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• AudioContext HTML5 Player

  15 février 2015, par Plyto

  So I’ve been playing with the Web Audio API and have the following issue.

  I am making a project in which I call an external library’s API with Ajax and get audio back (arraybuffer).

  • I send them the text and get audio back.
  • This is not necessarily a GET request (can be POST, etc.)
  • If text is too large, I split it into smaller chunks and send multiple requests

  So far so good, now comes the issue of how to play the multiple audios that I got back.

  Since users do not care that I have split the text and actually have multiple audio tracks, I need somehow to make it look like a single track or as a playlist.

  So I have tried to :

  • merge arraybuffer (apparently it does not work like that and most likely I need ffmpeg or simiar tools to do the merging, which is hard to do on client-side ? (like there is ffmpeg for browsers, but I don’t know how good is it to burden a client with it). If it’s not so, maybe you can suggest something here)
  • load it as a playlist, but so far cannot find a library that accepts multiple audiobuffers/audiocontexts and/or gives a playlist with it back.

  The easiest solution that I see so far is to create my own small library that accepts AudioBuffers/arraybuffers and go either with the playlist approach or play the ’chunked’ audios one by one and make scrubber that jumps between audio contexts.

  Is there a library/easier approach ?

  Will be thankful for any suggestions :]

• FFMPEG stream separate video and music files

  10 janvier 2018, par Kulcanhez

  I want to stream using FFMPEG some random nature videos and have some random music playing under it, by other words, playing some video files and some music files at the same time. I already searched but I found no solutions. I’m using Ubuntu currently. I said FFMPEG because I didn’t found any other solution. Thanks !!

• FFmpeg decode raw buffer with avcodec_decode_video2

  29 octobre 2014, par Martin Schlott

  I am receiving a h264 stream where I at least know the size of one frame. The stream is coming in right as I can store it in a file and playback with vlc. Playing back a file is no problem for me as I include the libavformat. But libavformat gives me back an AVPacket which I can directly give to avcodec_decode_video2. In this case I got a bytestream. How can I give the raw h264 stream to the avcodec_decode_video2 ? How can I wrap my data into a AVPacket. VLC does not need to guess any data.