A lax or tolerant decoder may support an End Sequence between fields of the same
frame but the spec. says this is not allowed.
2012 spec. 10.3.2, 2017 spec. 10.4.3:
Where pictures are fields, a sequence shall comprise a whole number of
frames (i.e., an even number of fields) and shall begin and end with a
whole frame/field-pair.
---
libavcodec/vc2enc.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/libavcodec/vc2enc.c b/libavcodec/vc2enc.c
index b7adcd3d36..9a5a4765c8 100644
--- a/libavcodec/vc2enc.c
+++ b/libavcodec/vc2enc.c
@@ -988,7 +988,13 @@ static int encode_frame(VC2EncContext *s, AVPacket *avpkt,
const AVFrame *frame,
encode_slices(s);
/* End sequence */
- encode_parse_info(s, DIRAC_PCODE_END_SEQ);
+ /* 2012 spec. 10.3.2, 2017 spec. 10.4.3:
+ * Where pictures are fields, a sequence shall comprise a whole number of
+ * frames (i.e., an even number of fields) and shall begin and end with a
+ * whole frame/field-pair. */
+ if (field != 1) {
+ encode_parse_info(s, DIRAC_PCODE_END_SEQ);
+ }
return 0;
}
--
2.16.1
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