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Thread: Smooth Streaming problems - Wowza 3

  1. #1
    Join Date
    Oct 2011
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    2

    Post Smooth Streaming problems - Wowza 3

    Hi,

    I've just installed Wowza server 3 and have been abled to play the rtmp and smooth streaming examples, only the rtmp file plays in our flash player. Smooth files seems to start to play in our silverlight player but an error message is shown " Caught exception trying to parse main manifest"

    The errors in the access log if the smooth files are in a subdirectory of content are that the file cannot be find ie it's looking for the file one level up.

    However if I move the files one level up to the content directory the I get the following error: File is missing 'moov' atom.

    I'm pretty sure everything is configured properly. I've configured port 80 in the vhost.xml but still have a problem playing.

    Incidentally the url to the manifest file deplays a blank page instead of the ism contents.

    Hope you can help

    Thanks,

    Ann

  2. #2
    Join Date
    Dec 2007
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    Ann,

    When content is in subfolder, use "_defint_" to separate server/app part from the stream part (which includes the path). Like this:
    http://[wowza-address]:1935/vod/_definst_/mp4:subfolder/sample.mp4/Manifest
    Richard

  3. #3
    Join Date
    Oct 2011
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    2

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    Richard,

    Thanks, I've done as you suggested and this works fine for the sample file above. However it does not work for ism/ismv files. The error message is "File is missing 'moov' atom". How should the code look for smooth ism?

    Ann

  4. #4
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    Ann,

    Use mp4: prefix on the .ismv files, and smil: prefix on the .ism files

    mp4:video.ismv

    smil:videoList.ism

    or

    mp4:subfolder/video.ismv

    smil:subfolder/videoList.ism

    Richard

  5. #5

    Default

    Hi,

    If i 'feed' WMS with ismv files, do i have to change the smil file?, am i supposed to give Wowza the ism file instead?.

    Thanks in advance,

    Germán

  6. #6
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    Dec 2007
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    You can use the ISM file. Use smil: prefix

    http://[wowza-address]:1935/vod/smil:streams.ism/playlist.m3u8
    Richard

  7. #7

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    Richard:

    I've done what you said, and it works... however, i'm having some issues with smooth streaming (only with ISMV files), specifically with video frame rate (really low, e.g., 12-14 fps on a 25 fps video).
    Looking through the forum i found this link http://www.wowza.com/forums/showthre...ramerate-on-SS where the problem is described. I've got a couple of questions regarding this issue:

    1 - I still don't understand why the player experiences playback problems if it's WMS who can't 'deal' with fragmented B-frames. Could you explain it a little bit more?

    2 - Have you released any patch to solve this?

    Thanks in advance!,

    Germán

  8. #8
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    Dec 2007
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    Germán,

    It is better to avoid the Silverlight encoding presets in Expression that produce these files. They do work, but the ISMV are fragmented mp4 files which Wowza can handle but at cost of added overhead.

    If b-frames are turned on, trying turning that off.

    We use Expression 4 with settings like the ones in these suggested presets:

    http://www.wowza.com/forums/content....ideo-on-Demand

    You have to create a smil file, Expression 4 does not generate that like it does the ism files.

    Richard

  9. #9
    Join Date
    Jul 2014
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    12

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    Quote Originally Posted by rrlanham View Post
    Germán,

    It is better to avoid the Silverlight encoding presets in Expression that produce these files. They do work, but the ISMV are fragmented mp4 files which Wowza can handle but at cost of added overhead.

    If b-frames are turned on, trying turning that off.

    We use Expression 4 with settings like the ones in these suggested presets:

    http://www.wowza.com/forums/content....ideo-on-Demand

    You have to create a smil file, Expression 4 does not generate that like it does the ism files.

    Richard
    Can you please check if this feature will be included in future releases?
    B-frames should be supported mainly because of quality (H.264 Main)

    Regards,

    DM

  10. #10
    Join Date
    Jan 2015
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    323

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    Hi,

    Wowza Media Server does support b-frames. We suggest a single consecutive b-frame setup instead of the fragmented setup described in the previous post. We do encourage simple encoding parameters to support more playback clients. Here is a general guide on this:

    http://www.wowza.com/forums/content....demand-content

    Michelle

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