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Thread: Audio and Subtitles for smooth streaming on Silverlight

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  1. #1

    Default Audio and Subtitles for smooth streaming on Silverlight

    I am not able to stream audio and subtitles for an ism file on Silvelight.
    <audio src="7ece920d-7750-4831-bf78-77e75eb1cfa0_708.ismv" systemBitrate="96000">
    <param name="trackID" value="1" valuetype="data" />
    <param name="trackName" value="audio" valuetype="data" />
    <param name="timeScale" value="10000000" valuetype="data" />
    </audio>
    <textstream src="f4875122-261a-44df-a7f2-b12aeac23bd6.jpn.capt.dfxp.ismt" systemBitrate="687" systemLanguage="jpn">
    <param name="trackID" value="1" valuetype="data" />
    <param name="trackName" value="textstream0" valuetype="data" />
    <param name="timeScale" value="10000000" valuetype="data" />
    </textstream>
    Is there a way to solve this?

  2. #2
    Join Date
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    Is it audio only, no video? That doesn't work in Silverlight player. I'm not sure about the sub-titles but Wowza's recently added Closed Caption features do not include smooth streaming and Silverlight player

    Richard

  3. #3

    Default

    There is an ismv with video and audio, the streams mentioned above are additional audio (the audio stream has black frame encoded as video) and subtitles referred to as ismv and ismt respectively in the ism file. So the wowza server is not able to parse audio and textstream tags then? If so, can we add plug-in's so it can parse those tags as well?

  4. #4
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    I'm not sure what to suggest. I know Wowza does not support this at present. It is possible in the future but I don't know of any plans.

    Richard

  5. #5

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    Does wowza recognize the audio tag in the ism file?

  6. #6
    Join Date
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    I don't think so. I assume you are playing the ism file with the smil prefix. Wowza supports an audio only rendition for iOS, but not for Silverlight.

    If you have ismv files with multiple bitrate renditions encoded into one file (use Expression 4 Encoder), that is not supported in Wowza. You have to have separate files.

    Also note that the ismv files are fragmented, which Wowza can stream, but it is higher overhead especially at the start of playback. We recommend the encoding path using Expression 4 Encoder that is shown in this article:
    http://www.wowza.com/forums/content....demand-content

    Richard
    Last edited by rrlanham; 07-08-2013 at 06:03 AM.

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