In the previous commit, we added a dialog to give users options when dropping
footage on a sequence-less timeline panel. However some users will have a
preferred behavior that they'd want every time without having to go through
the messagebox, so we add a "don't ask again" option that stores the setting
in the application config.
If there was anything that 0.1.x taught me, it was that a substantial number of
users did not understand that a new sequence was being made by dropping footage
onto an empty timeline and wouldn't know what to do if they wanted parameters
that differed from the footage they dragged in. This dialog makes the operation
clear and gives users an option to set the parameters on drop for convenience.
Improves viewer appearance and performance. Rather than using a timer roughly
set to the sequence's frame rate to update the viewer, the viewer synchronizes
itself to the display's refresh rate resulting in much smoother playback.
Fixes a number of playback stuttering and general UI lag issues by setting all
background tasks to IdlePriority rather than LowPriority. While it was assumed
LowPriority tasks would always get scheduled below NormalPriority (e.g. main
thread) tasks, it turns out this is not always the case. If the background tasks
start consuming a lot of CPU cycles, the scheduler may use "dynamic scheduling"
to schedule them above the main thread regardless leading to UI lag. This is
apparently the case for all thread priorities apart from IdlePriority, which
is allegedly a special case where threads are *only* scheduled when other
threads aren't busy ensuring the main thread stays responsive.
An earlier commit addressed faulty TaskViewItem ordering by changing
insertWidget to addWidget. Turns out this was the wrong strategy since the
insert was used to get widgets above the stretch. The correct strategy is
using insert(count()-1) instead of insert(0)
functions
Indexing is a lengthy process and had a high chance of getting RenderWorkers
stuck doing it rather than being responsive to cache requests. This commit
introduces a system where workers never index media, but instead signal that
media is not ready to their RenderBackends which ensure that the media gets
indexed and re-queues the affected frames when those indexes are ready.
itsmattkc