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