Re: [FFmpeg-devel] avformat/mxfenc: SMPTE RDD 48:2018 Amd 1:2022 (FFV1 in MXF) support

["Tomas Härdin" <git@haerdin.se>]

lör 2023-01-14 klockan 16:45 +0100 skrev Jerome Martinez:
> The arbitrary short element codes are the ones used by another muxer
> ( 
> files available at 
> https://www.digitizationguidelines.gov/guidelines/MXF_app_sampleFiles.html#2022
>  
> )
> 
> The support of RGBA descriptor is added, mainly by disabling in the
> CDCI 
> descriptor related code the elements not in the Generic picture 
> descriptor, and could be in a separated dedicated patch (move of
> Generic 
> picture descriptor code in a dedicated function?).
> 
> Tested with:
> ffmpeg -f lavfi -i testsrc=duration=10:size=ntsc:rate=ntsc -
> field_order 
> bb -c:v ffv1 -level 0 test_ffv1_ntsc.mxf
> ffmpeg -f lavfi -i testsrc=duration=10:size=pal:rate=pal -field_order
> tt 
> -c:v ffv1 -level 3 test_ffv1_pal.mxf
> ffmpeg -f lavfi -i testsrc=duration=10:size=1920x1080 -pix_fmt
> yuv422p10 
> -c:v ffv1 -level 3 test_ffv1_hd.mxf

JPEG2000 will also need an RGBA descriptor filled out, might be good to
prepare for that.

The ffv1 parsing code in this patch makes me nervous. Isn't the version
available in metadata?

> +        ff_build_rac_states(&c, 0.05 * (1LL << 32), 256 - 8);

(1LL << 32) / 20 ?

/Tomas

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