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
version 9: