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Originally committed as revision 4361 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Diego Biurrun 2005-06-09 17:54:48 +00:00
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@ -27,9 +27,9 @@ documentation.
Currently, the grabbing stuff does not handle synchronisation Currently, the grabbing stuff does not handle synchronisation
correctly. You are free to correct it. A fix is planned. correctly. You are free to correct it. A fix is planned.
@section How do I encode jpegs to another format ? @section How do I encode JPEGs to another format ?
If the jpegs are named img1.jpg, img2.jpg, img3.jpg,..., use: If the JPEGs are named img1.jpg, img2.jpg, img3.jpg,..., use:
@example @example
ffmpeg -i img%d.jpg /tmp/a.mpg ffmpeg -i img%d.jpg /tmp/a.mpg
@ -65,12 +65,12 @@ with @code{./configure --enable-a52}. Take care: by
enabling AC3, you automatically change the license of libavcodec from enabling AC3, you automatically change the license of libavcodec from
LGPL to GPL. LGPL to GPL.
@section Which codecs are supported by windows ? @section Which codecs are supported by Windows ?
Windows does not support standard formats like mpeg very well, unless you Windows does not support standard formats like MPEG very well, unless you
install some additional codecs install some additional codecs
The following list of video codecs should work on most windows systems The following list of video codecs should work on most Windows systems
@table @option @table @option
@item msmpeg4v2 @item msmpeg4v2
.avi/.asf .avi/.asf
@ -81,22 +81,22 @@ The following list of video codecs should work on most windows systems
@item wmv2 @item wmv2
.asf only .asf only
@item mpeg4 @item mpeg4
only if you have some mpeg4 codec installed like ffdshow or xvid only if you have some MPEG-4 codec installed like ffdshow or xvid
@item mpeg1 @item mpeg1
.mpg only .mpg only
@end table @end table
Note, asf files often have .wmv or .wma extensions in windows. It should also Note, ASF files often have .wmv or .wma extensions in Windows. It should also
be mentioned that Microsoft claims a patent on the ASF format, and may sue be mentioned that Microsoft claims a patent on the ASF format, and may sue
or threaten users who create ASF files with non-Microsoft software. It is or threaten users who create ASF files with non-Microsoft software. It is
strongly advised to avoid ASF where possible. strongly advised to avoid ASF where possible.
The following list of audio codecs should work on most windows systems The following list of audio codecs should work on most Windows systems
@table @option @table @option
@item adpcm_ima_wav @item adpcm_ima_wav
@item adpcm_ms @item adpcm_ms
@item pcm @item pcm
@item mp3 @item mp3
if some mp3 codec like lame is installed if some mp3 codec like LAME is installed
@end table @end table
@section Why does the chrominance data seem to be sampled at a different time than the luminance data on bt8x8 captures on Linux? @section Why does the chrominance data seem to be sampled at a different time than the luminance data on bt8x8 captures on Linux?
@ -105,7 +105,7 @@ This is a well-known bug in the bt8x8 driver. For 2.4.26 there is a patch at
(@url{http://www.mplayerhq.hu/~michael/bttv-420-2.4.26.patch}). This may also (@url{http://www.mplayerhq.hu/~michael/bttv-420-2.4.26.patch}). This may also
apply cleanly to other 2.4-series kernels. apply cleanly to other 2.4-series kernels.
@section How do I avoid the ugly aliassing artifacts in bt8x8 captures on linux? @section How do I avoid the ugly aliasing artifacts in bt8x8 captures on Linux?
Pass 'combfilter=1 lumafilter=1' to the bttv driver. Note though that 'combfilter=1' Pass 'combfilter=1 lumafilter=1' to the bttv driver. Note though that 'combfilter=1'
will cause somewhat too strong filtering. A fix is to apply (@url{http://www.mplayerhq.hu/~michael/bttv-comb-2.4.26.patch}) will cause somewhat too strong filtering. A fix is to apply (@url{http://www.mplayerhq.hu/~michael/bttv-comb-2.4.26.patch})
@ -114,17 +114,17 @@ and pass 'combfilter=2'.
@section I have a problem with an old version of ffmpeg; where should i report it? @section I have a problem with an old version of ffmpeg; where should i report it?
Nowhere. Upgrade to the latest release or if there is no recent release upgrade Nowhere. Upgrade to the latest release or if there is no recent release upgrade
to cvs. You could also try to report it. Maybe you will get lucky and to CVS. You could also try to report it. Maybe you will get lucky and
become the first person in history to get a different answer from "upgrade become the first person in history to get an answer different from "upgrade
to cvs". to CVS".
@section -f jpeg doesnt work. @section -f jpeg doesnt work.
try '-f image -img jpeg test%d.jpg' Try '-f image -img jpeg test%d.jpg'.
@section Why can I not change the framerate? @section Why can I not change the framerate?
Some codecs, like MPEG 1/2 only allow a small number of fixed framerates. Some codecs, like MPEG-1/2 only allow a small number of fixed framerates.
Choose a different codec with the -vcodec command line option. Choose a different codec with the -vcodec command line option.
@section ffmpeg does not work; What is wrong? @section ffmpeg does not work; What is wrong?
@ -132,12 +132,12 @@ Choose a different codec with the -vcodec command line option.
Try a 'make distclean' in the ffmpeg source directory. If this does not help see Try a 'make distclean' in the ffmpeg source directory. If this does not help see
(@url{ffmpeg-bugreport.html}). (@url{ffmpeg-bugreport.html}).
@section How do I encode XviD or DIVX video with ffmpeg? @section How do I encode XviD or DivX video with ffmpeg?
Both XviD and DIVX (version 4+) are implementations of the ISO MPEG-4 Both XviD and DivX (version 4+) are implementations of the ISO MPEG-4
standard (note that there are many other coding formats that use this standard (note that there are many other coding formats that use this
same standard). Thus, use '-vcodec mpeg4' to encode these formats. The same standard). Thus, use '-vcodec mpeg4' to encode these formats. The
default fourcc stored in a MPEG-4-coded file will be 'DIVX'. If you want default fourcc stored in an MPEG-4-coded file will be 'DIVX'. If you want
a different fourcc, use the '-vtag' option. E.g., '-vtag xvid' will a different fourcc, use the '-vtag' option. E.g., '-vtag xvid' will
force the fourcc 'xvid' to be stored as the video fourcc rather than the force the fourcc 'xvid' to be stored as the video fourcc rather than the
default. default.
@ -171,7 +171,7 @@ terms of portability.
@section Why not rewrite ffmpeg in object-oriented C++ ? @section Why not rewrite ffmpeg in object-oriented C++ ?
ffmpeg is already organized in a highly modular manner does not need to ffmpeg is already organized in a highly modular manner and does not need to
be rewritten in a formal object language. Further, many of the developers be rewritten in a formal object language. Further, many of the developers
favor straight C; it works for them. For more arguments on this matter, favor straight C; it works for them. For more arguments on this matter,
read "Programming Religion" at (@url{http://lkml.org/faq/lkmlfaq-15.html}). read "Programming Religion" at (@url{http://lkml.org/faq/lkmlfaq-15.html}).