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• Read ID3 tags generated using Apple's id3taggenerator

  9 octobre 2024, par Damiaan Dufaux

  Hi I am creating an HLS stream with ID3 tags using Apple's HTTP Live Streaming (HLS) Tools, FFmpeg and NodeJS. When I try to read out the stream using an AVPlayer and AVPlayerItemMetadataOutput on macOS I'm not able to read out the ID3 tags. When I use the same code to read out a sample stream containing ID3 tags I do see them popping up. What am I doing wrong ?

  


  Reproduction :

  


  Streaming

  


  I generate an infinite HLS stream from a 5 minute long mpeg ts file using this command :

  


  ffmpeg -stream_loop -1 -re -i 5m.ts -c:v copy -c:a copy -f mpegts -strict -2 - | mediastreamsegmenter -b http://DamiaanTheoPro14.local:8081/ -f /tmp/hlsId3/video -D -m -M 50000 -log /tmp/hlsId3/log.txt


  


  I serve that HLS stream using nodejs builtin http-server

  


  ID3 tag generation

  


  Then I emit some ID3 tags using the following commands :

  


  id3taggenerator -title foo -artist bar -a localhost:50000
id3taggenerator -text "foo bar" -d "sample text" -r -a localhost:50000


  


  Reading

  


  Now to read out the tags I use this little SwiftUI app :

  


  import SwiftUI
import AVKit

let bipbopUrl = URL(string: "https://devstreaming-cdn.apple.com/videos/streaming/examples/bipbop_16x9/bipbop_16x9_variant.m3u8")!
let localUrl = URL(string: "http://damiaantheopro14.local:8081/prog_index.m3u8")!
let local = AVPlayerItem(url: localUrl)
let bipbop = AVPlayerItem(url: bipbopUrl)

struct ContentView: View {
    let player = AVPlayer()
    let observer = Id3Observer()
    var lastTag: AVMetadataGroup?
    
    var body: some View {
        VStack {
            HStack {
                Button("BipBop") {
                    player.replaceCurrentItem(with: bipbop)
                    bipbop.add(observer.metadataOutput)
                }
                Button("Local") {
                    player.replaceCurrentItem(with: local)
                    local.add(observer.metadataOutput)
                }
                Button("🅧") {
                    player.replaceCurrentItem(with: nil)
                }
            }
            VideoPlayer(player: player)
        }
        .padding()
    }
}

class Id3Observer: NSObject, AVPlayerItemMetadataOutputPushDelegate {
    let metadataOutput = AVPlayerItemMetadataOutput()
    
    override init() {
        super.init()
        metadataOutput.setDelegate(self, queue: .global())
    }
    
    func metadataOutput(_ output: AVPlayerItemMetadataOutput, didOutputTimedMetadataGroups groups: [AVTimedMetadataGroup], from: AVPlayerItemTrack?) {
        print("metadataOutput", groups.count)
        print("\t", groups.map { group in
            group.items.map { item in
                "\(item.dataType) \(item.keySpace!) \(item.key!) \(item.time.seconds) \(item.duration.seconds.rounded())"
            }.joined(separator: "/n/t")
        }.joined(separator: "\n\t"))
    }
}


  


• aarch64 : Factorize code for CPU feature detection on Apple platforms

  12 mars 2024, par Martin Storsjö

  aarch64 : Factorize code for CPU feature detection on Apple platforms
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavutil/aarch64/cpu.c

• sandboxed electron app cant use ffmpeg (mac apple store)

  3 janvier 2021, par Martin

  I am trying to build an electron application for the mac apple store that uses ffmpeg.

  


  I can use fluent-ffmpeg locally fine and It continues to work when I build my app for windows/mac/linux, but when I build a sandoxed Mac Apple Store (MAS) .app file and sign the .app file, fluent-ffmpeg does not work anymore, and throws an ffmpeg was killed with signal SIGILL error in console :

  


  

  


  Fluent-ffmpeg gets setup with this javscript code :

  


          //begin get ffmpeg info
        const ffmpeg = require('fluent-ffmpeg');
        //Get the paths to the packaged versions of the binaries we want to use
        var ffmpegPath = require('ffmpeg-static-electron').path;
        ffmpegPath = ffmpegPath.replace('app.asar', 'app.asar.unpacked')
        var ffprobePath = require('ffprobe-static-electron').path;
        ffprobePath = ffprobePath.replace('app.asar', 'app.asar.unpacked')
        //tell the ffmpeg package where it can find the needed binaries.
        
        ffmpeg.setFfmpegPath(ffmpegPath)//("./src/ffmpeg/ffmpeg");
        ffmpeg.setFfprobePath(ffprobePath)//("./src/ffmpeg/ffprobe");
        
        //end set ffmpeg info


  


  I have looked into this issue some and found similar questions, like this stackoverflow answer (link here) which says to compile a static ffmpeg executable and use that.

  


  So I learned how to compile ffmpeg from the command line using these commands on my mac terminal :

  


  git clone https://git.ffmpeg.org/ffmpeg.git 

./configure --pkg-config-flags="--static" --libdir=/usr/local/lib --extra-version=ntd_20150128 --disable-shared --enable-static --enable-gpl --enable-pthreads --enable-nonfree  --enable-libass --enable-libfdk-aac  --enable-libmp3lame  --enable-libx264 --enable-filters --enable-runtime-cpudetect

make



  


  After a while, I get an ffmpeg folder, which I move to my electron project's src folder /src/

  


  I place this ffmpeg folder inside my electron /src folder and change my ffmpeg setup code to use my statically built folder like so :

  


          //begin get ffmpeg info
        const ffmpeg = require('fluent-ffmpeg');
        //Get the paths to the packaged versions of the binaries we want to use
        var ffmpegPath = require('ffmpeg-static-electron').path;
        ffmpegPath = ffmpegPath.replace('app.asar', 'app.asar.unpacked')
        var ffprobePath = require('ffprobe-static-electron').path;
        ffprobePath = ffprobePath.replace('app.asar', 'app.asar.unpacked')
        //tell the ffmpeg package where it can find the needed binaries.
        
        ffmpeg.setFfmpegPath(ffmpegPath)//("./src/ffmpeg/ffmpeg");
        ffmpeg.setFfprobePath(ffprobePath)//("./src/ffmpeg/ffprobe");
        
        //end set ffmpeg info


  


  And then build / sign my app with these commands :

  


  $ electron-builder build --mac

$ sudo codesign --deep --force --verbose --sign '##(my dev id)####' dist/mas/Digify-mac.app


  


  But the final built .app file has the same error when trying to launch ffmpeg :

  


  ffmpeg was killed with signal SIGILL


  


  I've been trying to solve this issue myself but with no luck, there have been some recent posts about this on the apple developer forums :
https://developer.apple.com/forums/thread/87849

  


  but most of the other guides online are outdated.

  


  Can anyone please help me get ffmpeg working in an sandboxed electron app for the Mac Apple Store ? Any help would be much appreciated