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doc/ffmpeg: slightly rework introductory examples
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
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@ -49,24 +49,32 @@ Do not mix input and output files -- first specify all input files, then all
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output files. Also do not mix options which belong to different files. All
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options apply ONLY to the next input or output file and are reset between files.
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Some simple examples follow.
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@itemize
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@item
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To set the video bitrate of the output file to 64 kbit/s:
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Convert an input media file to a different format, by re-encoding media streams:
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@example
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ffmpeg -i input.avi -b:v 64k -bufsize 64k output.avi
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ffmpeg -i input.avi output.mp4
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@end example
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@item
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To force the frame rate of the output file to 24 fps:
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Set the video bitrate of the output file to 64 kbit/s:
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@example
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ffmpeg -i input.avi -r 24 output.avi
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ffmpeg -i input.avi -b:v 64k -bufsize 64k output.mp4
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@end example
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@item
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To force the frame rate of the input file (valid for raw formats only)
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to 1 fps and the frame rate of the output file to 24 fps:
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Force the frame rate of the output file to 24 fps:
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@example
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ffmpeg -r 1 -i input.m2v -r 24 output.avi
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ffmpeg -i input.avi -r 24 output.mp4
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@end example
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@item
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Force the frame rate of the input file (valid for raw formats only) to 1 fps and
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the frame rate of the output file to 24 fps:
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@example
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ffmpeg -r 1 -i input.m2v -r 24 output.mp4
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@end example
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@end itemize
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