changes.txt

从FFMPEG转换而来的H264解码程序,VC下编译..

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
 decodably 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 matricies.
   - 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