- 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.
version 9: