I'm building a Swift video editor with AVFoundation and a custom compositor. Despite setting AVVideoComposition.frameDuration to 60 FPS, I'm seeing significant frame skipping during playback.
Console Output Shows Frame Skipping
Frame #0 at 0.0 ms (fps: 60.0)
Frame #2 at 33.333333333333336 ms (fps: 60.0)
Frame #6 at 100.0 ms (fps: 60.0)
Frame #10 at 166.66666666666666 ms (fps: 60.0)
Frame #32 at 533.3333333333334 ms (fps: 60.0)
Frame #62 at 1033.3333333333335 ms (fps: 60.0)
Frame #96 at 1600.0 ms (fps: 60.0)
Instead of frames every ~16.67ms (60 FPS), I'm getting irregular intervals, sometimes 33ms, 67ms, or hundreds of milliseconds apart.
Renderer.swift (Key Parts)
@MainActor
class Renderer: ObservableObject {
@Published var playerItem: AVPlayerItem?
private let assetManager: ProjectAssetManager?
private let compositorId: String
func buildComposition() async {
// ... load mouse moves/clicks data ...
let composition = AVMutableComposition()
let videoTrack = composition.addMutableTrack(
withMediaType: .video,
preferredTrackID: kCMPersistentTrackID_Invalid
)
var currentTime = CMTime.zero
var layerInstructions: [AVMutableVideoCompositionLayerInstruction] = []
// Insert video segments
for videoURL in videoURLs {
let asset = AVAsset(url: videoURL)
let tracks = try await asset.loadTracks(withMediaType: .video)
let assetVideoTrack = tracks.first
let duration = try await asset.load(.duration)
try videoTrack.insertTimeRange(
CMTimeRange(start: .zero, duration: duration),
of: assetVideoTrack,
at: currentTime
)
let layerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoTrack)
let transform = try await assetVideoTrack.load(.preferredTransform)
layerInstruction.setTransform(transform, at: currentTime)
layerInstructions.append(layerInstruction)
currentTime = CMTimeAdd(currentTime, duration)
}
let videoComposition = AVMutableVideoComposition()
videoComposition.frameDuration = CMTime(value: 1, timescale: 60) // 60 FPS
// Set render size from first video
if let firstURL = videoURLs.first {
let firstAsset = AVAsset(url: firstURL)
let firstTrack = try await firstAsset.loadTracks(withMediaType: .video).first
let naturalSize = try await firstTrack.load(.naturalSize)
let transform = try await firstTrack.load(.preferredTransform)
videoComposition.renderSize = CGSize(
width: abs(naturalSize.applying(transform).width),
height: abs(naturalSize.applying(transform).height)
)
}
let instruction = CompositorInstruction()
instruction.timeRange = CMTimeRange(start: .zero, duration: currentTime)
instruction.layerInstructions = layerInstructions
instruction.compositorId = compositorId
videoComposition.instructions = [instruction]
videoComposition.customVideoCompositorClass = CustomVideoCompositor.self
let playerItem = AVPlayerItem(asset: composition)
playerItem.videoComposition = videoComposition
self.playerItem = playerItem
}
}
class CompositorInstruction: NSObject, AVVideoCompositionInstructionProtocol {
var timeRange: CMTimeRange = .zero
var enablePostProcessing: Bool = false
var containsTweening: Bool = false
var requiredSourceTrackIDs: [NSValue]?
var passthroughTrackID: CMPersistentTrackID = kCMPersistentTrackID_Invalid
var layerInstructions: [AVVideoCompositionLayerInstruction] = []
var compositorId: String = ""
}
class CustomVideoCompositor: NSObject, AVVideoCompositing {
var sourcePixelBufferAttributes: [String : Any]? = [
kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_32BGRA)
]
var requiredPixelBufferAttributesForRenderContext: [String : Any] = [
kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_32BGRA)
]
func renderContextChanged(_ newRenderContext: AVVideoCompositionRenderContext) {}
func startRequest(_ asyncVideoCompositionRequest: AVAsynchronousVideoCompositionRequest) {
guard let sourceTrackID = asyncVideoCompositionRequest.sourceTrackIDs.first?.int32Value,
let sourcePixelBuffer = asyncVideoCompositionRequest.sourceFrame(byTrackID: sourceTrackID),
let outputBuffer = asyncVideoCompositionRequest.renderContext.newPixelBuffer() else {
asyncVideoCompositionRequest.finish(with: NSError(domain: "VideoCompositor", code: -1))
return
}
let videoComposition = asyncVideoCompositionRequest.renderContext.videoComposition
let frameDuration = videoComposition.frameDuration
let fps = Double(frameDuration.timescale) / Double(frameDuration.value)
let compositionTime = asyncVideoCompositionRequest.compositionTime
let seconds = CMTimeGetSeconds(compositionTime)
let frameInMilliseconds = seconds * 1000
let frameNumber = Int(round(seconds * fps))
print("Frame #\(frameNumber) at \(frameInMilliseconds) ms (fps: \(fps))")
asyncVideoCompositionRequest.finish(withComposedVideoFrame: outputBuffer)
}
func cancelAllPendingVideoCompositionRequests() {}
}
VideoPlayerViewModel
@MainActor
class VideoPlayerViewModel: ObservableObject {
let player = AVPlayer()
private let renderer: Renderer
func loadVideo() async {
await renderer.buildComposition()
if let playerItem = renderer.playerItem {
player.replaceCurrentItem(with: playerItem)
}
}
}
What I've Tried
Frame skipping is consistent—exact same timestamps on every playback
Issue persists even with minimal processing (just passing through buffers)
Occurs regardless of compositor complexity
Please note that I need every frame at exact millisecond intervals for my application. Frame loss or inconsistent frameInMillisecond values are not acceptable.
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