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Thread: Live Stream Recording Audio and Video Sync Issue

  1. #21

    Unhappy

    Tried debuggAAC and MP3 , result shows following so it looks like its not going above 1 . However recorded file is still out of sync . We also upgraded to wowza 4.2 and still its same issue .

    tc[0]: 1894821796:1894821796:44100
    tc[0]: 1894821819:1894821819:44100
    tc[0]: 1894821819:1894821819:44100
    tc[0]: 1894821842:1894821842:44100
    tc[0]: 1894821866:1894821866:44100

  2. #22
    Join Date
    Mar 2016
    Posts
    7

    Default

    I'm having the exact same problem described by sdabhi. Live stream is perfect, while recorded MP4 has A/V sync issues.

  3. #23
    Join Date
    Jan 2015
    Posts
    357

    Default

    Hi,

    @sdabhi: There was a fix in the recent Wowza versions that fixed this issue. Do make sure that your Wowza server is updated to the latest version available and test again. Do make sure that you have rollback procedures in place and that you test thoroughly.

    @noface0711: what Wowza version are you using?

    Michelle

  4. #24

    Default

    Hi Michelle, I am also experiencing similar A/V sync issues with mp4 recording.

    We've been researching using Wowza as a recording alternative to our sometimes unreliable CDN live recording. After some initial testing we are discovering cases when Wowza is out of sync but the CDN recording is in A/V sync! Any insights to why Wowza recording unsyncs?

    Our Wowza version is 4.4.0 (build 17748).

  5. #25

    Default

    Hello,

    Are you playing the recorded file through Wowza as a VOD asset or as a progressive download mp4? The recordings done with Wowza Streaming Engine do not support direct playback via progressive download.

    Regards,
    Andrew

  6. #26

    Default

    Andrew,

    We are downloading recordings and we encode them for VOD delivery on a variety of different players, JWPlayer for example. Just to be clear, I am taking about the recorded files before we send them to encoding.

    I have discovered a difference between the Wowza and CDN recordings. On both recordings or video stream is shorter duration than the audio stream. However, the Wowza MP4 recorded stream does not have the correct stream "start_time" value to align the A/V streams.

    In fact, ALL of our Wowza recordings have a video start_time parameter of "0.06600" regardless of the A/V stream durations. Is this a bug or is it normal behavior for the recording feature?

    Some info on our recording parameters:

    * Version existing file
    * Record Data
    * Start on Keyframe
    * Segmentation Option: none

  7. #27

    Default

    Hello,

    When Wowza Streaming Engine records files it places a moov atom at the end of the recording. Since it's created from a live stream, the end time has not been determined until the recording stops. This is fine when the files are played back as a VOD asset from Wowza Streaming Engine but could be the reason why your downloaded and post-Wowza encoded files are showing incorrect time information. For some types of playback such as progressive download, the moov atom should be placed at the beginning of the recording. This can be done external to Wowza using a program such as ffmpeg, with the -movflags faststart switch, which will re-position the moov atom to the beginning of the file and hopefully resolve this issue.

    Best regards,
    Andrew

  8. #28

    Default

    Has there been a solution yet? I am facing the same issue with live-record type of application.

  9. #29

    Default

    Hi pcurley,

    Please open a new support ticket referencing this forum post. Our Engineering Team has identified an issue with some live-record recordings being out of lip sync and has a fix available that will be included with our next update. We would like to see if your situation matches this current known scenario or is a different problem.

    If you could include a zipped copy of your conf/ and logs/ directories with this ticket, that will help us determine if this is a relevant fix.

    Best regards,
    Andrew

  10. #30
    Join Date
    Oct 2011
    Posts
    3

    Default

    Can you give a bit more info on the known issue?
    Is it specific to certain types of live encoders, codecs, profiles?


    Quote Originally Posted by andrew_r View Post
    Hi pcurley,

    Please open a new support ticket referencing this forum post. Our Engineering Team has identified an issue with some live-record recordings being out of lip sync and has a fix available that will be included with our next update. We would like to see if your situation matches this current known scenario or is a different problem.

    If you could include a zipped copy of your conf/ and logs/ directories with this ticket, that will help us determine if this is a relevant fix.

    Best regards,
    Andrew

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