Changes in 3.3

• CrystalHD decoder moved to new decode API
• add internal ebur128 library, remove external libebur128 dependency
• Pro-MPEG CoP #3-R2 FEC protocol
• premultiply video filter
• Support for spherical videos
• configure now fails if autodetect-libraries are requested but not found
• PSD Decoder
• 16.8 floating point pcm decoder
• 24.0 floating point pcm decoder
• Apple Pixlet decoder
• QDMC audio decoder
• NewTek SpeedHQ decoder
• MIDI Sample Dump Standard demuxer
• readeia608 filter
• Sample Dump eXchange demuxer
• abitscope multimedia filter
• Scenarist Closed Captions demuxer and muxer
• threshold filter
• midequalizer filter
• Optimal Huffman tables for (M)JPEG encoding
• VAAPI-accelerated MPEG-2 and VP8 encoding
• FM Screen Capture Codec decoder
• native Opus encoder
• ScreenPressor decoder
• incomplete ClearVideo decoder
• Intel QSV video scaling and deinterlacing filters
• Support MOV with multiple sample description tables
• XPM decoder
• Removed the legacy X11 screen grabber, use XCB instead
• MPEG-7 Video Signature filter
• Removed asyncts filter (use af_aresample instead)
• Intel QSV-accelerated VP8 video decoding
• VAAPI-accelerated deinterlacing