5.0-RC3

Compiled with a more full features FFmpeg this time.
Known issues:

• Interlaced h264 broken
• rff handling broken
• vc1 probably a bit broken

5.0-RC2

Fix delay calculation for sliced thread
Fix frame drops/duplication in CFR mode when forcing a multiple of the source framerate

5.0-RC1

Update changelog and version number

2.40

• 2.40
  • Avisynth+ linux support (qyot27)
  • Added LastEndTime track property to make it possible to take the last frame's duration into account (Myrsloik)
  • Removed several deprecated functions and enums from the API (Myrsloik)
  • No longer assumes sub 1 fps framerates are invalid (Myrsloik)
  • Added support for floating point format output in VapourSynth and Avisynth+ (Myrsloik)
  • Fixed issue with dropped/repeated frames in vc1 with multiple b-frames after seeking (Myrsloik)
  • Fixed issue with dropped/repeated frames in h264 when the reorder buffer size is too small (Myrsloik)
  • Improved seeking in mpeg and mpegts streams (Myrsloik)
  • Added rgb(a)p and several additional formats as output to Avisynth+ (Myrsloik)
  • Added VP9 support (Daemon404)
  • Fixed incorrectly reporting the output as limited range when it's in fact unknown and likely to be full range (Myrsloik)
  • Added mastering display metadata output (Myrsloik)
  • VapourSynth source now defaults to not outputting alpha (Myrsloik)
  • Removed the now unused demuxer, dumpmask, audiofile and utf8 arguments from the source filters (Myrsloik)
  • Removed ability to dump audio tracks (Myrsloik)
  • Fixed incorrect colorimetry metadata reported when converting the output to another colorspace (Myrsloik)
  • Sources now simply reference the index instead of copying large parts of it (Myrsloik)
  • Use new FFmpeg decoding API (Myrsloik)
  • Fixed several bugs in output format selection (Myrsloik)
  • FFMSIndex will now properly error out with invalid arguments (Myrsloik)
  • Add rotation metadata export (Myrsloik)
  • Add stereoscopic metadata export (Myrsloik)
  • Created new Visual Studio 2017 projects (Myrsloik)
  • Removed old mingw version support (Myrsloik)
  • Removed support for old FFmpeg versions (Myrsloik)
  • Removed libav support (Myrsloik)
  • Discontinuous Timestamp Support (Daemon404)
  • Add FFMS_Deinit (Daemon404)
  • Fix mid-stream parameter changes (Daemon404)
  • Fix decoding H.264 PAFF files with one field per packet (Daemon404)
  • Fix delay calculations for H.264 PAFF files (Daemon404)
  • Fix frame rate calculation for fields with one field per packet (Daemon404)

2.23.1

• Updated FFmpeg APIs used (Daemon404)
• Added new API that can read/write indexes to a memory buffer (Daemon404)
• Added support for high bitdepth output in Avisynth+ (Myrsloik)
• vapoursource: Add nfMakeLinear flag to better performance in most cases (Myrsloik)
• Remove bad colorspace matrix guessing for YUV (Myrsloik)
• Tell libavformat to discard packets we don't want (Daemon404)
• Restore original FFCopyrightInfringement behavior (Myrsloik)
• Make FFMS_Init threadsafe (Daemon404)
• Support latest libav* APIs (Daemon404)

2.22

• Fix possible off by 1 frame until first seek issue introduced in 2.21 (Myrsloik)
• avisynth: Make FFMS2 a shorter alias for FFmpegSource2 to save some typing (Myrsloik)
• avisynth: Moved all source functions in ffms2.avsi into the actual plugin (Myrsloik)
• avisynth: Use 2.6 RC API and add output support for all new colorspaces (Myrsloik)
• vapoursource: Fix swapped RGB channels bug introduced in 2.21 (Myrsloik)
• swscale: Drop pointless and slow bitexact flag from resizer settings (kodabb)
• Add support for files with gaps between the audio packets (Plorkyeran)

2.21

Mostly maintenance bug fixes and a much newer FFmpeg version, but there's also new API stuff for indexing files to support files with more than 32 tracks. The non-FFmpeg Matroska, MPEG-TS and OGM parsers have been dropped since these days libavformat's are good enough (and sometimes better).

• Add missing constants for log levels (Myrsloik)
• Fix bad decoder flush that discards the palette of raw video (Myrsloik)
• Remove the SWScale function from Avisynth since SWScale is useless (Myrsloik)
• Fix common framerate correction (Myrsloik)
• vapoursource: The framerate and frame durations are now normalized (Myrsloik)
• vapoursource: Add support for outputting the alpha channel too (Myrsloik)
• vapoursource: Fix resizer selection so bicubic isn't always used (Myrsloik)
• vapoursource: Set chroma location and full colorspace information (Myrsloik)
• Add support for indexing files with more than 32 tracks and the possibility to skip indexing of video tracks (Myrsloik)
• The Avisynth plugin now sets all per frame variables in all modes to avoid ugly and slow FFInfo() errors (Myrsloik)
• vapoursource: Fix crash on single frame files (Myrsloik)
• Remove the Matroska and Haali demuxers (qyot27, Plorkyeran)
• Fix adjustments for positive audio delay (tophf)
• Don't try to index video tracks in unsupported formats (Daemon404)
• Don't use scientific notation in timecode files (Daemon404)
• Fix utf8 support in FFVideoSource (nixxquality)
• Improve handling of files where only some packets have timestamps (Plorkyeran)
• Fix memory leaks in the VapourSynth error handling (Plorkyeran)

ICL version is typically ~10% faster on Intel CPUs, but is less tested.

FFMS 2.20

• Add support for Opus in MKV when ffmpeg/libav are built with libopus (qyot27)
• vapoursource: Provide _AbsoluteTime metadata (Daemon404)
• Fix a pile of small things found by Coverity (Daemon404)
• Add support for HEVC in MKV (qyot27)
• Fix infinite loop on garbage data at the beginning of AAC files (Plorkyeran)
• Deal with the never-ending bitrot from FFmpeg/Libav API changes (Daemon404, Plorkyeran)
• Make indexes not arch-specific and trivially smaller (Plorkyeran)
• Fix bug where the first b-frame was replaced with the frame before it with open-gop h.264 (Plorkyeran)
• Fix seeking issues with open-gop h.264 (Plorkyeran)
• Fix corruption when seeking in interlaced h.264 (Plorkyeran)
• Add support for multiple frames per audio packet as FFmpeg seems to have started doing that (Plorkyeran)
• Fix seeking in Y4M files (Plorkyeran)
• Fix dumping audio while indexing files
• Add support for Matroska files with extremely large CodecPrivate sections
• Speed up indexing Matroska files a bit

The ICL version is approximately 10% faster on Intel CPUs, while the MSVC version is probably faster on AMD CPUs (but I do not have any available to test with).

FFMS 2.19.1

Fixes an infinite loop when decoding AAC with FFmpeg 2.2.

FFMS 2.19

2.18 can't be compiled with anything but MSVC. This can.