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• avcodec/dvbsubdec : Fix conditions for fallback to default resolution

  3 décembre 2021, par softworkz

  avcodec/dvbsubdec : Fix conditions for fallback to default resolution
  The previous code expected a segment of type CLUT definition to exist
  
  in order to accept a set of segments to be complete.
  
  This was an incorrect assumption as the presence of a CLUT segment
  
  is not mandatory.
  
  (version 1.6.1 of the spec is probably a bit more clear about this
  
  than earlier versions : https://www.etsi.org/deliver/etsi_en/
  
  300700_300799/300743/01.06.01_20/en_300743v010601a.pdf)
  The incorrect condition prevented proper fallback to using the default
  
  resolution for the decoding context.
  This also adds variables and moves the fallback check to the outside
  
  for better clarity.
  Signed-off-by : softworkz <softworkz@hotmail.com>
  

  • [DH] libavcodec/dvbsubdec.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
        }
    }
}


  


• Revision 7ab9a9587b : Remove Wextra warnings from vp9_sad.c As a side-effect, the max_sad check is re

  13 mai 2014, par Deb Mukherjee

  Changed Paths :
   Modify /test/sad_test.cc

  
   Modify /vp8/common/rtcd_defs.pl

  
   Modify /vp8/common/sad_c.c

  
   Modify /vp8/common/variance.h

  
   Modify /vp8/encoder/mcomp.c

  
   Modify /vp8/encoder/rdopt.c

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_mbgraph.c

  
   Modify /vp9/encoder/vp9_mcomp.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_sad.c

  
   Modify /vp9/encoder/vp9_variance.h

  
  
  Remove Wextra warnings from vp9_sad.c

  As a side-effect, the max_sad check is removed from the
  C-implementation of VP8, for consistency with VP9, and to
  ensure that the SAD tests common to VP8/VP9 pass.
  That will make the VP8 C implementation of sad a little slower
  but given that is rarely used in practice, the impact will be
  minimal.

  Change-Id : I7f43089fdea047fbf1862e40c21e4715c30f07ca