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doc/ffmpeg: slightly rework introductory examples

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In particular, add a sentence to introduce the example, and add a
simpler starting example with no options.

Also use different format for input.avi and output.mp4, to convey
that the conversion also works on the container format.

Address issue:
http://trac.ffmpeg.org/ticket/8730
This commit is contained in:
Stefano Sabatini 2023-03-27 02:22:28 +02:00
parent ee25a434dc
commit 627d5a87bb
1 changed files with 15 additions and 7 deletions
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doc/ffmpeg.texi
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@ -49,24 +49,32 @@ Do not mix input and output files -- first specify all input files, then all
output files. Also do not mix options which belong to different files. All
options apply ONLY to the next input or output file and are reset between files.
Some simple examples follow.
@itemize
@item
To set the video bitrate of the output file to 64 kbit/s:
Convert an input media file to a different format, by re-encoding media streams:
@example
ffmpeg -i input.avi -b:v 64k -bufsize 64k output.avi
ffmpeg -i input.avi output.mp4
@end example
@item
To force the frame rate of the output file to 24 fps:
Set the video bitrate of the output file to 64 kbit/s:
@example
ffmpeg -i input.avi -r 24 output.avi
ffmpeg -i input.avi -b:v 64k -bufsize 64k output.mp4
@end example
@item
To force the frame rate of the input file (valid for raw formats only)
to 1 fps and the frame rate of the output file to 24 fps:
Force the frame rate of the output file to 24 fps:
@example
ffmpeg -r 1 -i input.m2v -r 24 output.avi
ffmpeg -i input.avi -r 24 output.mp4
@end example
@item
Force the frame rate of the input file (valid for raw formats only) to 1 fps and
the frame rate of the output file to 24 fps:
@example
ffmpeg -r 1 -i input.m2v -r 24 output.mp4
@end example
@end itemize