Skip to content
GitLab
Menu
Projects
Groups
Snippets
Loading...
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in
Toggle navigation
Menu
Open sidebar
BC
public
external
ffmpeg
Commits
6bf40f39
Commit
6bf40f39
authored
Dec 22, 2002
by
Philip Gladstone
Browse files
Changed thru to through and fixed several other typos
Originally committed as revision 1358 to
svn://svn.ffmpeg.org/ffmpeg/trunk
parent
bc15b8ef
Changes
1
Hide whitespace changes
Inline
Side-by-side
doc/ffmpeg-doc.texi
View file @
6bf40f39
...
...
@@ -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
audio recording levels with a standard mixer.
@section Video and Audio file format conver
t
ion
@section Video and Audio file format conver
s
ion
* 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
to mpeg file a.mpg
* You can also do audio and video conver
t
ions at the same time:
* You can also do audio and video conver
s
ions at the same time:
@example
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
@end example
This is a typical
l
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
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
input video. Also the audio stream is MP3 encoded so you need LAME
support which is enabled using @code
{
--enable-mp3lame
}
when
configuring. The mapping is particul
l
ary useful
l
for DVD transcoding
configuring. The mapping is particular
l
y useful for DVD transcoding
to get the desired audio language.
NOTE: to see the supported input formats, use @code
{
ffmpeg -formats
}
.
...
...
@@ -136,7 +136,7 @@ Examples:
files.
By default, ffmpeg tries to convert as losslessly as possible: it
uses the same audio and video parameter for
s
the outputs as the one
uses the same audio and video parameter for the outputs as the one
specified for the inputs.
@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
compression at the expense of the compression ratio. You can use
'-me zero' to speed up motion estimation, and '-intra' to disable
completly motion estimation (you have only I frames, which means it
complet
e
ly motion estimation (you have only I frames, which means it
is about as good as JPEG compression).
@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
FFmpeg supports the following file formats thr
u
the @code
{
libavformat
}
FFmpeg supports the following file formats thr
ough
the @code
{
libavformat
}
library:
@multitable @columnfractions .4 .1 .1
...
...
@@ -399,11 +399,11 @@ solutions.
@item Supported Codec @tab Encoding @tab Decoding @tab Comments
@item MPEG audio layer 2 @tab IX @tab IX
@item MPEG audio layer 1/3 @tab IX @tab IX
@tab MP3 encoding is supported thr
u
the external library LAME
@tab MP3 encoding is supported thr
ough
the external library LAME
@item AC3 @tab IX @tab X
@tab liba52 is used internally for decoding.
@item Vorbis @tab X @tab X
@tab supported thr
u
the external library libvorbis.
@tab supported thr
ough
the external library libvorbis.
@item WMA V1/V2 @tab @tab X
@end multitable
...
...
@@ -418,7 +418,7 @@ performances on systems without hardware floating point support).
@section Linux
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
prefer
r
ed compiler now for ffmpeg. All futur
e
optimizations will depend on
features only found in GCC 3.2.
@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 :-)
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
submitting it to me, you accept implicit
e
ly 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
licensing of ffmpeg changes.
...
...
@@ -504,15 +504,19 @@ transmission) to the ffmpeg-devel mailinglist, see
@section Regression tests
Before submitting a patch (or commiting with CVS), you should at least
Before submitting a patch (or commit
t
ing with CVS), you should at least
test that you did not break anything.
The regression test build a synthetic video stream and a synthetic
audio stream. Then the
r
e are encoded then decoded with all codecs or
audio stream. Then the
s
e are encoded then decoded with all codecs or
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
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 libavtest' to test all the codecs.
...
...
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
.
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment