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• swscale : use 16-bit intermediate precision for RGB/XYZ conversion

  16 décembre 2024, par Niklas Haas

  swscale : use 16-bit intermediate precision for RGB/XYZ conversion
  The current logic uses 12-bit linear light math, which is woefully insufficient
  
  and leads to nasty postarization artifacts. This patch simply switches the
  
  internal logic to 16-bit precision.
  This raises the memory requirement of these tables from 32 kB to 272 kB.
  All relevant FATE tests updated for improved accuracy.
  Fixes : #4829
  
  Signed-off-by : Niklas Haas <git@haasn.dev>
  
  Sponsored-by : Sovereign Tech Fund
  

  • [DH] libswscale/swscale.c
  • [DH] libswscale/swscale_internal.h
  • [DH] libswscale/utils.c
  • [DH] tests/ref/fate/filter-pixdesc-xyz12be
  • [DH] tests/ref/fate/filter-pixdesc-xyz12le
  • [DH] tests/ref/fate/filter-pixfmts-copy
  • [DH] tests/ref/fate/filter-pixfmts-crop
  • [DH] tests/ref/fate/filter-pixfmts-field
  • [DH] tests/ref/fate/filter-pixfmts-fieldorder
  • [DH] tests/ref/fate/filter-pixfmts-hflip
  • [DH] tests/ref/fate/filter-pixfmts-il
  • [DH] tests/ref/fate/filter-pixfmts-null
  • [DH] tests/ref/fate/filter-pixfmts-scale
  • [DH] tests/ref/fate/filter-pixfmts-transpose
  • [DH] tests/ref/fate/filter-pixfmts-vflip
  • [DH] tests/ref/pixfmt/gbrp-xyz12le
  • [DH] tests/ref/pixfmt/gbrp10-xyz12le
  • [DH] tests/ref/pixfmt/gbrp12-xyz12le
  • [DH] tests/ref/pixfmt/rgb24-xyz12le
  • [DH] tests/ref/pixfmt/rgb48-xyz12le
  • [DH] tests/ref/pixfmt/xyz12le
  • [DH] tests/ref/pixfmt/yuv444p-xyz12le
  • [DH] tests/ref/pixfmt/yuv444p10-xyz12le
  • [DH] tests/ref/pixfmt/yuv444p12-xyz12le

• FFMPEG merge audio tracks into one and encode using NVENC

  5 novembre 2019, par L0Lock

  I often shoot films with several audio inputs, resulting in video files with multiple audio tracks supposed to be played all together at the same time.
  I usually go through editing those files and there I do whatever I want with those files, but sometimes I would also like to just send the files right away online without editing, in which case I would enjoy FFMPEG’s fast & simple & quality encoding.

  But here’s the catch : most online video streaming services don’t support multiple audio tracks, so I have to merge them into one so we can hear everything.

  I also want to upscale the video (it’s a little trick for the streaming service to trigger its higher quality encoding).
  And finally, since it’s just an encoding meant to just be shared on a streaming service, I prefer a fast & light encoding over quality, which HEVC NVENC is good for.

  So far I’ve tried to use the amix advanced filter and I try to use the Lanczos filter for upscaling which seems to give a better result in my case.

  The input file is quite simple :

  Stream 0:0 : video track
  Stream 0:1 : main audio recording
  Stream 0:2 : secondary audio recording

  The audio tracks are at the correct volume and duration and position in time, so the only thing I need is really just to turn them into one track

  ffmpeg -i "ow_raw.mp4" -filter_complex "[0:1][0:2]amix=inputs=2[a]" -map "0:0" -map "[a]" -c:v hevc_nvenc -preset fast -level 4.1 -pix_fmt yuv420p -vf scale=2560:1:flags=lanczos "ow_share.mkv" -y

  But it doesn’t work :

  ffmpeg version N-94905-g8efc9fcc56 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 35.100 / 56. 35.100
  
    libavcodec     58. 56.101 / 58. 56.101
  
    libavformat    58. 32.104 / 58. 32.104
  
    libavdevice    58.  9.100 / 58.  9.100
  
    libavfilter     7. 58.102 /  7. 58.102
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ow_raw.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2019-11-02T16:43:32.000000Z
  
      date            : 2019
  
    Duration: 00:15:49.79, start: 0.000000, bitrate: 30194 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/smpte170m/bt470m), 1920x1080 [SAR 1:1 DAR 16:9], 29805 kb/s, 60 fps, 60 tbr, 90k tbn, 120 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-11-02T16:43:32.000000Z
  
        handler_name    : VideoHandle
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-11-02T16:43:32.000000Z
  
        handler_name    : SoundHandle
  
      Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 184 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-11-02T16:43:32.000000Z
  
        handler_name    : SoundHandle
  
  Stream mapping:
  
    Stream #0:1 (aac) -> amix:input0 (graph 0)
  
    Stream #0:2 (aac) -> amix:input1 (graph 0)
  
    Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc))
  
    amix (graph 0) -> Stream #0:1 (libvorbis)
  
  Press [q] to stop, [?] for help
  
  [hevc_nvenc @ 000002287e34a040] InitializeEncoder failed: invalid param (8)
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

• Intercept ffmpeg stdout with Process() in Swift

  3 avril 2021, par TAFKAS

  I've to admit that I'm quite inexperienced in Swift, but nonetheless I'm trying to build an OS X app to convert a video in a particular format and size with ffmpeg using Swift.
My goal is to have the ffmpeg stdout in a separate window to show the progress to the user.
Before posting here, I've read all that exist on the internet about the subject :-) and I've not found yet a solution to my problem of not having any output whatsoever in my textView but only in the Xcode console.
I've found this post here :
Real time NSTask output to NSTextView with Swift
that seems very promising but is not working anyway. I've tried to use the command /bin/sh in the example with the provided arguments in my code and it works like a charm. Probably it's me and my inexperience, but I think that is something related to the way ffmpeg output his progress, that won't work. It seems that even removing the -v and -stat options the ffmpeg command still output to the Xcode console but not in my TextField.
I hope that someone can shed a light in my swift coding darkness.
Thanks in advance

  


  STEFANO

  


  UPDATE - SOLVED

  


  I had an EUREKA moment and I've assigned the pipe to the standarderror and voilà it worked

  


  import Cocoa

var videoLoadURL = ""

class ViewController: NSViewController {
   @IBOutlet weak var filenameLabel: NSTextField!
   @IBOutlet weak var progressText: NSTextField!
   @IBOutlet weak var progressIndicator: NSProgressIndicator!

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    progressIndicator.isHidden = true
    
}

@IBAction func loadVIdeo(_ sender: NSButton) {
    
    let openPanel = NSOpenPanel()
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseFiles = true
    openPanel.runModal()
    
    if let path = openPanel.url?.lastPathComponent {
        
        filenameLabel.stringValue = path
    }
    
    if let path = openPanel.url?.absoluteURL {
        
        videoLoadURL = path.absoluteString

    }

}

@IBAction func convert(_ sender: NSButton) {
    
    progressIndicator.isHidden = false
    let savePanel = NSSavePanel()
    var videoSaveURL: String = ""
    savePanel.nameFieldStringValue = "Converted_\(filenameLabel.stringValue).mp4"
    savePanel.runModal()
    
    if let path = savePanel.url?.absoluteURL {
        
        videoSaveURL = path.absoluteString
    }

    let startLaunch: CFTimeInterval = CACurrentMediaTime()
    
    progressIndicator.startAnimation(self)
    
    let task = Process()
    task.launchPath = "/usr/local/bin/ffmpeg"
    task.arguments = ["-i", "\(videoLoadURL)", "-y", "-g", "1", "-crf", "29","-b", "0", "-pix_fmt", "yuv420p", "-strict", "-2", "\(videoSaveURL)"]
    let pipe = Pipe()
    task.standardError = pipe
    let outHandle = pipe.fileHandleForReading
    outHandle.waitForDataInBackgroundAndNotify()

    var observer1: NSObjectProtocol!
    observer1 = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSFileHandleDataAvailable, object: outHandle, queue: nil, using: { notification -> Void in
        let data = outHandle.availableData
        if data.count > 0 {
            
            if let str = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
                
                self.progressText.stringValue = str as String
                
            }
            
            outHandle.waitForDataInBackgroundAndNotify()
            
        } else {
            
            print("EOF on stdout from process")
            NotificationCenter.default.removeObserver(observer1)
        }
        
    })

    var observer2: NSObjectProtocol!
    observer2 = NotificationCenter.default.addObserver(forName: Process.didTerminateNotification, object: task, queue: nil, using: { notification -> Void in
        
        print("terminated")
        NotificationCenter.default.removeObserver(observer2)

    })

    do {
        
        try task.run()
        
    }catch {
        
        print("error")
    }
    
    task.waitUntilExit()
    
    let elapsedTime: CFTimeInterval = CACurrentMediaTime() - startLaunch
    NSSound.beep()
    progressIndicator.stopAnimation(self)
    progressIndicator.isHidden = true
    if task.terminationStatus == 0 {
        
        let alertOK = NSAlert()
        alertOK.messageText = "Tutto bene"
        alertOK.addButton(withTitle:"OK")
        alertOK.addButton(withTitle: "Cancel")
        alertOK.informativeText = "Conversione eseguita in \(elapsedTime) secondi"
        alertOK.runModal()
        
    } else {
        
        let alertOK = NSAlert()
        alertOK.messageText = "Errore"
        alertOK.addButton(withTitle:"OK")
        alertOK.informativeText = "La conversione è fallita"
        alertOK.runModal()
        
    }
}


  


  }