avformat/movenc: encode compilation metadata

Fixes ticket #2960.

Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/movenc.c

@@ -2242,6 +2242,7 @@ static int mov_write_ilst_tag(AVIOContext *pb, MOVMuxContext *mov,
     mov_write_int8_metadata  (s, pb, "stik",    "media_type",1);
     mov_write_int8_metadata  (s, pb, "hdvd",    "hd_video",  1);
     mov_write_int8_metadata  (s, pb, "pgap",    "gapless_playback",1);
+    mov_write_int8_metadata  (s, pb, "cpil",    "compilation", 1);
     mov_write_trkn_tag(pb, mov, s, 0); // track number
     mov_write_trkn_tag(pb, mov, s, 1); // disc number
     mov_write_tmpo_tag(pb, s);