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Thread: No Closed Captions on *.f4m live stream, but Closed Captions present on *.m3u8

  1. #1
    Join Date
    Aug 2015

    Default No Closed Captions on *.f4m live stream, but Closed Captions present on *.m3u8

    I am using a Teradeck Slice to encode a live feed (via SDI input) and send an RTMP stream to my wowza setup running on AWS. I have an standard application setup to receive the RTMP stream and am generating multi-bitrate HDS and HLS streams. I am able to view both the HDS and HLS live streams in the test players that come with wowza 4.2 install, and I am able to see Closed Captions in the Apple HLS test player, but the Adobe HDS player does not show a captions display option. I am able to view the .m3u8 live stream in quicktime with captions, in VLC with captions, and on iOS devices all with Closed Captions. But when I try to play the .f4m live stream in my flowplayer (which is setup to display closed captions and does with other streams) I do not see any closed captions.

    According to teradek's website: "CC type supported: EIA-608 and EIA-708
    Insertion method: inserting into H.264 SEI, as per SCTE 128-1"

    Is Wowza capable of working with captions inserted into an RTMP stream using this method? Why am I am to see captions int the .m3u8 but not the .f4m stream?

    I feel like I am missing something simple here but have been over the information found here: but still have not been able to get captions to appear in the .f4m stream.

    Any insight/direction.assistance into this would be greatly appreciated. Thank you.

  2. #2
    Join Date
    Jun 2011


    Wowza Streaming Engine can take the live captions provide in EIA-608 form and convert those to onTextData. onTextData captions will play in supporting RTMP and HDS players.
    The Wowza test players themselves do not support these captions.

    You will need a player, such as FlowPlayer, in order to show the captions with HDS playback.

    Last edited by daren_j; 09-15-2015 at 12:39 AM.

  3. #3
    Join Date
    Aug 2015



    Thank you for your reply; I was able to figure out what I was missing.

    Unfortunately I was never good at recognizing when to step away from a problem and come back with fresh look. So after 7 hours of banging my head against this issue I drop the post above in hopes someone might have had similar issues, or may even be able to point out what I was missing.

    Then this morning I took one more look at and saw that I need to add the module to the application.

    Simple as that. I have no idea how or why I missed that the first dozen or so times I looked at that page, but there it was. I added the module, restarted the application and Closed Captions appears like magic in both the .f4m and .m3u8 versions of the live stream.

    Thank you,

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