Hello
I am testing with ffmpeg the IMX50 D10 encoding, and I am very close to
my target but I have to create 3 metadata values in the MXF header which
is standard in most IMX50 MXF ecndodings:
+ SIGNAL STANDARD = 1 (ITU 601)
+ display y offset = 32 - I am encoding 720x608 sources with included
VBI area (32 lines high at the top) -> the offset 32 defines the active
picture -> 720x576
+ Color siting = 4 (Rec 601)
Is it possible to encoded with ffmpeg in a way that these values can be
written?
If yes, which syntax should I add to my used syntax?
If no, could the option be implemented in future?
My used ffmpeg syntax is:
ffmpeg -i <inputfile> -map 0:v -map 0:a -c:v mpeg2video -r 25 -pix_fmt
yuv422p -aspect 4:3 -minrate 50000k -maxrate 50000k -b:v 50000k -intra
-flags +ildct+ilme+low_delay -intra_vlc 1 -non_linear_quant 1 -ps 1
-qmin 1 -qmax 3 -top 1 -dc 10 -bufsize 2000000 -rc_init_occupancy
2000000 -rc_buf_aggressivity 0.25 -tag:v mx5p -c:a pcm_s24le -ar 48000
-f mxf_d10 <outpufile.mxf>
I check the MXF metadata with BMX mxf2raw.exe (BBC)
I use 2 examples:
1.) a ffmpeg encoded MXF and
2.) a MXF from the Carbon Coder (Rhozet).
The carbon Coder playout shows me the wanted values:
C:\Users\gersti>mxf2raw -i I:\IMX_tests\IMX50_CARBON.mxf
MXF File Information:
Filename : I:\IMX_tests\IMX50_CARBON.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 (@ 25fps)
File src start timecode : 00:00:00:00 (@ 25fps)
Edit rate : 25/1
Precharge : 0
Duration : 500
Rollout : 0
Identifications :
Identification 0:
Generation UID : 10e5dae5.54663246.8c411484.8c2015e4
Company name : Rhozet
Product name : Carbon
Product version : (not set)
Version string : 1.1
Product UID : 842d0e07.eb104da4.b6d1c16b.bfdf797b
Modification date : 2015-02-03 13:39:02.000
Toolkit version : (not set)
Platform : (not set)
Track 0:
Essence kind : Picture
Essence type : D10 50Mbps
Essence label : 060e2b34.04010101.0d010301.02010101
Material package uid :
060a2b34.01010105.01010d20.13000000.d403bb57.8f86e749.9a0e3118.abce6ab9
Material track id : 2
Material track number: 0
File package uid :
060a2b34.01010105.01010d20.13000000.09464eb5.53deb944.9566c38d.b95db9fd
File track id : 2
File track number : 0x05010100
Edit rate : 25/1
Duration : 500
Lead filler offset : 0
Picture coding label : 060e2b34.04010101.04010202.01020101
Signal standard : 1 (ITU 601)
Frame layout : 1 (Separate Fields)
Stored dimensions : 720x608
Display dimensions : 720x576
Display x offset : 0
Display y offset : 32
Aspect ratio : 4/3
AFD : (not set)
Component depth : 8
Horiz subsampling : 2
Vert subsampling : 1
Color siting : 4 (Rec 601)
The FFMPEG MXF looks like this (the 3 values are not set correctly):
C:\Users\gersti>mxf2raw -i I:\IMX_tests\IMX50_FFMPEG.mxf
MXF File Information:
Filename : I:\IMX_tests\IMX50_FFMPEG.mxf
MXF version : 1.2
OP label : OP-1A (internal essence, stream file,
multi-track)
Wrapping type : Frame
Material package name :
Material start timecode : 10:00:00:00 (@ 25fps)
File src start timecode : 10:00:00:00 (@ 25fps)
Edit rate : 25/1
Precharge : 0
Duration : 750
Rollout : 0
Identifications :
Identification 0:
Generation UID : adab4424.2f254dc7.92ff29bd.000b0001
Company name : FFmpeg
Product name : OP1a Muxer
Product version : (not set)
Version string : 55.48.101
Product UID : adab4424.2f254dc7.92ff29bd.000b0002
Modification date : 0-00-00 00:00:00.000
Toolkit version : (not set)
Platform : (not set)
Track 0:
Essence kind : Picture
Essence type : picture essence
Essence label : 060e2b34.04010102.0d010301.02046001
Material package uid :
060a2b34.01010105.01010d00.1387b014.52947134.7187b014.00529471.34718700
Material track id : 2
Material track number: 0
File package uid :
060a2b34.01010105.01010d00.1387b014.52947134.7187b014.00529471.34718701
File track id : 2
File track number : 0x15010500
Edit rate : 25/1
Duration : 750
Lead filler offset : 0
Picture coding label : 060e2b34.04010103.04010202.01020200
Signal standard : 0 (None)
Frame layout : 1 (Separate Fields)
Stored dimensions : 720x608
Display dimensions : 720x576
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)
Best Regards
Christoph
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