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• dpxenc : enforce alignment requirement

  13 août 2014, par Christophe Gisquet

  dpxenc : enforce alignment requirement
  S268M-2003 specifies that each line start is aligned on a 4-byte boundary.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/dpxenc.c

• dpx : use aligned line starts

  13 août 2014, par Christophe Gisquet

  dpx : use aligned line starts
  SMPTE 268M-2003 specifies that each line starts at a 4-bytes boundary.
  
  Therefore, modify correspondingly the input buffer strides and size.
  Partially fixes ticket #3692 : DLAD_8b_3c_big.dpx still has inverted
  
  colors, which might be related to endianness.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/dpx.c

• How can I generate a metadata.mov file for higher-resolution Live Photos (e.g. 1440x2560) ?

  30 juillet, par brijesh patel

  I'm generating Live Photos programmatically for use as wallpapers on iOS. I'm using a known metadata.mov file bundled with the app (likely extracted from a working Live Photo with resolution 1080x1920). This setup works fine when I use a video of the same resolution.

  


  I'm using this open-source library to handle the video-to-LivePhoto conversion :
  
https://github.com/TouSC/Video2LivePhoto

  


  However, when I try using a higher-resolution video (e.g. 2560x1440) to avoid black bars on high-resolution devices (like iPhone 14 Pro Max), the Photos app shows the Live Photo, but the motion component doesn't work—it just says “Motion Not Available.”

  


  I believe the issue is that the static metadata.mov contains resolution-specific metadata, which prevents it from working correctly with other video sizes.

  


  


  • Tried changing the resolution of the video (e.g. 1440x2560, 1284x2778) – motion breaks.

    


  


  • Tried generating a new .mov file using FFmpeg with a silent video track, matching the new resolution – Live Photo not recognized or shows errors.

    


  


  • Tried modifying the existing metadata.mov with tools like FFmpeg, AtomicParsley, Bento4, and mp4box – resulting files often break the Live Photo entirely.

    


  


  • I expected to generate a valid metadata.mov (or similar track) that would support the custom resolution and restore Live Photo motion support.

    


  


  


  static func convertVideo(videoURL: URL, complete: @escaping (_ success: Bool, _ errorMessage: String?) -> Void) {
    print("start converting")
    
    guard let metaURL = Bundle.main.url(forResource: "metadata", withExtension: "mov") else {
        complete(false, "metadata.mov not found")
        return
    }

    let livePhotoSize = CGSize(width: 1440, height: 2560) // <-- updated resolution
    let livePhotoDuration = CMTime(value: 550, timescale: 600)
    let assetIdentifier = UUID().uuidString

    guard let documentPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first else {
        complete(false, "Document path not found")
        return
    }

    let durationPath = documentPath + "/duration.mp4"
    let acceleratePath = documentPath + "/accelerate.mp4"
    let resizePath = documentPath + "/resize.mp4"
    let finalPath = resizePath

    removeFileIfExists(at: durationPath)
    removeFileIfExists(at: acceleratePath)
    removeFileIfExists(at: resizePath)

    let converter = Converter4Video(path: finalPath)

    Task {
        do {
            try await converter.durationVideo(at: videoURL, outputPath: durationPath, targetDuration: 3)
            try await converter.accelerateVideo(at: durationPath, to: livePhotoDuration, outputPath: acceleratePath)
            try await converter.resizeVideo(at: acceleratePath, outputPath: resizePath, outputSize: livePhotoSize)

            print("### resize Success")
            let image = try await generateCGImage(finalPath: finalPath)

            await generateLivePhoto(
                image: image,
                documentPath: documentPath,
                assetIdentifier: assetIdentifier,
                metaURL: metaURL,
                converter: converter,
                complete: complete
            )
        } catch {
            print("Video conversion error: \(error)")
            complete(false, error.localizedDescription)
            return
        }
    }
}