Changes in 2.2

• HNM version 4 demuxer and video decoder
• Live HDS muxer
• setsar/setdar filters now support variables in ratio expressions
• elbg filter
• string validation in ffprobe
• support for decoding through VDPAU in ffmpeg (the -hwaccel option)
• complete Voxware MetaSound decoder
• remove mp3_header_compress bitstream filter
• Windows resource files for shared libraries
• aeval filter
• stereoscopic 3d metadata handling
• WebP encoding via libwebp
• ATRAC3+ decoder
• VP8 in Ogg demuxing
• side & metadata support in NUT
• framepack filter
• XYZ12 rawvideo support in NUT
• Exif metadata support in WebP decoder
• OpenGL device
• Use metadata_header_padding to control padding in ID3 tags (currently used in MP3, AIFF, and OMA files), FLAC header, and the AVI "junk" block.
• Mirillis FIC video decoder
• Support DNx444
• libx265 encoder
• dejudder filter
• Autodetect VDA like all other hardware accelerations
• aliases and defaults for Ogg subtypes (opus, spx)