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Selecting both scale and rotate options results in:

  Multiple -filter, -af or -vf options specified for stream 0, only the last option '-filter:v transpose=1' will be used.
-vn, -an, -ss, and -to are specified as output rather than input options, which are much more efficient.


just from this comment, using -filter_complex seems like a much better option. in fact, on past experience, I couldn't see myself building an FFMPEG command builder and not use filter_complex.




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