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Thread: empty captions when loading SMIL from S3

  1. #1
    Join Date
    Dec 2015

    Default empty captions when loading SMIL from S3

    I'm having trouble getting webvtt captions to work when streaming HLS from a vods3cf application.

    My SMIL file looks like this:

      <head />
          <video src="mp4:video-hd.mp4" system-bitrate="3206200" width="1280" height="544" title="HD" />
          <video src="mp4:video-sd.mp4" system-bitrate="736160" width="640" height="272" title="SD" />
          <textstream src="" system-language="eng">
            <param name="isWowzaCaptionStream" value="true" />
    I've configured the TimedText section of my conf/vods3cf/Application.xml as follows:

                            <!-- VOD caption providers (separate with commas): vodcaptionprovidermp4_3gpp, vodcaptionproviderttml, vodcaptionproviderwebvtt,  vodcaptionprovidersrt, vodcaptionproviderscc -->
                            <VODTimedTextProviders>vodcaptionprovidermp4_3gpp, vodcaptionproviderttml, vodcaptionproviderwebvtt,  vodcaptionprovidersrt, vodcaptionproviderscc</VODTimedTextProviders>
                            <!-- Properties for TimedText -->

    The video plays using HTML5 Video tag on OSX/Safari, and the caption button appears with "English" as an option, but the captions themselves do not appear in the video. The only errors I see in the access and error logs have to do with failure to load srt files associated with the video files, not the srt file called out in the SMIL:

    MediaCacheItemBase.init: Item does not exist: amazons3/myassetsbucket/files/8f45781ef8f740e4b1f58fae01e1b30b/

    Is it possible to load caption files this way when using HLS over the vods3cf application?

  2. #2


    Hello there and welcome to the wowza support forum.

    I think the quickest way to troubleshoot this is, if you have not done so already, to open a ticket with support.

    Please zip a copy of your /conf and /logs folders and send them to to raise a ticket.



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