- 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.
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
+- Voxware MetaSound decoder
- WebP decoder
- Error Resilient AAC syntax (ER AAC LC) decoding
- Low Delay AAC (ER AAC LD) decoding
- 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
+- libx265 encoder
version 9: