Changelog 2507 --> 2525

Features/Changes:
[Audio Encoder]        added custom command line support
[Chapter Creator]      added option to sort the title list by chapter count
[FDK-AAC Encoder]      added FDK-AAC encoder support
                       due to the FDK-AAC license the encoder will not be available in the online updater

Enhancements/Fixes:
[Chapter Creator]      cosmetics
[Chapter Creator]      improved error handling  
[HD Streams Extractor] cosmetics
[OneClick]             better support for Blu-ray playlist where eac3to and mediainfo report different track information
[OneClick]             fixed removing the wrong subtitle track when using the DEL key
[Update]               get update server configuration data from the update server itself
[Update]               if an outdated package is enabled the update will be downloaded automatically (if auto update is not disabled)
[VobSubber]            improved error handling
[x265]                 adjusted command line for recent avs4x265


Changelog 2501 --> 2507

Features/Changes:
[Update]               removed update server megui.xvidvideo.ru for the stable branch as it cannot be synced anymore
[Update]               increased update data refresh interval to 10 days for the stable server

Enhancements/Fixes:
[Adaptive Muxer]       fixed first subtitle unintended set to default. Bug #774
[Audio Encoder]        fixed wrong channel count mismatch warning for AVS files. Bug #767
[Chapter Creator]      improved multi angle Blu-Ray support
[L-SMASH Indexer]      the cache file was sometimes not deleted
[Update]               fixed freeze when adding new custom update servers. Bug #769
[Update]               improved runtime copying process


Changelog 2419 --> 2500

Features/Changes:
[Update]               several changes have been made to save bandwidth during the update process:
[Update]               - update data will only be refreshed every 1 (development) or 5 (stable) days
[Update]               - all optional packages are disabled by default
[Update]               - optional packages will only be downloaded/enabled if needed
[Update]               - therefore during first use of such packages an online connection may be required
[Update]               - if a package is not used in 60 days it will be disabled again
[Update]               - if external tools are disabled in the settings they are also disabled for updates
[Update]               - required packages are always enabled
[L-SMASH Indexer]      added LSMASHVideoSource/LWLibavVideoSource support
[L-SMASH Indexer]      the cache file must be created in the same directory as the source file
[L-SMASH Indexer]       therefore the indexer will be blocked if the input file is in a read only directory
[L-SMASH Indexer]      it will be used after FFMS (default priority)
[x265]                 added basic x265 encoding support
[x265]                 added option to enable/disable x265 in the MeGUI settings (disabled by default)

Enhancements/Fixes:
[Audio Encoder]        added 5.1 downmix if necessary (provided by tebasuna51)
[Audio Encoder]        added 96000 Hz sample rate conversion. Feature request #538
[Audio Encoder]        added AddAutoloadDir() if using the included AviSynth+
[Audio Encoder]        added dedicated TimeStretch options
[Audio Encoder]        added LSMASHAudioSource/LWLibavAudioSource support
[Audio Encoder]         default order: NicAudio, BassAudio, FFAudioSource, LWLibavAudioSource, DirectShow
[Audio Encoder]        fixed TimeStretch support (regression of 2383)
[AVI Muxer]            improved logging
[AVS Script Creator]   fixed "TDeint (with EDI)" (regression of 2305)
[AVS Script Creator]   fixed sometimes using VobSub instead of TextSub
[AVS Script Creator]   improved anamorphic calculation. if the output DAR is the same as the input DAR
[AVS Script Creator]    it will not be rounded within the "acceptable anamorphic aspect error" tolerance
[Chapter Creator]      added option to specify the FPS value and the minimum title length
[Chapter Creator]      added support for mkv input files
[Chapter Creator]      improved FPS detection for DVD/Bluray
[FFMS Indexer]         added fpsnum and fpsden if required
[FFMS Indexer]         automatically switch to LoadCPlugin if required
[FFMS Indexer]          defaults to LoadPlugin if LoadCPlugin is also possible
[FFMS Indexer]         do not index audio tracks if they will be demuxed
[HD Streams Extractor] fixed using wrong source file in file mode if more than one job is added with "and close" disabled
[HD Streams Extractor] last used open mode will be preselected
[Log]                  added AviSynth+ detection
[Log]                  delete devil.dll in the MeGUI root folder if avisynth.dll is not available also
[Log]                  do not log progress messages from the FFmpeg encoder
[Log]                  removed information about highest .NET build
[Log]                   show information about .NET 2.0 and 4.0 instead
[M2TS Muxer]           added HEVC/x265 and MKV support (requires tsmuxer 2.5.5+)
[MainForm]             enabled Drag & Drop for folders
[MKV Demuxer]          if a delay is needed e.g. "Delay 123ms" (instead of "123ms") will be added to the demuxed file name
[MKV Muxer]            added HEVC support (requires mkvmerge 6.8.0+)
[OneClick]             "Don't encode video" is now used for all containers
[OneClick]             added HEVC/x265 support for MP4 and MKV
[OneClick]             changed resize behaviour so that upsizing will be used if enabled
[OneClick]             fixed PCM audio track handling in mkv files (regression of 2378)
[OneClick]             fixed problem if using the same internal audio track several times
[OneClick]             fixed unnecessary resize/crop in some cases (regression of 2357)
[OneClick]             improved detection/handling of suitable output containers
[OneClick]             improved working directory generation
[OneClick]             improved anamorphic calculation. if the output DAR is the same as the input DAR
[OneClick]              it will not be rounded within the "acceptable anamorphic aspect error" tolerance
[QAAC]                 allow only specific TVBR values. Please verify your settings.
[Queue]                changed default main window size and queue column size
[Queue]                fixed crash if more than one worker is opening an avs script
[Queue]                removed general check for missing packages at queue start
[Settings]             added option to always use the included/portable AviSynth build (disabled by default)
[Settings]             removed "Force Video File Extension for QT compatibility"
[Settings]             removed "Samples between audio progress updates"
[Settings]             removed "Use Advanced ToolTips"
[Update]               added "Last Used" column
[Update]               added download progress indicator
[Update]               added option to hide the question if you would like to update
[Update]               added possibility to use .NET requirements for the update files
[Update]               added possibility to use display names for the update files
[Update]               added sortable columns
[Update]               removed "Platform" column
[Update]               merged some avisynth plugins into one package
[Video Preview]        if video preview is set to "always on top" some GUI elements were hidden. Bug #754
[x264]                 custom --fps values will be detected and used
[x264]                 fixed --sar detection for 720x480 if using the Blu-ray target device
[x264]                 improved error handling. Bug #755
[XviD]                 hide FourCC box as it will not be used


Known Problems:
- Unicode is not supported
- non default DPI values are not supported
- M2TS bitrate calculator does not calculate correct values as the specifications are not known

Full changelog: 
http://sourceforge.net/p/megui/code/HEAD/tree/megui/trunk/Changelog_full.txt?format=raw