Results 1 to 2 of 2

Thread: Encoding for HLS

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1

    Default Encoding for HLS

    We're using Adaptive HLS streaming for a VOD site and we're currently trying to optimize our encoding, testing different bit rates and frame sizes and so on. We're finding that once we drop the frame size down to a certain point, the segments/chunks become misaligned with the other encodes. For instance, in our current test almost all encodes chunk out perfectly at 3 seconds per chunk, but the chunk sizes bounce around for the encode with the smallest frame size. They aren't exactly 3 seconds like the other encodes. Is this normal? Will this cause the playback to break if/when the player switches to that file, or will it just cause the video to stutter a little?

    My colleague who is doing all the encoding is using Compressor. He's tried everything he can think of to get the chunk sizes to be exactly the same across all files, but once he lowers the frame size to a certain point, they just don't align. Any insight into why, and the consequences of having different chunk sizes, is appreciated.


  2. #2
    Join Date
    Dec 2007



    What controls chunk duration is key frame frequency of the encoding, and the cupertinoChunkDurationTarget setting in Wowza. The default cupertinoChunkDurationTarget is 10000ms (10 seconds). To make consistent 3 second duration chunks, make the key frame frequency either 1, 2 or 3 seconds, and set the cupertinoChunkDurationTarget to 3000ms (3 seconds).

    Key frame frequency is key frame interval (or gop) / FPS


Similar Threads

  1. Wowza HLS push to Akamai HLS config
    By ajsinclair in forum Live Streaming and Encoder Discussion
    Replies: 2
    Last Post: 09-27-2015, 05:30 AM
  2. I want to use hls streaming on windows phone 8 using hls sdk.Please help
    By srk2k14 in forum Wowza Streaming Engine functionality
    Replies: 1
    Last Post: 07-11-2014, 06:07 AM
  3. Access level of HLS encoding
    By Jan Cássio in forum Integrating Wowza into your workflow
    Replies: 2
    Last Post: 07-16-2013, 08:33 AM
  4. determine specific encoding for a multi-rate HLS session
    By ctb041 in forum Server-side Modules and Code Samples Discussion
    Replies: 5
    Last Post: 06-12-2013, 10:01 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts