fate/id3v2: Add a test for remuxing id3v2 private tags

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

tests/fate/id3v2.mak

@@ -1,5 +1,11 @@
-FATE_SAMPLES_ID3V2-$(CONFIG_MP3_DEMUXER) += fate-id3v2-priv
+FATE_ID3V2_FFPROBE-$(CONFIG_MP3_DEMUXER) += fate-id3v2-priv
 fate-id3v2-priv: CMD = probetags $(TARGET_SAMPLES)/id3v2/id3v2_priv.mp3
 
-FATE_SAMPLES_FFPROBE += $(FATE_SAMPLES_ID3V2-yes)
-fate-id3v2: $(FATE_SAMPLES_ID3V2-yes)
+FATE_ID3V2_FFMPEG_FFPROBE-$(call ALLYES, FILE_PROTOCOL MP3_DEMUXER MP3_MUXER \
+                                         FRAMECRC_MUXER PIPE_PROTOCOL)       \
+                            += fate-id3v2-priv-remux
+fate-id3v2-priv-remux: CMD = transcode mp3 $(TARGET_SAMPLES)/id3v2/id3v2_priv.mp3 mp3 "-c copy" "-c copy -t 0.1" "" "-show_entries format_tags"
+
+FATE_SAMPLES_FFPROBE        += $(FATE_ID3V2_FFPROBE-yes)
+FATE_SAMPLES_FFMPEG_FFPROBE += $(FATE_ID3V2_FFMPEG_FFPROBE-yes)
+fate-id3v2: $(FATE_ID3V2_FFPROBE-yes) $(FATE_ID3V2_FFMPEG_FFPROBE-yes)

tests/ref/fate/id3v2-priv-remux

@@ -0,0 +1,18 @@
+3e99254aa892a9578ce31da17b012a44 *tests/data/fate/id3v2-priv-remux.mp3
+8542 tests/data/fate/id3v2-priv-remux.mp3
+#tb 0: 1/14112000
+#media_type 0: audio
+#codec_id 0: mp3
+#sample_rate 0: 48000
+#channel_layout 0: 4
+#channel_layout_name 0: mono
+0,    -155528,    -155528,   338688,      192, 0x3774510e, S=1,       10, 0x00bc0013
+0,     183160,     183160,   338688,      192, 0x856c5b02
+0,     521848,     521848,   338688,      192, 0xb86e557f
+0,     860536,     860536,   338688,      192, 0x3b6c5cb7
+0,    1199224,    1199224,   338688,      192, 0xe1bc5c76
+[FORMAT]
+TAG:title=id3v2-test
+TAG:id3v2_priv.testowner2=\x00\x01\x02
+TAG:id3v2_priv.testowner=testdata
+[/FORMAT]