mrViewer 6.2.1 + x64 + Portable

- Fixed stepping with cursor keys leading to missing frames.
(Regression from v6.2.0).
- Fixed adding new audio to a movie or sequence (Regression from
v6.1.7).
- Removed libharfbuzz from the distribution as it was conflicting
with newer OSes (like Fedora 35).

- Made reel window reflect the first and last frames of the media
instead of the full start and end frames.
- Fixed reel window not sorting out images correctly when they were
moved and not positioning them in the timeline correctly.
- Fixed timeline not reflecting the image picked in the reel window
when in edl mode.
- Bug fixed windows v6.0.2 release as it was crashing.
- Fixed audio closing on ending of movie files.

Bug fixed crashes related to thumbnails.
Added a first command-line video tutorial for OpenTimelineIO usage in: https://youtu.be/yXaYj406xiM

Bug fixed timeline adjustment when loading new clips which got broken on the v5.2.8 windows re-release.

Bug fixed commmand-line input of sequences to support 0010-0100 formats, improved performance of command-line sequence when it has an imposed limit. Extended support of command-line sequences to support up to 8 digits.
Bug fixed padding in sequences when a frame range is provided.
Made otio<->reel converter more solid and added features in mrViewer to support the conversion more seamlessly.
Added a first command-line video tutorial for OpenTimelineIO usage in:
https://youtu.be/yXaYj406xiM

- Fixed video cache like audio cache.  This can remove some random  crashes.- Fixed End Frame widget.  Now you can type properly and the value  will get reflected in the timeline.- Fixed an error in audio decoding.  Now it will continue without  printing out a bogus error about missing samples.- Made tick mark in timeline be properly centered on current frame.- Made FPS in Media Information window reflect the original fps value,  not the playback fps (which can be changed from the main pulldown  menu).- Fixed audio offset for both sequences and movie files.  Now it is  possible to add an audio and offset it in the EDL timeline.- Audio offset is now saved in the reel file.- FPS of sequences and videos are now saved in the reel file.- Made Autorefit image refit the image on window resize too.- Made lut creation not be recreated when a CTL .xml file is  present and the CMM is OpenColorIO.- Fixed playback of some mkv (Matroska videos) that had no PTS/DTS  available.

Bug fixed EDL playback as it had gotten broken with the new timeline algorithm. - Playback of BG images works only when the FG caches are full or, alternatively, when not using cache nor play all frames.

Reverted saving of movies with audio.
This had gotten broken when the display of in/out in the timeline was added.
Note that saving with audio has some problems in some rare movie files that create very short gaps (stutters) in the audio.
Also, saving movies with audio is slow. It is recommended you use the ffmpeg standalone that ships with mrViewer for any sort of complex audio manipulation.
Added libx265.so to Linux distribution as it was missing.
Made S/E buttons set the in and out points of the movie that is to be saved.
Made Linux distribution not use rpath anymore in any of its libraries. This makes sure LD_LIBRARY_PATH works correctly.
Updated utils/libs.rb accordingly to do it automatically.
Made GLSL shaders compatible with Mesa library on Linux, as they were reporting a bunch of errors.

Made loading of sequences much more interactive and faster. Now the GUI does not lock itself as much.
The option of missing frames now is more interactive. It only needs to clear the cache to refresh the image gaps. There's no need to quit mrViewer.

An identical release to v4.2.6 but adds some missing DLLs in the Windows releases.

- Native file requester on Windows does not leave their menus open
   and obstructing the view.
 - Previous channel hotkey now works correctly on Color channel when
   this channel is in the middle of the channel list.
 - Previous channel hotkey now works correctly on Color channel when
   the following channel would be alpha overlay (no more than RGBA
   is loaded).
 - Previous channel hotkey now works correctly on Color channel when
   the following channel would be a lumma (RGB or Y,RY,BY only is
   loaded).
 - Bug fixed IFF image reader to work as all other image readers,
   reading the header chunk on each fetch.  Improved the fetching to
   only fetch once instead of twice as before.
 - Made all shortcuts be a toggle (Z, N, C, R, G, B, A, L and V)
   between their counter parts and the previously selected channel.
 - Made image switching keep the layer selected when possible.  Note
   that this feature does not always work particularly when toggling
   the shortcuts (specially when dealing with multipart openexrs),
   so it should be considered alpha.
 - Made use OCIO button be like the rest of the buttons instead of
   a gray one.

- Bug fixed a crash when reading corrupt EXR files. - Reversed the order of lut baking/gamma change in MIFF, TIFF,   PIC and PSD. - Removed a debugging message printing "f " and the frame when   playback started. - Improved performance of ocio baking by avoiding gamma changes   too, unless they are needed. - Added T (toggle lut) shortcut to list of shortcuts. - Added Ctrl+p (toggle pixel ratio) to list of shortcuts. - Made the S and E buttons (and the corresponding I and O   shortcuts) set the start/end frame of the timeline but not by   shrinking the timeline, but by highlighting the area instead.   This is a preference option in:   Preferences->Playback->Timeline->Selection.

Improved loop sync in fg/bg image playback.
Improved loop sync in 3D stereo playback.
Made loop work in time instead of frames. That allows looping properly two different videos with different fps.
Made a change in GLEW initialization which should improve OpenGL compatibility.