Variable frame rate (VFR) files have been difficult to work with.
This is because during sequential decoding, spacing between frames is
not always equal, but it was assumed to be equal. This can result in
movie getting out of sync with sound and difference between preview and
rendered image. A way to resolve these issues was to build and use
timecodes which is quite lengthy and resource intensive process. Such
issues are also difficult to communicate through UI because it is not
possible to predict if timecode usage would be needed.
With this patch, double buffer is used to keep previously decoded frame.
If current frame has PTS greater than what we are looking for, it is not
time to display it yet, and previous frame is displayed instead.
Each `AVFrame` has information about it's duration, so in theory double
buffering would not be needed, but in practice this information is
unreliable.
To ensure double buffer is always used, function
`ffmpeg_decode_video_frame_scan` is used for sequential decoding, even
if no scanning is expected.
This approach is similar to D6392, but this implementation does not
require seeking so it is much faster. Currently `AVFrame` is only
referenced, so no data is copied and therefore no overhead is added.
Note: There is one known issue where seeking fails even with double
buffering: Some files may seek too far in stream and miss requested
PTS. These require preseeking or greater negative subframe offset
Fixes: T86361, T72347
Reviewed By: zeddb, sergey
Differential Revision: https://developer.blender.org/D13583
full scaled image isn't used anymore. It was added to use a different scale when
displaying an image in the image editor. This was replaced by the image engine
redesign.
This change will reduce complexity of {T98375}.
* Port over new code tables from Cycles
* Convert Rec.709 to scene linear for lookup table.
* Move code for wavelength and blackbody to IMB so they can access the
required transforms, which are not in blenlib.
* Remove clamping from blackbody shader to bypass the texture read.
Since it's variable now easiest to just always read from the texture
than pass additional parameters.
* Fold XYZ to RGB conversion into the wavelength table.
Ref T68926
* Rename ambiguous rgb to scene_linear in some places
* Precompute matrices to directly go to scene instead of through XYZ
* Make function signatures more consistent
Between scene linear and sRGB, XYZ, linear Rec.709 and ACES2065-1.
And add some clarifications about color spaces in the docs.
Fixes T98267
Ref T68926
Differential Revision: https://developer.blender.org/D14989
Specialized thumbnailing function to create previews of all EXR image
files, regardless of type, size, or dimensions. Uses less RAM by only
loading a single row of pixels at a time.
See D14663 for more details and examples.
Differential Revision: https://developer.blender.org/D14663
Reviewed by Brecht Van Lommel
In this case memory past the buffer bounds would have been written,
potentially crashing. Replace the check with an assert since this
should never happen.
Also don't call exit as failing to write a file shouldn't exit Blender.
* Respect the image file color space setitng for saving in various cases where
it was previously ignored. Previously it would often use the sRGB or Linear
color space even when not selected.
* For the Save As operator, add a Color Space option in the file browser to
choose the color space of the file. Previously this was chosen automatically,
now it's possible to e.g. resave a Linear image as Linear ACES.
* When changing the file format, the colorspace is automatically changed to an
appropriate color space for the file format. This already happened before, but
there was no visibility or control in the operator settings for this.
* Don't change color space when using the Save operator to save over the same
file.
* Fix missing color space conversion for 16 bit PNGs, where it assumed wrongly
assumed ibuf->rect would be used for saving. Add BKE_image_format_is_byte to
more accurately test this.
Fixes T74610
Ref T68926
Differential Revision: https://developer.blender.org/D14899
For some reasons the mipmap count was not set to max during creation.
Probably it was mistaken with the UDIM tilemap texture which is only
1D and has only one mipmap.
Make preview thumbnails of JPEG files in less time and with less RAM.
See D14727 for more details.
Differential Revision: https://developer.blender.org/D14727
Reviewed by Brecht Van Lommel
Isolate frame writing task so that multithreaded image operations don't cause
the thread to start writing another frame. If that happens we may reach the
MAX_SCHEDULED_FRAMES limit, and cause the render thread and writing threads to
deadlock waiting for each other.
Additionally, don't set task priority to low because this may cause the task
scheduler to be slow in scheduling the write and color management tasks.
* Don't assume the display colorspace name fully defines the transform
to display space, this is not true in OpenColorIO 2 where view transforms
may be defined in more complexs ways than just specifying a colorspace.
* In places where we need to store the display colorspace name, resolve
<USE_DISPLAY_NAME> token manually.
Ref T96590
Currently only supports single image frames (no animation possible).
If quality slider is set to 100 then lossless compression will be used,
otherwise lossy compression is used.
Gives about 35% reduction of filesize save when re-saving splash screens with lossless
compression.
Also saves much faster, up to 15x faster than PNG with a better compression ratio as a plus.
Note, this is currently left disabled until we have WebP libs (see T95206)
For testing precompiled libs can be downloaded from Google:
https://storage.googleapis.com/downloads.webmproject.org/releases/webp/index.html
Differential Revision: https://developer.blender.org/D1598
