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Santhi PrakashandMiguel Ángel
cad7dbed0d
* fix(engine): warn when a video input declares alpha but decodes opaque - Problem: a video input whose alpha_mode=1 tag outlives its alpha plane (a remux drops the BlockAdditional sidecar while keeping the tag) composites as a solid rectangle, and nothing tells the user their file, not the renderer, is the problem (#3220 / #3226). - Fix: during extraction preflight, when an input declares alpha (hasAlpha) and its codec can carry alpha, sample the decoded alpha plane (up to 3 frames at 8x8 rgba, bounded 30s, ~768-byte ceiling). If uniformly opaque, emit a non-blocking stderr warning naming the file with the re-export remedy. Inconclusive probes stay silent; opaque full-frame backgrounds are legitimate and never fail the render. - Verification: 8 new unit tests (byte logic + message); engine suite 1483/1487 with 4 pre-existing failures on clean main (missing hdr-regression PNG fixture in this clone); typecheck/lint/format clean; real-fixture checks: lying-tag WebM warns, genuine-alpha WebM stays silent, both agree with ffmpeg alphaextract. Signed-off-by: Santhi Prakash <b.santhiprakash@gmail.com> * fix(engine): probe input alpha with the decoder that matches its codec * style(engine): format the alpha probe test * fix(engine): keep the alpha probe from failing or racing a render --------- Signed-off-by: Santhi Prakash <b.santhiprakash@gmail.com> Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>