mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
doc: update to refer to avconv
This commit is contained in:
parent
0395d37abb
commit
708060d7d1
72
doc/faq.texi
72
doc/faq.texi
@ -24,10 +24,10 @@ No. Windows DLLs are not portable, bloated and often slow.
|
||||
Moreover Libav strives to support all codecs natively.
|
||||
A DLL loader is not conducive to that goal.
|
||||
|
||||
@section I cannot read this file although this format seems to be supported by ffmpeg.
|
||||
@section I cannot read this file although this format seems to be supported by avconv.
|
||||
|
||||
Even if ffmpeg can read the container format, it may not support all its
|
||||
codecs. Please consult the supported codec list in the ffmpeg
|
||||
Even if avconv can read the container format, it may not support all its
|
||||
codecs. Please consult the supported codec list in the avconv
|
||||
documentation.
|
||||
|
||||
@section Which codecs are supported by Windows?
|
||||
@ -81,12 +81,6 @@ problem and an NP-hard problem...
|
||||
|
||||
@chapter Usage
|
||||
|
||||
@section ffmpeg does not work; what is wrong?
|
||||
|
||||
Try a @code{make distclean} in the ffmpeg source directory before the build.
|
||||
If this does not help see our
|
||||
@uref{http://libav.org/bugreports.html, bug reporting guidelines}.
|
||||
|
||||
@section How do I encode single pictures into movies?
|
||||
|
||||
First, rename your pictures to follow a numerical sequence.
|
||||
@ -94,7 +88,7 @@ For example, img1.jpg, img2.jpg, img3.jpg,...
|
||||
Then you may run:
|
||||
|
||||
@example
|
||||
ffmpeg -f image2 -i img%d.jpg /tmp/a.mpg
|
||||
avconv -f image2 -i img%d.jpg /tmp/a.mpg
|
||||
@end example
|
||||
|
||||
Notice that @samp{%d} is replaced by the image number.
|
||||
@ -117,17 +111,17 @@ If you want to sequence them by oldest modified first, substitute
|
||||
Then run:
|
||||
|
||||
@example
|
||||
ffmpeg -f image2 -i /tmp/img%03d.jpg /tmp/a.mpg
|
||||
avconv -f image2 -i /tmp/img%03d.jpg /tmp/a.mpg
|
||||
@end example
|
||||
|
||||
The same logic is used for any image format that ffmpeg reads.
|
||||
The same logic is used for any image format that avconv reads.
|
||||
|
||||
@section How do I encode movie to single pictures?
|
||||
|
||||
Use:
|
||||
|
||||
@example
|
||||
ffmpeg -i movie.mpg movie%d.jpg
|
||||
avconv -i movie.mpg movie%d.jpg
|
||||
@end example
|
||||
|
||||
The @file{movie.mpg} used as input will be converted to
|
||||
@ -135,15 +129,15 @@ The @file{movie.mpg} used as input will be converted to
|
||||
|
||||
Instead of relying on file format self-recognition, you may also use
|
||||
@table @option
|
||||
@item -vcodec ppm
|
||||
@item -vcodec png
|
||||
@item -vcodec mjpeg
|
||||
@item -c:v ppm
|
||||
@item -c:v png
|
||||
@item -c:v mjpeg
|
||||
@end table
|
||||
to force the encoding.
|
||||
|
||||
Applying that to the previous example:
|
||||
@example
|
||||
ffmpeg -i movie.mpg -f image2 -vcodec mjpeg menu%d.jpg
|
||||
avconv -i movie.mpg -f image2 -c:v mjpeg menu%d.jpg
|
||||
@end example
|
||||
|
||||
Beware that there is no "jpeg" codec. Use "mjpeg" instead.
|
||||
@ -165,13 +159,13 @@ Try '-f image2 test%d.jpg'.
|
||||
@section Why can I not change the framerate?
|
||||
|
||||
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 -c:v command line option.
|
||||
|
||||
@section How do I encode Xvid or DivX video with ffmpeg?
|
||||
@section How do I encode Xvid or DivX video with avconv?
|
||||
|
||||
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
|
||||
same standard). Thus, use '-vcodec mpeg4' to encode in these formats. The
|
||||
same standard). Thus, use '-c:v mpeg4' to encode in these formats. The
|
||||
default fourcc stored in an MPEG-4-coded file will be 'FMP4'. If you want
|
||||
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
|
||||
@ -188,7 +182,7 @@ things to try: '-bf 2', '-flags qprd', '-flags mv0', '-flags skiprd'.
|
||||
but beware the '-g 100' might cause problems with some decoders.
|
||||
Things to try: '-bf 2', '-flags qprd', '-flags mv0', '-flags skiprd.
|
||||
|
||||
@section Interlaced video looks very bad when encoded with ffmpeg, what is wrong?
|
||||
@section Interlaced video looks very bad when encoded with avconv, what is wrong?
|
||||
|
||||
You should use '-flags +ilme+ildct' and maybe '-flags +alt' for interlaced
|
||||
material, and try '-top 0/1' if the result looks really messed-up.
|
||||
@ -203,9 +197,9 @@ Just create an "input.avs" text file with this single line ...
|
||||
@example
|
||||
DirectShowSource("C:\path to your file\yourfile.asf")
|
||||
@end example
|
||||
... and then feed that text file to ffmpeg:
|
||||
... and then feed that text file to avconv:
|
||||
@example
|
||||
ffmpeg -i input.avs
|
||||
avconv -i input.avs
|
||||
@end example
|
||||
|
||||
For ANY other help on Avisynth, please visit the
|
||||
@ -222,13 +216,13 @@ equally humble @code{copy} under Windows), and finally transcoding back to your
|
||||
format of choice.
|
||||
|
||||
@example
|
||||
ffmpeg -i input1.avi -sameq intermediate1.mpg
|
||||
ffmpeg -i input2.avi -sameq intermediate2.mpg
|
||||
avconv -i input1.avi -same_quant intermediate1.mpg
|
||||
avconv -i input2.avi -same_quant intermediate2.mpg
|
||||
cat intermediate1.mpg intermediate2.mpg > intermediate_all.mpg
|
||||
ffmpeg -i intermediate_all.mpg -sameq output.avi
|
||||
avconv -i intermediate_all.mpg -same_quant output.avi
|
||||
@end example
|
||||
|
||||
Notice that you should either use @code{-sameq} or set a reasonably high
|
||||
Notice that you should either use @code{-same_quant} or set a reasonably high
|
||||
bitrate for your intermediate and output files, if you want to preserve
|
||||
video quality.
|
||||
|
||||
@ -238,10 +232,10 @@ of named pipes, should your platform support it:
|
||||
@example
|
||||
mkfifo intermediate1.mpg
|
||||
mkfifo intermediate2.mpg
|
||||
ffmpeg -i input1.avi -sameq -y intermediate1.mpg < /dev/null &
|
||||
ffmpeg -i input2.avi -sameq -y intermediate2.mpg < /dev/null &
|
||||
avconv -i input1.avi -same_quant -y intermediate1.mpg < /dev/null &
|
||||
avconv -i input2.avi -same_quant -y intermediate2.mpg < /dev/null &
|
||||
cat intermediate1.mpg intermediate2.mpg |\
|
||||
ffmpeg -f mpeg -i - -sameq -vcodec mpeg4 -acodec libmp3lame output.avi
|
||||
avconv -f mpeg -i - -same_quant -c:v mpeg4 -acodec libmp3lame output.avi
|
||||
@end example
|
||||
|
||||
Similarly, the yuv4mpegpipe format, and the raw video, raw audio codecs also
|
||||
@ -260,15 +254,15 @@ mkfifo temp2.a
|
||||
mkfifo temp2.v
|
||||
mkfifo all.a
|
||||
mkfifo all.v
|
||||
ffmpeg -i input1.flv -vn -f u16le -acodec pcm_s16le -ac 2 -ar 44100 - > temp1.a < /dev/null &
|
||||
ffmpeg -i input2.flv -vn -f u16le -acodec pcm_s16le -ac 2 -ar 44100 - > temp2.a < /dev/null &
|
||||
ffmpeg -i input1.flv -an -f yuv4mpegpipe - > temp1.v < /dev/null &
|
||||
@{ ffmpeg -i input2.flv -an -f yuv4mpegpipe - < /dev/null | tail -n +2 > temp2.v ; @} &
|
||||
avconv -i input1.flv -vn -f u16le -acodec pcm_s16le -ac 2 -ar 44100 - > temp1.a < /dev/null &
|
||||
avconv -i input2.flv -vn -f u16le -acodec pcm_s16le -ac 2 -ar 44100 - > temp2.a < /dev/null &
|
||||
avconv -i input1.flv -an -f yuv4mpegpipe - > temp1.v < /dev/null &
|
||||
@{ avconv -i input2.flv -an -f yuv4mpegpipe - < /dev/null | tail -n +2 > temp2.v ; @} &
|
||||
cat temp1.a temp2.a > all.a &
|
||||
cat temp1.v temp2.v > all.v &
|
||||
ffmpeg -f u16le -acodec pcm_s16le -ac 2 -ar 44100 -i all.a \
|
||||
avconv -f u16le -acodec pcm_s16le -ac 2 -ar 44100 -i all.a \
|
||||
-f yuv4mpegpipe -i all.v \
|
||||
-sameq -y output.flv
|
||||
-same_quant -y output.flv
|
||||
rm temp[12].[av] all.[av]
|
||||
@end example
|
||||
|
||||
@ -304,7 +298,7 @@ the silver bullet that solves this problem, feel free to shoot it at us.
|
||||
|
||||
We strongly recommend you to move over from MSVC++ to MinGW tools.
|
||||
|
||||
@section Can I use Libav or libavcodec under Windows?
|
||||
@section Can I use Libav under Windows?
|
||||
|
||||
Yes, but the Cygwin or MinGW tools @emph{must} be used to compile Libav.
|
||||
Read the @emph{Windows} section in the Libav documentation to find more
|
||||
@ -314,7 +308,7 @@ information.
|
||||
|
||||
No. These tools are too bloated and they complicate the build.
|
||||
|
||||
@section Why not rewrite ffmpeg in object-oriented C++?
|
||||
@section Why not rewrite Libav in object-oriented C++?
|
||||
|
||||
Libav 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
|
||||
@ -327,7 +321,7 @@ Yes, as long as the code is optional and can easily and cleanly be placed
|
||||
under #if CONFIG_GPL without breaking anything. So for example a new codec
|
||||
or filter would be OK under GPL while a bug fix to LGPL code would not.
|
||||
|
||||
@section I'm using libavcodec from within my C++ application but the linker complains about missing symbols which seem to be available.
|
||||
@section I'm using Libav from within my C++ application but the linker complains about missing symbols which seem to be available.
|
||||
|
||||
Libav is a pure C project, so to use the libraries within your C++ application
|
||||
you need to explicitly state that you are using a C library. You can do this by
|
||||
|
Loading…
Reference in New Issue
Block a user