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webp: ensure that each transform is only used once

According to the WebP Lossless Bitstream Specification
"each transform is allowed to be used only once".

If a transform is more than once this can lead to memory

Signed-off-by: Michael Niedermayer <>
latest commit c089e720c1
Andreas Cadhalpun authored michaelni committed
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compat compat/avisynth/windowsPorts/windows2linux: Add () to protect macro a…
doc doc/protocols/tcp: fix units of listen_timeout option value, from mic…
libavcodec webp: ensure that each transform is only used once
libavdevice lavd/avfoundation: Add support for 24 and 32bit integer input.
libavfilter Merge commit '88b160a457e491cb9e014630ef5387ad3500258e'
libavformat hls: detect SAMPLE-AES encryption
libavresample Merge commit '12655c48049f9a52e5504bde90fe738862b0ff08'
libavutil avutil/opt: Do not print inf in selftest
libpostproc postproc: mark alloc/free context functions as av_cold
libswresample swresample: Add prefix to soxr_resampler
libswscale swscale: Add prefix to updateMMXDitherTables()
presets presets: remove moldering iPod presets
tests avutil/opt: Do not print inf in selftest
tools tools/graph2dot: Check for av_malloc() failure
.gitattributes Treat all '*.pnm' files as non-text file
.gitignore Merge commit '11e05533170485b593974cf90916425a0188e7bd'
COPYING.GPLv3 Add configure option to upgrade (L)GPL to version 3.
COPYING.LGPLv2.1 cosmetics: Delete empty lines at end of file.
COPYING.LGPLv3 Add configure option to upgrade (L)GPL to version 3.
CREDITS CREDITS: redirect to Git log, remove current outdated content
Changelog Merge commit '9c09fbd8053292267cdc4b542913ceced43ea3a9' INSTALL: add markdown syntax Formatting updates
MAINTAINERS MAINTAINERS: add myself as rtpdec_mpa_robust maintainer
Makefile Makefile: add dependencies which require ffversion.h README: add ffserver
arch.mak Merge commit '8675bcb0addb1c7fb0b04682d1f3f95d5b8dae14'
cmdutils.c cmdutils: fix success path
cmdutils.h opts: add list device sources/sinks options
cmdutils_common_opts.h opts: add list device sources/sinks options
cmdutils_opencl.c cmdutils_opencl: Use av_malloc_array()
common.mak Makefile: improve DBG option for asm
configure Allow AVFoundation compilation on OS X 10.7.
ffmpeg.c ffmpeg: comment mpeg4 hack
ffmpeg.h ffmpeg: allow to set the thread message queue size.
ffmpeg_dxva2.c ffmpeg_dxva2: add hevc support
ffmpeg_filter.c ffmpeg: fix accurate seeking with -copyts
ffmpeg_opt.c ffmpeg: allow to set the thread message queue size.
ffmpeg_vda.c Merge commit '1839fafa951308237c4672ffd9a94f927b26eac7'
ffmpeg_vdpau.c Merge commit '1f9237f2ac46dfbed1bfa1f4f0f1314c2a1d62ec'
ffplay.c ffplay: Switch to show waves mode if allocation/init of RDFT fails
ffprobe.c ffprobe: Change string_validation to int, its accessed via AVOption a…
ffserver.c ffserver: fix wrong indentation
ffserver_config.c ffserver_config: reflow add_codec()
ffserver_config.h ffserver: dont leak child arguments
library.mak x86/doc/Makefile: DBG=1 to preprocess external asm Print versions based on the last git tag for release bran…


FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.


  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.


  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis tool to inspect multimedia content.
  • ffserver is a multimedia streaming server for live broadcasts.
  • Additional small tools such as aviocat, ismindex and qt-faststart.


The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.


Coding examples are available in the doc/examples directory.


FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

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