SMIL for VOD with caption

Wowza Streaming Engine
1

this is my simple smil file:

<?xml version="1.0" encoding="UTF-8"?>
<smil title="vod-slim">
   <body>
    <switch>

        <video src="7/assets/products/Movie/1508076480_MXzoGWG94b_160p.mp4" system-bitrate="357200"></video>

        <video src="7/assets/products/Movie/1508076480_MXzoGWG94b_360p.mp4" system-bitrate="662000"></video>

        <textstream src="sub_titles/1508076480_6M53grmeGY.vtt" system-language="ger">
             <param name="isWowzaCaptionStream" value="true" />
        </textstream>

        <textstream src="sub_titles/1508055070_bkqMuEnUxR.vtt" system-language="eng">
             <param name="isWowzaCaptionStream" value="true" />
        </textstream>

    </switch>
   </body>
</smil>

i use HLS.

my problem is:

1- i could not get language title in any player, it just show unknown subtitle in cc buttons

2- it only serves the first subtitle, i don’t get two subtitles

3- it only serves vtt and ttml files, if i add srt files if wont work (srt is enabled in setup)

also i have a question related to subtitle:

4- i embed subtitles to video by ffmpeg. but i cant show subtitles in players streamed by wowza, is this possible by wowza to serve subtitles embed in files?

regards.

2

there is no answer for this question? anybody?!

3

SMIL files are unique to each protocol. Note that subtitles are not supported with MPEG-DASH.

Please take a look at the following article for how to deliver multiple sidecar subtitle files via HTML5.

https://www.wowza.com/docs/how-to-to-serve-caption-files-for-video-on-demand-streaming

SMIL files support only one textstream value. Your SMIL file is using two.

https://www.wowza.com/docs/how-to-stream-webvtt-subtitles-to-ios-for-closed-captioning

From the article.

To play using a SMIL file

To play adaptive bitrate (ABR) streams using a SMIL file, the caption info must be added to the SMIL file using a single textstream tag (SMIL files don’t support multiple textstream tags).

If you use a SMIL file for ABR content delivery and provide more than one subtitle language track then you must use a multi-language caption file. This would be a TTML file that combines all necessary languages into one file.

We have an article on how to switch between different subtitles. I have hot linked to the format of the TTML file.

https://www.wowza.com/docs/How-to-configure-closed-captioning-language-selection-for-video-on-demand-streaming#multiLanguage