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releases are sorted from youngest to oldest.
+version <next>:
+- aliases and defaults for Ogg subtypes (opus, spx)
+- HEVC/H.265 RTP payload format (draft v6) packetizer and depacketizer
+- avplay now exits by default at the end of playback
+- XCB-based screen-grabber
+- creating DASH compatible fragmented MP4, MPEG-DASH segmenting muxer
+- H.261 RTP payload format (RFC 4587) depacketizer and experimental packetizer
+- RTP/mpegts muxer
+- VP8 in Ogg demuxing
+- OpenH264 encoder wrapper
+- Support DNx100 (960x720@8)
+- DXVA2-accelerated HEVC decoding
+- AAC ELD 480 decoding
+- Intel QSV-accelerated H.264 decoding
+- DSS SP decoder and DSS demuxer
+- RTP depacketizer for AC3 payload format (RFC 4184)
+- RTP depacketizer for loss tolerant payload format for MP3 audio (RFC 5219)
+- RTP depacketizer for DV (RFC 6469)
+- Canopus HQX decoder
+
+
+version 11:
+- libx265 encoder
+- shuffleplanes filter
+- replaygain data export
+- Alias PIX image encoder and decoder
+- BRender PIX image decoder
+- Amazing Studio PAF playback support
+- XBM decoder
+- BMP standalone parser
+- OpenEXR image decoder
+- support encoding and decoding 4-channel SGI images
+- support decoding 16-bit RLE SGI images
+- VP7 video decoder
+- LucasArts SMUSH SANM video decoder
+- LucasArts SMUSH VIMA audio decoder (ADPCM)
+- LucasArts SMUSH demuxer
+- MP2 encoding via TwoLAME
+- asettb filter
+- Silicon Graphics RLE 8-bit video decoder
+- Silicon Graphics Motion Video Compressor 1 & 2 decoder
+- Silicon Graphics Movie demuxer
+- On2 AVC (Audio for Video) decoder
+- support for decoding through DXVA2 in avconv
+- libbs2b-based stereo-to-binaural audio filter
+- native Opus decoder
+- display matrix export and rotation API
+- drop avserver, it was unmaintained for years and largely broken
+- Icecast protocol
+- request Icecast metadata by default
+- support for using metadata in stream specifiers in avtools
+- Matroska 3D support
+
+
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
+- 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
+- interlace filter
- JPEG 2000 decoder
-- new asetpts filter (same as setpts, but for audio)
-- new trim and atrim filters
+- asetpts filter (same as setpts, but for audio)
+- 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
+- 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
+- Opus in Ogg demuxing
+- Enhanced Low Delay AAC (ER AAC ELD) decoding (no LD SBR support)
+- F4V muxer
+- HNM version 4 demuxer and video decoder
+- HEVC decoder
+- raw HEVC, HEVC in MOV/MP4, HEVC in Matroska, HEVC in MPEG-TS demuxing
+- remove avplay -vismv option, which has not worked for a long time
+- Live HDS muxer
+- setsar/setdar filters now support variables in ratio expressions
+- dar variable in the scale filter now returns the actual DAR (i.e. a * sar)
+- VP9 decoder
+- support for decoding through VDPAU in avconv (the -hwaccel option)
+- remove mp3_header_(de)compress bitstream filters
+- stereoscopic 3d metadata handling
+- png standalone parser
+- WebP encoding via libwebp
+- ATRAC3+ decoder
+- framepack filter
+- Mirillis FIC video decoder
+- Support DNx444
+- compand audio filter
version 9:
- 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