[FFmpeg-user] How to set 3 specific metadata flags (ITU601/displayoffset) in FFmpegs IMX50 MXF-OP1a encoding?

[Christoph Gerstbauer]

>> Hello Tim!
>> thank you, it works for PAL and NTSC (720x512/720x480) but there is a
>> just little bug for NTSC when encoding to 720x486 in "stored dimension"!
> My patch only deals with the addition of the display y offset metadata,
> it should not touch exisiting metadata, are you saying that the figures
> for 'Stored dimensions' are different with and without my patch?
>

Hello Tim, you are right.
I tried it with a non-patched ffmpeg version, and I got the same result:

MXF File Information:
   Filename                   : I:\IMX_tests\IMX50_FFMPEG_NTSC_NEW.mxf
   MXF version                : 1.2
   OP label                   : OP-1A (internal essence, stream file, 
multi-track)
   Wrapping type              : Frame
   Material package name      :
   Material start timecode    : 00:00:00:00 (@ 30fps)
   File src start timecode    : 00:00:00:00 (@ 30fps)
   Edit rate                  : 30000/1001
   Precharge                  : 0
   Duration                   : 599
   Rollout                    : 0
   Identifications            :
     Identification 0:
       Generation UID    : adab4424.2f254dc7.92ff29bd.000c0001
       Company name      : FFmpeg
       Product name      : OP1a Muxer
       Product version   : (not set)
       Version string    : 56.25.101
       Product UID       : adab4424.2f254dc7.92ff29bd.000c0002
       Modification date : 0-00-00 00:00:00.000
       Toolkit version   : (not set)
       Platform          : (not set)
Track 0:
   Essence kind         : Picture
   Essence type         : D10 50Mbps
   Essence label        : 060e2b34.04010101.0d010301.02010201
   Material package uid : 
060a2b34.01010105.01010d00.13c0abba.52947134.3ec0abba.00529471.343ec000
   Material track id    : 2
   Material track number: 0
   File package uid     : 
060a2b34.01010105.01010d00.13c0abba.52947134.3ec0abba.00529471.343ec001
   File track id        : 2
   File track number    : 0x05010100
   Edit rate            : 30000/1001
   Duration             : 599
   Lead filler offset   : 0
   Picture coding label : 060e2b34.04010101.04010202.01020102
   Signal standard      : 0 (None)
   Frame layout         : 1 (Separate Fields)
   Stored dimensions    : 720x496
   Display dimensions   : 720x486
   Display x offset     : 0
   Display y offset     : 0
   Aspect ratio         : 4/3
   AFD                  : (not set)
   Component depth      : 8
   Horiz subsampling    : 2
   Vert subsampling     : 1
   Color siting         : 255 (Unknown)

Used syntax:
ffmpegnew -i <inputfile.avi> -map 0:v -map 0:a -c:v mpeg2video -r 29.97 
-pix_fmt yuv422p -aspect 4:3 -minrate 50000k -maxrate 50000k -b:v 50000k 
-intra -flags +ildct+low_del
ay -intra_vlc 1 -non_linear_quant 1 -ps 1 -qmin 1 -qmax 3 -top 1 -dc 10 
-bufsize 2000000 -rc_init_occupancy 2000000 -rc_max_vbv_use 1 
-rc_min_vbv_use 1 -c:a pcm_s24le -ar 48000 -f mxf_d10 -s 720x486 
<outputfile.mxf>


Best Regards
Christoph