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new 6092f060f4 avcodec/h264_parser: align field_order default with the
decoder
6092f060f4 is described below
commit 6092f060f431f587b3d619a36d9b9d5f963d8b57
Author: Nicolas Gaullier <[email protected]>
AuthorDate: Thu Aug 13 17:00:42 2026 +0200
Commit: James Almer <[email protected]>
CommitDate: Fri Aug 14 13:39:48 2026 +0000
avcodec/h264_parser: align field_order default with the decoder
Use case: interlaced AVC Intra is typically missing the required information
for proper tff detection.
Currently, the decoder defaults to tff, but the parser defaults to
progressive.
./ffmpeg -f lavfi -i testsrc=1920x1080 -codec libx264 -pix_fmt yuv422p10le \
-x264-params avcintra-class=100:tff=1 -frames 1 tff.h264
./ffprobe tff.h264 -of flat -show_entries
stream=field_order:frame=interlaced_frame,top_field_first
Before:
frames.frame.0.interlaced_frame=1
frames.frame.0.top_field_first=1
streams.stream.0.field_order="progressive"
After:
frames.frame.0.interlaced_frame=1
frames.frame.0.top_field_first=1
streams.stream.0.field_order="tt"
Issue since field_order setting in 3f1a7ceb2c604deff.
Signed-off-by: Nicolas Gaullier <[email protected]>
---
libavcodec/h264_parser.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index 9d64fc603f..af43cad609 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -423,6 +423,7 @@ static inline int parse_nal_units(AVCodecParserContext *s,
if (sps->frame_mbs_only_flag) {
p->picture_structure = PICT_FRAME;
+ s->field_order = AV_FIELD_PROGRESSIVE;
} else {
if (get_bits1(&nal.gb)) { // field_pic_flag
p->picture_structure = PICT_TOP_FIELD +
get_bits1(&nal.gb); // bottom_field_flag
@@ -541,8 +542,11 @@ static inline int parse_nal_units(AVCodecParserContext *s,
s->field_order = AV_FIELD_TT;
else if (field_poc[0] > field_poc[1])
s->field_order = AV_FIELD_BB;
- else
- s->field_order = AV_FIELD_PROGRESSIVE;
+ else if (sps->mb_aff) {
+ /* Default to top field first
+ * This is the same as what the decoder does */
+ s->field_order = AV_FIELD_TT;
+ }
}
} else {
if (p->picture_structure == PICT_TOP_FIELD)
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