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Thread: Playback issue with Mezzmo transcoding

  1. #1
    Join Date
    Sep 2011
    Posts
    17

    Default Playback issue with Mezzmo transcoding

    Hi all,

    I tried searching and found several references to what might be similar issues but no solutions. So here goes...

    On a lark, I bought a Logitech Revue... the price was right. Since its media player uses streaming vs. file sharing and does not support my Canon HF100 MKV (h.264) files, I have been trying various DLNA servers to see what works. They all have their various issues but Mezzmo comes the closest. In fact, it works great except for one annoying issue. Playing any transcoded file on the Revue for the first time results in no movement of the progress bar in the player and the video stops abruptly after 2-10 seconds (kinda random). If I play the file a second time, it plays perfectly.... the progress bar moves and it plays to the end just fine.

    I cannot be sure but I don't think this is strictly a player issue because it plays supported files perfectly with transcoding disabled.

    Server machine is Windows 7 x64, plenty of HD space, 3GHz dual core and 4GB RAM. Connection to the Logitech is 1GB hardwired. CPU usage during transcoding is low.... less than 50% and sometimes below 30%. In fact, is that maybe suspiciously low? Simply playing an h.264 file on that machine without hardware acceleration uses more CPU. The video card is an nVidia GT210 with Cuda acceleration.... does Mezzmo use hardware acceleration?

    Since subsequent plays are perfect, is this maybe an issue with on the fly transcoding serving up the file before it has transcoded enough? Just a thought.

    Yes, a workaround would be to play all files at least once. However, I have a LOT of them and insufficient storage space to transcode them all up front.

    Hope I can get it solved before the trial expires..... it works great aside from this, and I have no problem purchasing it.

    Any ideas? Anyone else using MKV files successfully with the Revue?

    Paul

  2. #2
    Join Date
    Nov 2007
    Location
    Melbourne, Australia
    Posts
    11,646

    Default

    Hi Paul,

    Unfortunately it's a limitation of their player at the moment - since a file that needs to be transcoded doesn't have a known size, their player rejects it. We've tried various workarounds that work for other devices, but couldn't find one that works. Considering their DLNA is still in beta state, we're hoping that Logitech will improve this in their firmware over time.

    Mezzmo uses FFmpeg for transcoding and that doesn't use hardware acceleration (at least not yet, but we're investigating this as well).

    Mezzmo Android: Install it on your tablet, smartphone, Android TV or Amazon Fire to browse and stream files from your Mezzmo library to all your devices. Full details at http://www.conceiva.com/products/mez...mo_android.asp
    Mezzmo for Kodi Add-on: Install it into Kodi to stream files from your Mezzmo library directly in Kodi. Full details at http://www.mezzmo.com/wiki/doku.php?...odi_user_guide
    Mezzmo for Roku App: Install it onto your Roku to stream files from your Mezzmo library. Full details at http://www.mezzmo.com/wiki/doku.php?...oku_user_guide
    Wiki: User Guides & Reference Manual at http://www.mezzmo.com/wiki
    Facebook: http://www.facebook.com/Mezzmo.DLNA.Server
    Twitter: https://twitter.com/conceiva_mezzmo
    Web: http://www.mezzmo.com

  3. #3
    Join Date
    Sep 2011
    Posts
    17

    Default

    Well DAMN! Yeah, that makes perfect sense.

    Would it be possible for the transcoding engine to guestimate the final transcoded file size up front, add a bit for safety, and then pad the end as needed? Or guestimate the final file size up front and then dynamically adjust the compression to make the final file match the guestimate?

    Just thinking..... the Revue works pretty well aside from that. And the fact that it doesn't have much content at present But as a network aware wired or wireless player it isn't bad.

    Paul

  4. #4
    Join Date
    Nov 2007
    Location
    Melbourne, Australia
    Posts
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    Default

    Some of our workarounds do try to guess the final size and of course it's impossible to match a guesstimate perfectly, since we're talking about variable rate video and audio. If the file is off even by one byte, some devices will reject it. I don't think it's technically possible to match the file size precisely, unless the encoded format is uncompressed video and uncompressed audio (which isn't playable by anything, really).

    Mezzmo Android: Install it on your tablet, smartphone, Android TV or Amazon Fire to browse and stream files from your Mezzmo library to all your devices. Full details at http://www.conceiva.com/products/mez...mo_android.asp
    Mezzmo for Kodi Add-on: Install it into Kodi to stream files from your Mezzmo library directly in Kodi. Full details at http://www.mezzmo.com/wiki/doku.php?...odi_user_guide
    Mezzmo for Roku App: Install it onto your Roku to stream files from your Mezzmo library. Full details at http://www.mezzmo.com/wiki/doku.php?...oku_user_guide
    Wiki: User Guides & Reference Manual at http://www.mezzmo.com/wiki
    Facebook: http://www.facebook.com/Mezzmo.DLNA.Server
    Twitter: https://twitter.com/conceiva_mezzmo
    Web: http://www.mezzmo.com

  5. #5
    Join Date
    Sep 2011
    Posts
    17

    Default

    Here's another thought.... per what I have read, the Revue supposedly supports h.264, just (apparently) not my MKV container. Any chance of "transcoding" to another supported container without trying to decompress/recompress? That might be fast enough to finish the file before serving it to the player without adding a significant delay?

    Please help.... I'm trying to justify keeping the Revue I love the keyboard and the Tivo integration, but if it won't play my files AND won't play the major TV web sites.......

    Paul

  6. #6
    Join Date
    Nov 2007
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    Melbourne, Australia
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    We will try to remux as much as possible (change the video container, keeping the video stream), but that still takes time and we're limited by the few seconds a device will wait for us to start delivering a file (usually under 25 seconds). Even if you have an i7, I doubt you can remux a full-length movie within the 20-25 second time slot. The best results I have on my i7 here are around 2-3 minutes.

    Mezzmo Android: Install it on your tablet, smartphone, Android TV or Amazon Fire to browse and stream files from your Mezzmo library to all your devices. Full details at http://www.conceiva.com/products/mez...mo_android.asp
    Mezzmo for Kodi Add-on: Install it into Kodi to stream files from your Mezzmo library directly in Kodi. Full details at http://www.mezzmo.com/wiki/doku.php?...odi_user_guide
    Mezzmo for Roku App: Install it onto your Roku to stream files from your Mezzmo library. Full details at http://www.mezzmo.com/wiki/doku.php?...oku_user_guide
    Wiki: User Guides & Reference Manual at http://www.mezzmo.com/wiki
    Facebook: http://www.facebook.com/Mezzmo.DLNA.Server
    Twitter: https://twitter.com/conceiva_mezzmo
    Web: http://www.mezzmo.com

  7. #7
    Join Date
    Sep 2011
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    17

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    But but but..... in my case, my files are between 10 seconds and 10 minutes long. They are camera original files from my Canon HF100. All my longer files are AVI. Any chance I can get it to remux my MKV files and accept the fact that it will introduce a delay and longer files may not play (I think the Revue waits about 10 seconds)? That would be a very acceptable solution for me.

    Paul

  8. #8
    Join Date
    Nov 2007
    Location
    Melbourne, Australia
    Posts
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    Default

    Well, we could try If you are comfortable editing the device profiles (they are just text files), I can tell you what to change, or open up a support ticket (mention this thread) and I'll create a test device profile for you.

    Mezzmo Android: Install it on your tablet, smartphone, Android TV or Amazon Fire to browse and stream files from your Mezzmo library to all your devices. Full details at http://www.conceiva.com/products/mez...mo_android.asp
    Mezzmo for Kodi Add-on: Install it into Kodi to stream files from your Mezzmo library directly in Kodi. Full details at http://www.mezzmo.com/wiki/doku.php?...odi_user_guide
    Mezzmo for Roku App: Install it onto your Roku to stream files from your Mezzmo library. Full details at http://www.mezzmo.com/wiki/doku.php?...oku_user_guide
    Wiki: User Guides & Reference Manual at http://www.mezzmo.com/wiki
    Facebook: http://www.facebook.com/Mezzmo.DLNA.Server
    Twitter: https://twitter.com/conceiva_mezzmo
    Web: http://www.mezzmo.com

  9. #9
    Join Date
    Sep 2011
    Posts
    17

    Default

    I'm quite comfortable with editing the profile as long as I can find it How about we do it here so others with the same issue can try it?

    Unfortunately, I don't know what h.264 containers are supported. That said, I'm pretty sure my Sony AVS files (*.mp4, rendered from Vegas) play just fine without transcoding.

    Paul

  10. #10
    Join Date
    Sep 2011
    Posts
    17

    Default

    Just had a look to get a head start and I don't see anything that looks like a profile file. I looked in the program file folder as well as app data (local, low and roaming).

    Paul

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