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In the sound filter atempo
the numerator output_fps
sets the output speed and the denominator input_fps
sets the input speed; both values are given in frames per second.
The different filters in a complex filter can be divided either by comma or semicolon. The quotation marks allow to insert a space between the filters for readability.
- -map "[v]"maps the video stream and:
+ -map "[v]"maps the video stream and
-map "[a]"maps the audio stream together into:
output_filepath, name and extension of the output file