Since there is no information about the source format, "unspecified"
is the correct value to write here.
---
 libavcodec/mpeg12enc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mpeg12enc.c b/libavcodec/mpeg12enc.c
index 103f3aaa7..406950901 100644
--- a/libavcodec/mpeg12enc.c
+++ b/libavcodec/mpeg12enc.c
@@ -297,7 +297,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
 
             put_header(s, EXT_START_CODE);
             put_bits(&s->pb, 4, 2);                         // sequence 
display extension
-            put_bits(&s->pb, 3, 0);                         // video_format: 0 
is components
+            put_bits(&s->pb, 3, 5);                         // video_format: 5 
is unspecified
             put_bits(&s->pb, 1, 1);                         // 
colour_description
             put_bits(&s->pb, 8, s->avctx->color_primaries); // colour_primaries
             put_bits(&s->pb, 8, s->avctx->color_trc);       // 
transfer_characteristics
-- 
2.11.0
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