Video issues on iOS (missing audio)

[urthling]

The following plays properly on iPhone X and Android

Video is OK but the audio is missing on: iPhone 5S, iPhone 7+, iPhone 8+ (no other iPhone tested)

Tested using AIr 27 through 30

Testing using ffmpeg encode settings:

mp4

libfdk_aac

128000

44100

libx264

1200000

1024x768

I also found a test stream that you can use to reproduce the issue described above: https://content.jwplatform.com/manifests/yp34SRmf.m3u8

Taken from here: https://developer.jwplayer.com/tools/stream-tester/?playerversion=7

There's also this taken from another bug related to video on this forum: https://s3.amazonaws.com/flaxbinpic/bunny.mp4

protected function test_triggeredHandler(event:Event):void
{
  vidClient = new Object();
  vidClient.onMetaData = onMetaData;
  nc = new NetConnection();
  nc.connect(null);
  ns = new NetStream(nc);
  ns.addEventListener(NetStatusEvent.NET_STATUS, onNetStatus);
  ns.client = vidClient;
  videoTexture=Texture.fromNetStream(ns , Starling.current.contentScaleFactor , onTextureComplete)
  ns.play("https://somevideo.mp4");
}
  private function onTextureComplete():void
  {
       videoImage = new Image(videoTexture)
       this.addChild(videoImage)
  }
  private function onMetaData():void
  {
       trace('on net onMetaData');
  }
  private function onNetStatus(event:NetStatusEvent):void
  {
       trace('on net status');
  }

https://tracker.adobe.com/#/view/AIR-4198668

[urthling]

I can't be the only one seeing this.. Can someone else please confirm you're seeing the same issue?

[tuarua]

Do you get audio if you open the video in the native video player on those phones?
Video and audio encoding is not as simple as just running through FFmpeg with any old settings.

You are using libfdk_aac for example which is a proprietary version of AAC.
I suggest you use Handbrake which has presets for targeting certain devices, or do an internet search for encoding settings for iOS

[urthling]

The setting was a preset called "ipad-high" (transloadit) - so i assumed this was an optimal setting for iOS. That and the fact that every other .mp4 I can find, fails to play - figured this had to be a bug.

So, in answer to your question, actually no, using a native player (distriq MediaPlayer) - the streams do not play. Ok, this is fantastic - so, just a codec change should fix this..

Ty for taking the time to respond, much appreciated. Perhaps we need to change solutions. Do you know of any transcoding solutions that work?

We're using these guys:
https://transloadit.com/docs/transcoding/#video-presets

Do you know what audio codec we should be using with FFMPEG?
https://transloadit.com/docs/transcoding/#audio-presets

It seems there are two AAC codecs available to ffmpeg - I've sent a request to see if I can use the other aac codec.

[urthling]

Ok, using libmp3lame worked for us. Not iPhone 5 - but I can live with that.