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doc: update to refer to avconv

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Luca Barbato
2011-12-10 01:58:04 +01:00
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doc/faq.texi
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@ -24,10 +24,10 @@ No. Windows DLLs are not portable, bloated and often slow.
Moreover Libav strives to support all codecs natively. Moreover Libav strives to support all codecs natively.
A DLL loader is not conducive to that goal. 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 Even if avconv can read the container format, it may not support all its
codecs. Please consult the supported codec list in the ffmpeg codecs. Please consult the supported codec list in the avconv
documentation. documentation.
@section Which codecs are supported by Windows? @section Which codecs are supported by Windows?
@ -81,12 +81,6 @@ problem and an NP-hard problem...
@chapter Usage @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? @section How do I encode single pictures into movies?
First, rename your pictures to follow a numerical sequence. 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: Then you may run:
@example @example
ffmpeg -f image2 -i img%d.jpg /tmp/a.mpg avconv -f image2 -i img%d.jpg /tmp/a.mpg
@end example @end example
Notice that @samp{%d} is replaced by the image number. 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: Then run:
@example @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 @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? @section How do I encode movie to single pictures?
Use: Use:
@example @example
ffmpeg -i movie.mpg movie%d.jpg avconv -i movie.mpg movie%d.jpg
@end example @end example
The @file{movie.mpg} used as input will be converted to 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 Instead of relying on file format self-recognition, you may also use
@table @option @table @option
@item -vcodec ppm @item -c:v ppm
@item -vcodec png @item -c:v png
@item -vcodec mjpeg @item -c:v mjpeg
@end table @end table
to force the encoding. to force the encoding.
Applying that to the previous example: Applying that to the previous example:
@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 @end example
Beware that there is no "jpeg" codec. Use "mjpeg" instead. 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? @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 -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 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 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 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 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
@ -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. but beware the '-g 100' might cause problems with some decoders.
Things to try: '-bf 2', '-flags qprd', '-flags mv0', '-flags skiprd. 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 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. 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 @example
DirectShowSource("C:\path to your file\yourfile.asf") DirectShowSource("C:\path to your file\yourfile.asf")
@end example @end example
... and then feed that text file to ffmpeg: ... and then feed that text file to avconv:
@example @example
ffmpeg -i input.avs avconv -i input.avs
@end example @end example
For ANY other help on Avisynth, please visit the 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. format of choice.
@example @example
ffmpeg -i input1.avi -sameq intermediate1.mpg avconv -i input1.avi -same_quant intermediate1.mpg
ffmpeg -i input2.avi -sameq intermediate2.mpg avconv -i input2.avi -same_quant intermediate2.mpg
cat intermediate1.mpg intermediate2.mpg > intermediate_all.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 @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 bitrate for your intermediate and output files, if you want to preserve
video quality. video quality.
@ -238,10 +232,10 @@ of named pipes, should your platform support it:
@example @example
mkfifo intermediate1.mpg mkfifo intermediate1.mpg
mkfifo intermediate2.mpg mkfifo intermediate2.mpg
ffmpeg -i input1.avi -sameq -y intermediate1.mpg < /dev/null & avconv -i input1.avi -same_quant -y intermediate1.mpg < /dev/null &
ffmpeg -i input2.avi -sameq -y intermediate2.mpg < /dev/null & avconv -i input2.avi -same_quant -y intermediate2.mpg < /dev/null &
cat intermediate1.mpg intermediate2.mpg |\ 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 @end example
Similarly, the yuv4mpegpipe format, and the raw video, raw audio codecs also Similarly, the yuv4mpegpipe format, and the raw video, raw audio codecs also
@ -260,15 +254,15 @@ mkfifo temp2.a
mkfifo temp2.v mkfifo temp2.v
mkfifo all.a mkfifo all.a
mkfifo all.v mkfifo all.v
ffmpeg -i input1.flv -vn -f u16le -acodec pcm_s16le -ac 2 -ar 44100 - > temp1.a < /dev/null & avconv -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 & avconv -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 & avconv -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 input2.flv -an -f yuv4mpegpipe - < /dev/null | tail -n +2 > temp2.v ; @} &
cat temp1.a temp2.a > all.a & cat temp1.a temp2.a > all.a &
cat temp1.v temp2.v > all.v & 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 \ -f yuv4mpegpipe -i all.v \
-sameq -y output.flv -same_quant -y output.flv
rm temp[12].[av] all.[av] rm temp[12].[av] all.[av]
@end example @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. 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. 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 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. 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 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 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 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. 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 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 you need to explicitly state that you are using a C library. You can do this by