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Changed thru to through and fixed several other typos

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Originally committed as revision 1358 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Philip Gladstone 2002-12-22 21:17:59 +00:00
parent bc15b8ef64
commit 6bf40f3961
1 changed files with 18 additions and 14 deletions
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@ -35,7 +35,7 @@ video on the fly with a high quality polyphase filter.
Gerd Knorr which I find very good. You must also set correctly the Gerd Knorr which I find very good. You must also set correctly the
audio recording levels with a standard mixer. audio recording levels with a standard mixer.
@section Video and Audio file format convertion @section Video and Audio file format conversion
* ffmpeg can use any supported file format and protocol as input: * ffmpeg can use any supported file format and protocol as input:
@ -83,7 +83,7 @@ Examples:
Convert the audio file a.wav and the raw yuv video file a.yuv Convert the audio file a.wav and the raw yuv video file a.yuv
to mpeg file a.mpg to mpeg file a.mpg
* You can also do audio and video convertions at the same time: * You can also do audio and video conversions at the same time:
@example @example
ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2 ffmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2
@ -108,13 +108,13 @@ Examples:
ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800 -g 300 -bf 2 -acodec mp3 -ab 128 snatch.avi ffmpeg -i snatch_1.vob -f avi -vcodec mpeg4 -b 800 -g 300 -bf 2 -acodec mp3 -ab 128 snatch.avi
@end example @end example
This is a typicall DVD ripper example, input from a VOB file, output This is a typical DVD ripper example, input from a VOB file, output
to an AVI file with MPEG-4 video and MP3 audio, note that in this to an AVI file with MPEG-4 video and MP3 audio, note that in this
command we use B frames so the MPEG-4 stream is DivX5 compatible, GOP command we use B frames so the MPEG-4 stream is DivX5 compatible, GOP
size is 300 that means an INTRA frame every 10 seconds for 29.97 fps size is 300 that means an INTRA frame every 10 seconds for 29.97 fps
input video. Also the audio stream is MP3 encoded so you need LAME input video. Also the audio stream is MP3 encoded so you need LAME
support which is enabled using @code{--enable-mp3lame} when support which is enabled using @code{--enable-mp3lame} when
configuring. The mapping is particullary usefull for DVD transcoding configuring. The mapping is particularly useful for DVD transcoding
to get the desired audio language. to get the desired audio language.
NOTE: to see the supported input formats, use @code{ffmpeg -formats}. NOTE: to see the supported input formats, use @code{ffmpeg -formats}.
@ -136,7 +136,7 @@ Examples:
files. files.
By default, ffmpeg tries to convert as losslessly as possible: it By default, ffmpeg tries to convert as losslessly as possible: it
uses the same audio and video parameter fors the outputs as the one uses the same audio and video parameter for the outputs as the one
specified for the inputs. specified for the inputs.
@section Main options @section Main options
@ -299,7 +299,7 @@ ffmpeg handles also many protocols specified with the URL syntax.
@item If your computer is not fast enough, you can speed up the @item If your computer is not fast enough, you can speed up the
compression at the expense of the compression ratio. You can use compression at the expense of the compression ratio. You can use
'-me zero' to speed up motion estimation, and '-intra' to disable '-me zero' to speed up motion estimation, and '-intra' to disable
completly motion estimation (you have only I frames, which means it completely motion estimation (you have only I frames, which means it
is about as good as JPEG compression). is about as good as JPEG compression).
@item To have very low bitrates in audio, reduce the sampling frequency @item To have very low bitrates in audio, reduce the sampling frequency
@ -321,7 +321,7 @@ You can use the @code{-formats} option to have an exhaustive list.
@section File Formats @section File Formats
FFmpeg supports the following file formats thru the @code{libavformat} FFmpeg supports the following file formats through the @code{libavformat}
library: library:
@multitable @columnfractions .4 .1 .1 @multitable @columnfractions .4 .1 .1
@ -399,11 +399,11 @@ solutions.
@item Supported Codec @tab Encoding @tab Decoding @tab Comments @item Supported Codec @tab Encoding @tab Decoding @tab Comments
@item MPEG audio layer 2 @tab IX @tab IX @item MPEG audio layer 2 @tab IX @tab IX
@item MPEG audio layer 1/3 @tab IX @tab IX @item MPEG audio layer 1/3 @tab IX @tab IX
@tab MP3 encoding is supported thru the external library LAME @tab MP3 encoding is supported through the external library LAME
@item AC3 @tab IX @tab X @item AC3 @tab IX @tab X
@tab liba52 is used internally for decoding. @tab liba52 is used internally for decoding.
@item Vorbis @tab X @tab X @item Vorbis @tab X @tab X
@tab supported thru the external library libvorbis. @tab supported through the external library libvorbis.
@item WMA V1/V2 @tab @tab X @item WMA V1/V2 @tab @tab X
@end multitable @end multitable
@ -418,7 +418,7 @@ performances on systems without hardware floating point support).
@section Linux @section Linux
ffmpeg should be compiled with at least GCC 2.95.3. GCC 3.2 is the ffmpeg should be compiled with at least GCC 2.95.3. GCC 3.2 is the
prefered compiler now for ffmpeg. All futur optimizations will depend on preferred compiler now for ffmpeg. All future optimizations will depend on
features only found in GCC 3.2. features only found in GCC 3.2.
@section BSD @section BSD
@ -490,10 +490,10 @@ When you submit your patch, try to send a unified diff (diff '-u'
option). I cannot read other diffs :-) option). I cannot read other diffs :-)
Run the regression tests before submitting a patch so that you can Run the regression tests before submitting a patch so that you can
verify that there is no big problems. verify that there are no big problems.
Except if your patch is really big and adds an important feature, by Except if your patch is really big and adds an important feature, by
submitting it to me, you accept implicitely to put it under my submitting it to me, you accept implicitly to put it under my
copyright. I prefer to do this to avoid potential problems if copyright. I prefer to do this to avoid potential problems if
licensing of ffmpeg changes. licensing of ffmpeg changes.
@ -504,15 +504,19 @@ transmission) to the ffmpeg-devel mailinglist, see
@section Regression tests @section Regression tests
Before submitting a patch (or commiting with CVS), you should at least Before submitting a patch (or committing with CVS), you should at least
test that you did not break anything. test that you did not break anything.
The regression test build a synthetic video stream and a synthetic The regression test build a synthetic video stream and a synthetic
audio stream. Then there are encoded then decoded with all codecs or audio stream. Then these are encoded then decoded with all codecs or
formats. The CRC (or MD5) of each generated file is recorded in a formats. The CRC (or MD5) of each generated file is recorded in a
result file. Then a 'diff' is launched with the reference results and result file. Then a 'diff' is launched with the reference results and
the result file. the result file.
The regression test then goes on to test the ffserver code with a
limited set of streams. It is important that this step runs correctly
as well.
Run 'make test' to test all the codecs. Run 'make test' to test all the codecs.
Run 'make libavtest' to test all the codecs. Run 'make libavtest' to test all the codecs.