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+version 10:
+- av_strnstr
+- support ID3v2 tags in ASF files
+- reference-counting for AVFrame and AVPacket data
+- avconv now fails when input options are used for output file
+ or vice versa
+- new avconv options -filter_script and -filter_complex_script, which allow a
+ filtergraph description to be read from a file
+- uniform options syntax across all filters
+- new interlace filter
+- JPEG 2000 decoder
+- new asetpts filter (same as setpts, but for audio)
+- new trim and atrim filters
+- avconv -t and -ss (output-only) options are now sample-accurate when
+ transcoding audio
+- Matroska muxer can now put the index at the beginning of the file.
+- avconv -deinterlace option removed, the yadif filter should be used instead
+- Apple Intermediate Codec decoder
+- Escape 130 video decoder
+- support for slice multithreading in libavfilter
+- VC-1 interlaced B-frame support
+- support for WavPack muxing (raw and in Matroska)
+- Go2Webinar decoder
+- WavPack encoding through libwavpack
+- Added the -n parameter to avconv
+- RTMP seek support
+- when transcoding with avconv (i.e. not streamcopying), -ss is now accurate
+ even when used as an input option. Previous behavior can be restored with
+ the -noaccurate_seek option.
+- avconv -t option can now be used for inputs, to limit the duration of
+ data read from an input file
+- incomplete Voxware MetaSound decoder
+- WebP decoder
+- Error Resilient AAC syntax (ER AAC LC) decoding
+- Low Delay AAC (ER AAC LD) decoding
+- mux chapters in ASF files
+
+
version 9:
- av_basename and av_dirname
- adobe and limelight publisher authentication in RTMP
- VDPAU hardware acceleration through normal hwaccel
+- SRTP support
version 9_beta3:
- LPCM support in MPEG-TS (HDMV RID as found on Blu-ray disks)
- WMA Pro decoder
- Core Audio Format demuxer
-- Atrac1 decoder
+- ATRAC1 decoder
- MD STUDIO audio demuxer
- RF64 support in WAV demuxer
- MPEG-4 Audio Lossless Coding (ALS) decoder
- MXF demuxer
- VC-1/WMV3/WMV9 video decoder
- MacIntel support
-- AVISynth support
+- AviSynth support
- VMware video decoder
- VP5 video decoder
- VP6 video decoder
- Interplay C93 demuxer and video decoder
- Bethsoft VID demuxer and video decoder
- CRYO APC demuxer
-- Atrac3 decoder
+- ATRAC3 decoder
- V.Flash PTX decoder
- RoQ muxer, RoQ audio encoder
- Renderware TXD demuxer and decoder