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doc/ffmpeg: improve -r documentation

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Explain different behavior for encoding and streamcopy.
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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). 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}. 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}. 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}) @item -fpsmax[:@var{stream_specifier}] @var{fps} (@emph{output,per-stream})
Set maximum frame rate (Hz value, fraction or abbreviation). Set maximum frame rate (Hz value, fraction or abbreviation).