MXF IBBP To MXF I frame only

[zahoor]

Hi. I use edius 7.53 and the proxy files are encodede with mxf mpeg2 352x288 with M and N settings, aspect ratio is 1.222 and it's OP1a format. Even though they are proxies I still struggle to play them smoothly in multicam scenarios. Is there a way to covert these using FFMpeg so that they are all I frame with no other attributes change. PS normal encoders that export MPEG2 do not recognize the file as a valid proxy. Maybe Edius is very fussy about these things.
Can anyone help? Thanks

[poisondeathray]

Hi. I use edius 7.53 and the proxy files are encodede with mxf mpeg2 352x288 with M and N settings, aspect ratio is 1.222 and it's OP1a format. Even though they are proxies I still struggle to play them smoothly in multicam scenarios. Is there a way to covert these using FFMpeg so that they are all I frame with no other attributes change. PS normal encoders that export MPEG2 do not recognize the file as a valid proxy. Maybe Edius is very fussy about these things.
Can anyone help? Thanks

What are the other attributes ? ffmpeg does not necessarily copy all attributes automatically, some you have to enter

-g 1 would be I-frame in ffmpeg

It would look something like this, but you have not given the other attributes

ffmpeg -i input.mxf -c:v mpeg2video -q:v 4 -g 1 -c:a copy output.mxf

[zahoor]

I examined the original and processed clips , spent about 2 days examining different attributes of the files and the ones that vary that I have no control over are
a) Format version (1.2 in edius and 1.3 in all the others)
b) Timecode attributes
c) the writing application.

For info I have included all the detailed attributes, The main ones (as reported by windows media player ) are the same in both clips.

The detailed ones are
General
Format : MXF
Format version : 1.2
Format profile : OP-1a
Format settings : Open / Complete
File size : 3.12 MiB
Duration : 23 s 520 ms
Overall bit rate mode : Variable
Overall bit rate : 1 114 kb/s
Encoded date : 2021-02-26 17:11:57.064
Writing application : Grass Valley K.K. EDIUS 7.0

Video
ID : 2
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings, BVOP : Yes
Format settings, Matrix : Custom
Format settings, GOP : M=3, N=15
Format settings, wrapping mode : Frame
Codec ID : 0D01030102046001-0401020201011100
Duration : 23 s 520 ms
Bit rate mode : Variable
Bit rate : 1 000 kb/s
Width : 352 pixels
Height : 288 pixels
Display aspect ratio : 1.222
Original display aspect ratio : 16:9
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.395
Time code of first frame : 06:12:16:23
Time code source : Group of pictures header
GOP, Open/Closed : Open
GOP, Open/Closed of first fram : Closed
Stream size : 2.80 MiB (90%)

Audio
ID : 3
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Format settings, wrapping mode : Frame
Codec ID : 0D01030102044001-0402020203020500
Duration : 23 s 520 ms
Bit rate mode : Constant
Bit rate : 64.0 kb/s
Channel(s) : 2 channels
Sampling rate : 48.0 kHz
Frame rate : 25.000 FPS (1920 SPF)
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 184 KiB (6%)
Locked : Yes

Other #1
ID : 1-Material
Type : Time code
Format : MXF TC
Time code of first frame : 06:12:16:23
Time code settings : Material Package
Time code, striped : Yes

Other #2
ID : 1-Source
Type : Time code
Format : MXF TC
Time code of first frame : 06:12:16:23
Time code settings : Source Package
Time code, striped : Yes

Other #3
Type : Time code
Format : SMPTE TC
Muxing mode : SDTI
Time code of first frame : 06:12:16:23

[zahoor]

and Thasnk you for your help