Hi, Im trying to use this example (https://developer.apple.com/documentation/avfoundation/media_reading_and_writing/converting_side-by-side_3d_video_to_multiview_hevc_and_spatial_video) to encode a stereoscopic (left eye right eye) video frame using MVHEVC. The sample project creates tagged buffers for left and right eye, and uses a writer to write the MVHEC encoded video buffers. But i after i get right and left tagged buffers, i want to use VideoMaterial and its AVSampleBufferVideoRenderer to enqueue these video frames. If i render MVHEVC encoded left eye sample buffer, and right eye sample buffer, sequentially will the AVSampleBufferVideoRenderer render it as a stereoscopic view? How does this work with VideoMaterial and AVSampleBufferVideoRenderer ? Thanks!

Recently I've been trying to play some AV1-encoded streams on my iPhone 15 Pro Max. First, I check for hardware support: VTIsHardwareDecodeSupported(kCMVideoCodecType_AV1); // YES Then I need to create a CMFormatDescription in order to pass it into a VTDecompressionSession. I've tried the following: { mediaType:'vide' mediaSubType:'av01' mediaSpecific: { codecType: 'av01' dimensions: 394 x 852 } extensions: {{ CVFieldCount = 1; CVImageBufferChromaLocationBottomField = Left; CVImageBufferChromaLocationTopField = Left; CVPixelAspectRatio = { HorizontalSpacing = 1; VerticalSpacing = 1; }; FullRangeVideo = 0; }} } but VTDecompressionSessionCreate gives me error -8971 (codecExtensionNotFoundErr, I assume). So it has something to do with the extensions dictionary? I can't find anywhere which set of extensions is necessary for it to work 😿. VideoToolbox has convenient functions for creating descriptions of AVC and HEVC streams (CMVideoFormatDescriptionCreateFromH264ParameterSets and CMVideoFormatDescriptionCreateFromHEVCParameterSets), but not for AV1. As of today I am using XCode 15.0 with iOS 17.0.0 SDK.