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• Is there any open source HLS segmenter that supports Apple Low Latency HLS ? [closed]

  13 juillet 2021, par Marcus Wichelmann

  Currently I'm using FFmpeg to produce a HLS segmented stream to deliver some live content to our users. Now I'd like to reduce latency by using Apples latest Low Latency Standard which is unfortunately quite complex and the only standard that is supported on Apple devices.

  


  But I have not yet found any open source implementation of this. Do you know of any project that works on implementing the whole Apple LL-HLS standard including the latest #EXT-X-PRELOAD-HINT additions ?

  


  What do you use as segmenter for your low latency ABR streams ?

  


• Alternative to ffmpeg for iOS

  6 mai 2012, par resident_

  I've been trying to implement ffmpeg in my ios app several weeks. And now I can play several avi files, but other files like a flv, wma, mp4... play slow.

  I have spent much time with ffmpeg and opengl and I don't find solution.

  I'm looking other alternatives to play this files on ios device.

  Someone know other libraries, frameworks, ... that I can use to play this files. No matter if they have business licenses.

  Very thanks,

  Edited :

  Init Shader :

   shader = [[GLShader alloc] initWithFileName:@"render" attributes:[NSDictionary dictionaryWithObjectsAndKeys:
  
                                                                                               [NSNumber numberWithInt:0], @"position",
  
                                                                                               [NSNumber numberWithInt:1], @"texCoords", nil]
  
                                           uniforms:[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:0], @"sampler0",
  
                                                                                               [NSNumber numberWithInt:0], @"viewProjectionMatrix",nil]];

  render.fsv :

  uniform sampler2D sampler0;
  
  varying highp vec2 _texcoord;
  
  void main()
  
  { gl_FragColor = texture2D(sampler0, _texcoord);}

  render.vsf :

  attribute vec4 position;
  
  attribute vec2 texCoords;
  
  varying  vec4 colorVarying;
  
  varying vec2 _texcoord;
  
  uniform mat4 viewProjectionMatrix;
  
  
  
  void main()
  
  {   _texcoord = texCoords;   
  
  gl_Position = viewProjectionMatrix * position;}

  How I can implement your solution in this code ?

• How does one go about undoing an avformat_seek_file call in libavcodec ?

  2 juillet 2020, par John Allard

  I have an application written around libavcodec that sometimes attempts to seek ahead in a video while performing some work. The call to avformat_seek_file can only seek to a keyframe, so sometimes I end up in a situation where it ends up seek backwards from my current position in the decoding routine causing me to have to repeat work. For example, if I'm on frame 150 and I want to seek to frame 200, but the only key frames in the file are on frames 1 and 100, this call will have me seek back to frame 100, meaning I now have to decode 100 frames to get to 200 instead o 50 frames to get to 200 from my original decoding position of frame 150.

  


  Is there a way for me to tell avformat_seek_file to undo its last seek and reset me to my previous location ? Is there some other way for me to "save" my decoding state to undo this wrongful seek manually ?

  


  edit - it should be noted that my videos are always h264 encoded in an mp4 container.