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I created an ffmpeg script to rotate -90 some videos that I record on my Sony A7iii, with the camera vertically, this makes these videos display correctly.

the script is this:

ffmpeg -i input.mp4 -c:v copy -metadata:s:v:0 rotate=-90 output.mp4

The issue is that for some reason all the output files are having variations of 2 frames, which causes me problems when I use these files as Proxy in Premiere Pro.

For example, if the original file has a Media Duration (in Premiere Pro) of 00:00:32:12, the output file for some reason will have a Media Duration of 00:00:32:10.

Another very curious point is that the file generated by ffmpeg always has a size variation, whereas the file generated by ExifTool has no variation at all...

ExifTool

Using this ExifTool command I can do the same conversion and I don't have this frame shifting problem:

exiftool -m -P -overwrite_original -api LargeFileSupport=1 -rotation=90 movie.mp4

But I would still like to be able to get the proper result using ffmpeg, because doing the work through ffmpeg would make my workflow easier.

Any idea why the problem is occurring?

Edit

I still haven't managed to get it to work through FFMPEG, does anyone have any ideas?

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