231555 2021-10-11 21:34:51 -0700 Internals.grabNextMediaStreamTrackFrame doesn't always convert to RGBA 2021-10-18 21:35:20 -0700 1 1 1 Unclassified WebKit WebRTC WebKit Local Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 heycam webkit-unassigned webkit-bug-importer youennf oldest_to_newest 1802966 0 heycam 2021-10-11 21:34:51 -0700 I tried using Internals.grabNextMediaStreamTrackFrame for a test. It relies on MediaSample::getRGBAImageData. MediaSampleAVFObjC::getRGBAImageData does try to convert the sample's underlying CVPixelBuffer to RGBA, but it doesn't seem to work, at least for the case I was trying. When the frame was using a YUV420 pixel format, the PixelBufferConformerCV failed to do a conversion and instead produced a new CVPixelBuffer with the same format. The result is that in the test, the ImageData object passed to the grabNextMediaStreamTrackFrame Promise callback contained planar YUV data pretending to be RGBA. I failed to trace into VTPixelBufferConformerCopyConformedPixelBuffer to work out why this wasn't working. 1805880 1 webkit-bug-importer 2021-10-18 21:35:20 -0700 <rdar://problem/84400615>