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doc/ffmpeg: improve -r documentation 

Explain different behavior for encoding and streamcopy.
This commit is contained in:
Anton Khirnov 2022-12-10 09:25:50 +01:00
parent 7655249f72
commit e884360e91
1 changed files with 12 additions and 1 deletions
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doc/ffmpeg.texi
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@ -877,9 +877,20 @@ This is not the same as the @option{-framerate} option used for some input forma
like image2 or v4l2 (it used to be the same in older versions of FFmpeg).
If in doubt use @option{-framerate} instead of the input option @option{-r}.
As an output option, duplicate or drop input frames to achieve constant output
As an output option:
@table @option
@item video encoding
Duplicate or drop frames right before encoding them to achieve constant output
frame rate @var{fps}.
@item video streamcopy
Indicate to the muxer that @var{fps} is the stream frame rate. No data is
dropped or duplicated in this case. This may produce invalid files if @var{fps}
does not match the actual stream frame rate as determined by packet timestamps.
See also the @code{setts} bitstream filter.
@end table
@item -fpsmax[:@var{stream_specifier}] @var{fps} (@emph{output,per-stream})
Set maximum frame rate (Hz value, fraction or abbreviation).