On 11.10.2016 10:40, Tobias Rapp wrote:
Read video_line_map from MXF generic picture essence descriptor and use
it to derive the coded field order. Use field_dominance to derive the
display field order from coded field order. If field_dominance is not
available the default value "1" is used as defined in SMPTE S377-1.

Fixes field_order detection for a bunch of DV/DVCPRO files. The heuristic
for deriving coded field order from video_line_map is inspired by

Signed-off-by: Tobias Rapp <t.r...@noa-archive.com>
 libavformat/mxfdec.c | 75 +++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 60 insertions(+), 15 deletions(-)

Ping. Example files can be found at [1]. To debug the detected field order I used ffprobe plus the patch in [2]:

./ffprobe -show_streams -select_streams v -i $INPUT_FILE 2>/dev/null | grep field_order

For file "Avid-00005.mxf" [3] the result is:
field_order=tt (without patch)
field_order=bb (with patch)

For file "OpenCube-00003.mxf" [4] the result is:
field_order=unknown (without patch)
field_order=bb (with patch)


[1] http://mxf.irt.de/files/filter.php?action=query&filter=manufacturers
[2] https://ffmpeg.org/pipermail/ffmpeg-devel/2016-October/200607.html
[3] http://mxf.irt.de/files/download.php?action=getFile&repository=manufacturers&id=85 [4] http://mxf.irt.de/files/download.php?action=getFile&repository=manufacturers&id=114

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