[FFmpeg-user] Repeatable resolution issue exporting mxfs, 1080p is coming out as 1088p

[William Jones]

If others can see this behaviour, I'll report it as a bug, unfortunately
due to security reasons I cannot get the log file off the server in the
office so cannot submit that with it.

When I use open the file in Nuke (our VFX compositing software) I can see
that the mxf metadata says 1080 yet the actual image canvas is 1088...
Strange!

Will

On Mon, 27 Feb 2023, 3:34 pm Michael Koch, <astroelectronic at t-online.de>
wrote:

> Am 27.02.2023 um 16:07 schrieb William Jones:
> > Hi All,
> >
> > I'm having a big problem with ffmpeg at the moment and wanted to pry the
> > minds of anyone who may know.
> >
> > Trying to export a image sequence as a .mxf file at 1920x1080, DnxHD 115.
> >
> > Unfortunately every time I try, the resulting file comes out as 1920x1088
> > which breaks our pipeline. Ive tried using scale and have tried the
> source
> > file being different formats (image sequences or .movs etc) and nothing
> has
> > helped so far, which is why the below  code doesnt have any scale
> modifiers
> > in it.
> >
> > the code i have been using is below:
> >
> > ffmpeg - start_number 1000 -i *-inputfile%4d.tiff* -c:v dnxhd -r 24
> > -b:v115M -pix_fmt yuv422p *outputfile.mxf*
> >
> > Any help at all would be much appreciated!
>
> Seems to be a bug. The issue is reproducible with these command lines
> (started from a Windows batch file):
>
> ffmpeg -f lavfi -i testsrc2=s=1920x1080 -frames 10 -y image%%3d.tiff
> ffmpeg -i image%%3d.tiff -c:v dnxhd -r 24 -b:v 115M -pix_fmt yuv422p -y
> out.mxf
>
> FFprobe reports 1920x1080, but ExitTool reports 1920x1088.
>
> Michael
>
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