Blender 4.1: Sequencer¶

Performance¶

The video Sequencer got many performance optimizations across the board.

Timeline user interface repaints 3x-4x faster for complex timelines. (df16f4931e)
Effects: Glow is 6x-10x faster (fc64f48682), Wipe is 6x-20x faster (06370b5fd6), Gamma Cross is 4x faster (9cbc96194e), Gaussian Blur is 1.5x faster (5cac8e2bb4), Solid Color is 2x faster (PR#117058).
Various parts of image transformation (1e0bf33b00, PR#117125), movie frame reading and writing (422dd9404f, 4ef5d9f60f), color management (f3ce0645e4) and audio resampling (986f493812) were sped up.
Luma Waveform display calculation is 8x-15x faster (93ca2788ff).

Image/movie filtering that is done when scaling/rotating strips has been improved.

Default strip filter is now "Auto", which automatically chooses the most appropriate filter based on scaling factors (PR#117853):
- No scale/rotation and integer positions use Nearest,
- Scaling up by more than 2x uses Cubic Mitchell,
- Scaling down by more than 2x uses Box,
- Otherwise Bilinear.
Strip transforms got Cubic filter option, previously it only existed in Transform Effect strip (PR#117100, PR#117517). Cubic filter exists in B-Spline (matches cubic elsewhere in Blender) and Mitchell (usually better for images) varieties. Cubic filtering is also faster now.
Bilinear filter no longer adds a transparent edge near image border when scaling it up. (PR#117717)
Subsampled3x3 filter was replaced by a more general Box filter, that better handles scaling images down by more than 3x. (PR#117584)
Various "off by one pixel" issues resulting in gaps between neighboring strips, or images being shifted by half a pixel, have been solved. (PR#116628)