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Editorial Team
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Asked: 2026-05-25T21:00:40+00:00

I have a video that’s written using AVAssetWriter w/ kCVPixelFormatType_32ARGB and the AVVideoCodecH264 codec.

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I have a video that’s written using AVAssetWriter w/ kCVPixelFormatType_32ARGB and the AVVideoCodecH264 codec. I generate my own frames @ 25 fps for the first pass at the video. I then combine this video only asset with audio using AVAssetExportSession.

The video uploads to Facebook and plays just fine. It also works in VLC on a mac. However the quicktime player on the mac 10.0 ( 128) just hangs with the beachball of death.

VLC shows 2 streams:

  • Stream 1: video, H264 – MPEG-4 AVC ( part 10 ), 320 x 400, 25 fps
  • Stream 2: audio, apple lossless audio codec ( alac ), mono, 44100 Hz, 16 bits

Why doesn’t quicktime like this video?

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1 Answer

  1. Editorial Team

    I fixed this by switching from kAudioFormatAppleLossless to kAudioFormatMPEG4AAC.

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