Section 6.10.1 of the AV1 spec states:

It is a requirement of bitstream conformance that the value of tg_end is 
greater than or equal to tg_start.

Signed-off-by: James Almer <jamr...@gmail.com>
---
 libavcodec/cbs_av1_syntax_template.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/cbs_av1_syntax_template.c 
b/libavcodec/cbs_av1_syntax_template.c
index 2df5619279..63b4db7853 100644
--- a/libavcodec/cbs_av1_syntax_template.c
+++ b/libavcodec/cbs_av1_syntax_template.c
@@ -1785,7 +1785,7 @@ static int FUNC(tile_group_obu)(CodedBitstreamContext 
*ctx, RWContext *rw,
         tile_bits = cbs_av1_tile_log2(1, priv->tile_cols) +
                     cbs_av1_tile_log2(1, priv->tile_rows);
         fb(tile_bits, tg_start);
-        fb(tile_bits, tg_end);
+        fc(tile_bits, tg_end, current->tg_start, MAX_UINT_BITS(tile_bits));
     }
 
     CHECK(FUNC(byte_alignment)(ctx, rw));
-- 
2.28.0

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