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Some notes about the order of options on the command line.

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patch by Víctor Paesa, wzrlpy arsystel com

Originally committed as revision 7135 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Víctor Paesa 2006-11-20 18:44:33 +00:00 committed by Diego Biurrun
parent 9f83e1427a
commit 699e77b198
1 changed files with 25 additions and 3 deletions
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doc/ffmpeg-doc.texi
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@ -139,9 +139,31 @@ ffmpeg [[infile options][@option{-i} @var{infile}]]... @{[outfile options] @var{
If no input file is given, audio/video grabbing is done.
As a general rule, options are applied to the next specified
file. For example, if you give the @option{-b 64k} option, it sets the video
bitrate of the next file. The format option may be needed for raw input
files.
file. Therefore, order is important, and you can have the same
option on the comman line multiple times. Each occurence is
then applied to the next input or output file.
* To set the video bitrate of the output file to 64Kbit/s:
@example
ffmpeg -i input.avi -b 64k output.avi
@end example
* To force the frame rate of the input and output file to 24 fps:
@example
ffmpeg -r 24 -i input.avi output.avi
@end example
* To force the frame rate of the output file to 24 fps:
@example
ffmpeg -i input.avi -r 24 output.avi
@end example
* To force the frame rate of input file to 1 fps and the output file to 24 fps:
@example
ffmpeg -r 1 -i input.avi -r 24 output.avi
@end example
The format option may be needed for raw input files.
By default, FFmpeg tries to convert as losslessly as possible: It
uses the same audio and video parameters for the outputs as the one