libtheora 1.2.0 (2025 March 29)
 * Bumped minor SONAME versions as oc_comment_unpack() implementation
   changed.
 * Added example wrapper script encoder_example_ffmpeg (#1601 #2336).
 * Improve comment handling on platforms where malloc(0) return NULL
   (#2304).
 * Added pragma in example code to quiet clang op precedenca warnings.
 * Adjusted encoder_example help text.
 * Adjusted README, CHANGES, pkg-config and spec files to better reflect
   current release (#2331 #2328).
 * Corrected english typos in source and build system.
 * Switched http links to https in doc and comments where relevant.
   Did not touch RFC drafts.

libtheora 1.2.0beta1 (2025 March 15)
 * Bumped minor SONAME versions as <codec.h> methods changed constness
   of arguments.
 * Updated libogg dependency to version 1.3.4 for ogg_uint64_t.
 * Updated doxygen setup.
 * Updated autotools setup and support scripts (#1467 #1800 #1987 #2318
   #2320).
 * Added support for RISC OS.
 * Fixed mingw build (#2141).
 * Improved ARM support.
 * Converted SCons setup to work with Python 3.
 * Introduced new configure options --enable-mem-constraint and
   --enable-gcc-sanitizers.
 * Fixed all known compiler warnings and errors from gcc and clang.
 * Improved examples for stability and correctness.
 * Various speed, bug fixes and code quality improvements.
   - Fixed build problem with Visual Studio (#2317).
   - Avoids undefined bit shift of signed numbers (#2321, #2322).
   - Avoids example encoder crash on bogus audio input (#2305).
   - Fixed musl linking issue with asm enabled (#2287).
   - Fixed some broken clamping in rate control (#2229).
   - Added NULL check _tc and _setup even for data packets (#2279).
   - Fixed mismatched oc_mb_fill_cmapping11 signature (#2068).
   - Updated the documentation for theora_encode_comment() (#726).
   - Adjusted build to only link libcompat with dump_video (#1587).
   - Corrected an operator precedence error in the visualization
     code (#1751).
   - Fixed two spelling errors in the comments (#1804).
   - Avoid negative bit shift operation in huffdec.c (CVE-2024-56431).
 * Improved library documentation and specification text.
 * Adjusted library dependencies so libtheoraenc do not depend on
   libtheoradec.
 * Handle fallout from CVE-2017-14633 in libvorbis, check return value
   in encoder_example and transcoder_example.

libtheora 1.2.0alpha1 (2010 September 23)

 * New 'ptalarbvorm' encoder with better rate/distortion optimization
 * New th_encode_ctl option for copying configuration from an existing
   setup header, useful for splicing streams.
 * Returns TH_DUPFRAME in more cases.
 * Add ARM optimizations
 * Add TI C64x+ DSP optimizations
 * Other performance improvements
 * Rename speedlevel 2 to 3 and provide a new speedlevel 2
 * Various minor bug fixes

libtheora 1.1.2 (unreleased snapshot)

 * Fix Huffman table decoding with OC_HUFF_SLUSH is set to 0
 * Fix a frame size bug in player_example
 * Add support for passing a buffer the size of the picture
   region, rather than a full padded frame to th_encode_ycbcr_in()
   as was possible with the legacy pre-1.0 API.
 * 4:4:4 support in player_example using software yuv->rgb
 * Better rgb->yuv conversion in png2theora
 * Clean up warnings and local variables
 * Build and documentation fixes

libtheora 1.1.1 (2009 October 1)

 * Fix problems with MSVC inline assembly
 * Add the missing encoder_disabled.c to the distribution
 * build updates: autogen.sh should work better after switching systems
   and the MSVC project now defaults to the dynamic runtime library
 * Namespace some variables to avoid conflicts on wince.

libtheora 1.1.0 (2009 September 24)

 * Fix various small issues with the example and telemetry code
 * Fix handing a zero-byte packet as the first frame
 * Documentation cleanup
 * Two minor build fixes

libtheora 1.1beta3 (2009 August 22)

 * Rate control fixes to smooth quality
 * MSVC build now exports all of the 1.0 api
 * Assorted small bug fixes

libtheora 1.1beta2 (2009 August 12)

 * Fix a rate control problem with difficult input
 * Build fixes for OpenBSD and Apple Xcode
 * Examples now all use the 1.0 api
 * TH_ENCCTL_SET_SPLEVEL works again
 * Various bug fixes and source tree rearrangement

libtheora 1.1beta1 (2009 August 5)

 * Support for two-pass encoding
 * Performance optimization of both encoder and decoder
 * Encoder supports dynamic adjustment of quality and 
   bitrate targets
 * Encoder is generally more configurable, and all
   rate control modes perform better
 * Encoder now accepts 4:2:2 and 4:4:4 chroma sampling
 * Decoder telemetry output shows quantization choice
   and a breakdown of bitrate usage in the frame
 * MSVC assembly optimizations up to date and functional

libtheora 1.1alpha2 (2009 May 26)

 * Reduce lambda for small quantizers.
 * New encoder fDCT does better on smooth gradients
 * Use SATD for mode decisions (1-2% bitrate reduction)
 * Assembly rewrite for new features and general speed up
 * Share code between the encoder and decoder for performance
 * Fix 4:2:2 decoding and telemetry
 * MSVC project files updated, but assembly is disabled.
 * New configure option --disable-spec to work around toolchain
   detection failures.
 * Limit symbol exports on MacOS X.
 * Port remaining unit tests from the 1.0 release.

libtheora 1.1alpha1 (2009 March 27)

 * Encoder rewrite with much improved vbr quality/bitrate and
   better tracking of the target rate in cbr mode.
 * MSVC project files do not work in this release.

libtheora 1.0 (2008 November 3)

 * Merge x86 assembly for forward DCT from Thusnelda branch.
 * Update 32 bit MMX with loop filter fix.
 * Check for an uninitialized state before dereferencing in propagating
   decode calls.
 * Remove all TH_DEBUG statements.
 * Rename the bitpacker source files copied from libogg to avoid
   confusing simple build systems using both libraries.
 * Declare bitfield entries to be explicitly signed for Solaris cc.
 * Set quantization parameters to default values when an empty buffer is
   passed with TH_ENCCTL_SET_QUANT_PARAMS.
 * Split encoder and decoder tests depending on configure settings.
 * Return lstylex.sty to the distribution.
 * Disable inline assembly on gcc versions prior to 3.1.
 * Remove extern references for OC_*_QUANT_MIN.
 * Make various data tables static const so they can be read-only.
 * Remove ENCCTL codes from the old encoder API.
 * Implement TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE ctl.
 * Fix segfault when exactly one of the width or height is not a multiple
   of 16, but the other is.
 * Compute the correct vertical offset for chroma.
 * cpuid assembly fix for MSVC.
 * Add VS2008 project files.
 * Build updates for 64-bit platforms, Mingw32, VS and XCode.
 * Do not clobber the cropping rectangle.
 * Declare ourselves 1.0final to pkg-config to sort after beta releases.
 * Fix the scons build to include asm in libtheoradec/enc.

libtheora 1.0beta3 (2008 April 16)

 * Build new libtheoradec and libtheoraenc libraries
   supporting the new API from theora-exp. This API should
   not be considered stable yet.
 * Change granule_frame() to return an index as documented.
   This is a change of behaviour from 1.0beta1.
 * Document that granule_time() returns the end of the
   presentation interval.
 * Use a custom copy of the libogg bitpacker in the decoder
   to avoid function call overhead.
 * MMX code improved and ported to MSVC.
 * Fix a problem with the MMX code on SELinux.
 * Fix a problem with decoder quantizer initialization.
 * Fix a page queue problem with png2theora.
 * Improved robustness.
 * Updated VS2005 project files.
 * Dropped build support for Microsoft VS2003.
 * Dropped build support for the unreleased libogg2.
 * Added the specification to the autotools build.
 * Specification corrections.

libtheora 1.0beta2 (2007 October 12)

 * Fix a crash bug on char-is-unsigned architectures (PowerPC)
 * Fix a buffer sizing issue that caused rare encoder crashes
 * Fix a buffer alignment issue
 * Build fixes for MingW32, MSVC
 * Improved format documentation.

libtheora 1.0beta1 (2007 September 22)

 * Granulepos scheme modified to match other codecs. This bumps
   the bitstream revision to 3.2.1. Bitstreams marked 3.2.0 are
   handled correctly by this decoder. Older decoders will show
   a one frame sync error in the less noticeable direction.

libtheora 1.0alpha8 (2007 September 18)

 * Switch to new spec compliant decoder from theora-exp branch.
   Written by Dr. Timothy Terriberry.
 * Add support to the encoder for using quantization settings
   provided by the application.
 * more assembly optimizations

libtheora 1.0alpha7 (2006 June 20)

 * Enable mmx assembly by default
 * Avoid some relocations that caused problems on SELinux
 * Other build fixes
 * time testing mode (-f) for the dump_video example

libtheora 1.0alpha6 (2006 May 30)

 * Merge theora-mmx simd acceleration (x86_32 and x86_64)
 * Major RTP payload specification update
 * Minor format specification updates
 * Fix some spurious calls to free() instead of _ogg_free()
 * Fix invalid array indexing in PixelLineSearch()
 * Improve robustness against invalid input
 * General warning cleanup
 * The offset_y member now means what every application thought it meant
   (offset from the top). This will mean some old files (those with a 
   non-centered image created with a buggy encoder) will display differently.

libtheora 1.0alpha5 (2005 August 20)

 * Fixed bitrate management bugs that caused popping and encode
   errors
 * Fixed a crash problem with the theora_state internals not
   being initialized properly.
 * new utility function:
   - theora_granule_shift()
 * dump_video example now makes YUV4MPEG files by default, so
   the results can be fed back to encoder_example and similar
   tools. The old behavior is restored through the '-r' switch.
 * ./configure now prints a summary
 * simple unit test of the comment api under 'make check'
 * misc code cleanup, warning and leak fixes

libtheora 1.0alpha4 (2004 December 15)

 * first draft of the Theora I Format Specification
 * API documentation generated from theora.h with Doxygen
 * fix a double-update bug in the motion analysis
 * apply the loop filter before filling motion vector border 
   in the reference frame
 * new utility functions:
   - theora_packet_isheader(),
   - theora_packet_iskeyframe()
   - theora_granule_frame()
 * optional support for building without floating point
 * optional support for building without encode support 
 * various build and packaging fixes
 * pkg-config support
 * SymbianOS build support

libtheora 1.0alpha3 (2004 March 20)

 UPDATE: on 2004 July 1 the Theora I bitstream format was frozen. Files
 produced by the libtheora 1.0alpha3 reference encoder will always be
 decodable by the Theora I spec.

 * Bitstream info header FORMAT CHANGES:
   - move the granulepos shift field to maintain byte alignment longer.
   - reserve 5 additional bits for subsampling and interlace flags.
 * Bitstream setup header FORMAT CHANGES:
   - support for a range of interpolated quant matrices.
   - include the in-loop block filter coeff.
 * Bitsteam data packet FORMAT CHANGES:
   - Reserve a bit for per-block Q index selection.
   - Flip the coded image orientation for compatibility with VP3.
     This allows lossless transcoding of VP3 content, but files
     encoded with earlier theora releases would play upside down.
 * example VP3 lossless transcoder
 * optional support for libogg2
 * timing improvements in the example player
 * packaging and build system updates and fixes

libtheora 1.0alpha2 (2003 June 9)

 * bitstream FORMAT CHANGES:
   - store the quant tables in a third setup header for
     future encoder flexibility
   - store the huffman tables in the third setup header
   - add a field for marking the colorspace to the info header
   - add crop parameters for non-multiple-of-16 frame sizes
   - add a second vorbiscomment-style metadata header
 * API changes to handle multiple headers with a single 
   theora_decode_header() call, like libvorbis
 * code cleanup and minor fixes
 * new dump_video code example/utility
 * experimental win32 code examples

libtheora 1.0alpha1 (2002 September 25)

 * First release of the theora reference implementation
 * Port of the newly opened VP3 code to the Ogg container
 * Rewrite of the code for portability and to use the libogg bitpacker