ -178,7 +178,7 @@ packets_and_frames.packet.5.convergence_duration="N/A"
 packets_and_frames.packet.5.convergence_duration_time="N/A"
 packets_and_frames.packet.5.size="30000"
 packets_and_frames.packet.5.pos="495650"
-packets_and_frames.packet.5.flags="K"
+packets_and_frames.packet.5.flags="K_"
 packets_and_frames.frame.5.media_type="video"
 packets_and_frames.frame.5.stream_index=2
 packets_and_frames.frame.5.key_frame=1
@@ -214,7 +214,7 @@ packets_and_frames.packet.6.convergence_duration="N/A"
 packets_and_frames.packet.6.convergence_duration_time="N/A"
 packets_and_frames.packet.6.size="2048"
 packets_and_frames.packet.6.pos="525655"
-packets_and_frames.packet.6.flags="K"
+packets_and_frames.packet.6.flags="K_"
 packets_and_frames.frame.6.media_type="audio"
 packets_and_frames.frame.6.stream_index=0
 packets_and_frames.frame.6.key_frame=1
@@ -244,7 +244,7 @@ packets_and_frames.packet.7.convergence_duration="N/A"
 packets_and_frames.packet.7.convergence_duration_time="N/A"
 packets_and_frames.packet.7.size="2048"
 packets_and_frames.packet.7.pos="527726"
-packets_and_frames.packet.7.flags="K"
+packets_and_frames.packet.7.flags="K_"
 packets_and_frames.frame.7.media_type="audio"
 packets_and_frames.frame.7.stream_index=0
 packets_and_frames.frame.7.key_frame=1
@@ -274,7 +274,7 @@ packets_and_frames.packet.8.convergence_duration="N/A"
 packets_and_frames.packet.8.convergence_duration_time="N/A"
 packets_and_frames.packet.8.size="230400"
 packets_and_frames.packet.8.pos="529804"
-packets_and_frames.packet.8.flags="K"
+packets_and_frames.packet.8.flags="K_"
 packets_and_frames.frame.8.media_type="video"
 packets_and_frames.frame.8.stream_index=1
 packets_and_frames.frame.8.key_frame=1
@@ -310,7 +310,7 @@ packets_and_frames.packet.9.convergence_duration="N/A"
 packets_and_frames.packet.9.convergence_duration_time="N/A"
 packets_and_frames.packet.9.size="30000"
 packets_and_frames.packet.9.pos="760228"
-packets_and_frames.packet.9.flags="K"
+packets_and_frames.packet.9.flags="K_"
 packets_and_frames.frame.9.media_type="video"
 packets_and_frames.frame.9.stream_index=2
 packets_and_frames.frame.9.key_frame=1
@@ -346,7 +346,7 @@ packets_and_frames.packet.10.convergence_duration="N/A"
 packets_and_frames.packet.10.convergence_duration_time="N/A"
 packets_and_frames.packet.10.size="2048"
 packets_and_frames.packet.10.pos="790233"
-packets_and_frames.packet.10.flags="K"
+packets_and_frames.packet.10.flags="K_"
 packets_and_frames.frame.10.media_type="audio"
 packets_and_frames.frame.10.stream_index=0
 packets_and_frames.frame.10.key_frame=1
@@ -376,7 +376,7 @@ packets_and_frames.packet.11.convergence_duration="N/A"
 packets_and_frames.packet.11.convergence_duration_time="N/A"
 packets_and_frames.packet.11.size="2048"
 packets_and_frames.packet.11.pos="792304"
-packets_and_frames.packet.11.flags="K"
+packets_and_frames.packet.11.flags="K_"
 packets_and_frames.frame.11.media_type="audio"
 packets_and_frames.frame.11.stream_index=0
 packets_and_frames.frame.11.key_frame=1
@@ -406,7 +406,7 @@ packets_and_frames.packet.12.convergence_duration="N/A"
 packets_and_frames.packet.12.convergence_duration_time="N/A"
 packets_and_frames.packet.12.size="230400"
 packets_and_frames.packet.12.pos="794382"
-packets_and_frames.packet.12.flags="K"
+packets_and_frames.packet.12.flags="K_"
 packets_and_frames.frame.12.media_type="video"
 packets_and_frames.frame.12.stream_index=1
 packets_and_frames.frame.12.key_frame=1
@@ -442,7 +442,7 @@ packets_and_frames.packet.13.convergence_duration="N/A"
 packets_and_frames.packet.13.convergence_duration_time="N/A"
 packets_and_frames.packet.13.size="30000"
 packets_and_frames.packet.13.pos="1024806"
-packets_and_frames.packet.13.flags="K"
+packets_and_frames.packet.13.flags="K_"
 packets_and_frames.frame.13.media_type="video"
 packets_and_frames.frame.13.stream_index=2
 packets_and_frames.frame.13.key_frame=1
diff --git a/tests/ref/fate/ffprobe_ini b/tests/ref/fate/ffprobe_ini
index ba59d61..472ec72 100644
--- a/tests/ref/fate/ffprobe_ini
+++ b/tests/ref/fate/ffprobe_ini
@@ -13,7 +13,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=647
-flags=K
+flags=K_
 
 [packets_and_frames.frame.0]
 media_type=audio
@@ -47,7 +47,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=2722
-flags=K
+flags=K_
 
 [packets_and_frames.frame.1]
 media_type=video
@@ -87,7 +87,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=233143
-flags=K
+flags=K_
 
 [packets_and_frames.frame.2]
 media_type=video
@@ -127,7 +127,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=263148
-flags=K
+flags=K_
 
 [packets_and_frames.frame.3]
 media_type=audio
@@ -161,7 +161,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=265226
-flags=K
+flags=K_
 
 [packets_and_frames.frame.4]
 media_type=video
@@ -201,7 +201,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=495650
-flags=K
+flags=K_
 
 [packets_and_frames.frame.5]
 media_type=video
@@ -241,7 +241,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=525655
-flags=K
+flags=K_
 
 [packets_and_frames.frame.6]
 media_type=audio
@@ -275,7 +275,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=527726
-flags=K
+flags=K_
 
 [packets_and_frames.frame.7]
 media_type=audio
@@ -309,7 +309,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=529804
-flags=K
+flags=K_
 
 [packets_and_frames.frame.8]
 media_type=video
@@ -349,7 +349,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=760228
-flags=K
+flags=K_
 
 [packets_and_frames.frame.9]
 media_type=video
@@ -389,7 +389,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=790233
-flags=K
+flags=K_
 
 [packets_and_frames.frame.10]
 media_type=audio
@@ -423,7 +423,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=2048
 pos=792304
-flags=K
+flags=K_
 
 [packets_and_frames.frame.11]
 media_type=audio
@@ -457,7 +457,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=230400
 pos=794382
-flags=K
+flags=K_
 
 [packets_and_frames.frame.12]
 media_type=video
@@ -497,7 +497,7 @@ convergence_duration=N/A
 convergence_duration_time=N/A
 size=30000
 pos=1024806
-flags=K
+flags=K_
 
 [packets_and_frames.frame.13]
 media_type=video
diff --git a/tests/ref/fate/ffprobe_json b/tests/ref/fate/ffprobe_json
index 8d7abda..e9ef1f0 100644
--- a/tests/ref/fate/ffprobe_json
+++ b/tests/ref/fate/ffprobe_json
@@ -12,7 +12,7 @@
             "duration_time": "0.023220",
             "size": "2048",
             "pos": "647",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -45,7 +45,7 @@
             "duration_time": "0.040000",
             "size": "230400",
             "pos": "2722",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -85,7 +85,7 @@
             "duration_time": "0.040000",
             "size": "30000",
             "pos": "233143",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -125,7 +125,7 @@
             "duration_time": "0.023220",
             "size": "2048",
             "pos": "263148",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -158,7 +158,7 @@
             "duration_time": "0.040000",
             "size": "230400",
             "pos": "265226",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -198,7 +198,7 @@
             "duration_time": "0.040000",
             "size": "30000",
             "pos": "495650",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -238,7 +238,7 @@
             "duration_time": "0.023220",
             "size": "2048",
             "pos": "525655",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -271,7 +271,7 @@
             "duration_time": "0.023220",
             "size": "2048",
             "pos": "527726",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -304,7 +304,7 @@
             "duration_time": "0.040000",
             "size": "230400",
             "pos": "529804",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -344,7 +344,7 @@
             "duration_time": "0.040000",
             "size": "30000",
             "pos": "760228",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -384,7 +384,7 @@
             "duration_time": "0.023220",
             "size": "2048",
             "pos": "790233",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -417,7 +417,7 @@
             "duration_time": "0.023220",
             "size": "2048",
             "pos": "792304",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -450,7 +450,7 @@
             "duration_time": "0.040000",
             "size": "230400",
             "pos": "794382",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
@@ -490,7 +490,7 @@
             "duration_time": "0.040000",
             "size": "30000",
             "pos": "1024806",
-            "flags": "K"
+            "flags": "K_"
         },
         {
             "type": "frame",
diff --git a/tests/ref/fate/ffprobe_xml b/tests/ref/fate/ffprobe_xml
index b51b0c6..4639a23 100644
--- a/tests/ref/fate/ffprobe_xml
+++ b/tests/ref/fate/ffprobe_xml
@@ -1,33 +1,33 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <ffprobe>
     <packets_and_frames>
-        <packet codec_type="audio" stream_index="0" pts="0" pts_time="0.000000" dts="0" dts_time="0.000000" duration="1024" duration_time="0.023220" size="2048" pos="647" flags="K"/>
+        <packet codec_type="audio" stream_index="0" pts="0" pts_time="0.000000" dts="0" dts_time="0.000000" duration="1024" duration_time="0.023220" size="2048" pos="647" flags="K_"/>
         <frame media_type="audio" stream_index="0" key_frame="1" pkt_pts="0" pkt_pts_time="0.000000" pkt_dts="0" pkt_dts_time="0.000000" best_effort_timestamp="0" best_effort_timestamp_time="0.000000" pkt_duration="1024" pkt_duration_time="0.023220" pkt_pos="647" pkt_size="2048" sample_fmt="s16" nb_samples="1024" channels="1"/>
-        <packet codec_type="video" stream_index="1" pts="0" pts_time="0.000000" dts="0" dts_time="0.000000" duration="2048" duration_time="0.040000" size="230400" pos="2722" flags="K"/>
+        <packet codec_type="video" stream_index="1" pts="0" pts_time="0.000000" dts="0" dts_time="0.000000" duration="2048" duration_time="0.040000" size="230400" pos="2722" flags="K_"/>
         <frame media_type="video" stream_index="1" key_frame="1" pkt_pts="0" pkt_pts_time="0.000000" pkt_dts="0" pkt_dts_time="0.000000" best_effort_timestamp="0" best_effort_timestamp_time="0.000000" pkt_duration="2048" pkt_duration_time="0.040000" pkt_pos="2722" pkt_size="230400" width="320" height="240" pix_fmt="rgb24" sample_aspect_ratio="1:1" pict_type="I" coded_picture_number="0" display_picture_number="0" interlaced_frame="0" top_field_first="0" repeat_pict="0"/>
-        <packet codec_type="video" stream_index="2" pts="0" pts_time="0.000000" dts="0" dts_time="0.000000" duration="2048" duration_time="0.040000" size="30000" pos="233143" flags="K"/>
+        <packet codec_type="video" stream_index="2" pts="0" pts_time="0.000000" dts="0" dts_time="0.000000" duration="2048" duration_time="0.040000" size="30000" pos="233143" flags="K_"/>
         <frame media_type="video" stream_index="2" key_frame="1" pkt_pts="0" pkt_pts_time="0.000000" pkt_dts="0" pkt_dts_time="0.000000" best_effort_timestamp="0" best_effort_timestamp_time="0.000000" pkt_duration="2048" pkt_duration_time="0.040000" pkt_pos="233143" pkt_size="30000" width="100" height="100" pix_fmt="rgb24" sample_aspect_ratio="1:1" pict_type="I" coded_picture_number="0" display_picture_number="0" interlaced_frame="0" top_field_first="0" repeat_pict="0"/>
-        <packet codec_type="audio" stream_index="0" pts="1024" pts_time="0.023220" dts="1024" dts_time="0.023220" duration="1024" duration_time="0.023220" size="2048" pos="263148" flags="K"/>
+        <packet codec_type="audio" stream_index="0" pts="1024" pts_time="0.023220" dts="1024" dts_time="0.023220" duration="1024" duration_time="0.023220" size="2048" pos="263148" flags="K_"/>
         <frame media_type="audio" stream_index="0" key_frame="1" pkt_pts="1024" pkt_pts_time="0.023220" pkt_dts="1024" pkt_dts_time="0.023220" best_effort_timestamp="1024" best_effort_timestamp_time="0.023220" pkt_duration="1024" pkt_duration_time="0.023220" pkt_pos="263148" pkt_size="2048" sample_fmt="s16" nb_samples="1024" channels="1"/>
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