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Thread: No audio from TBS 2600 encoder

  1. #1
    Join Date
    Feb 2014

    Default No audio from TBS 2600 encoder

    Hi. I have a TBS Technologies TBS2600 HD-SDI encoder (see The video feed comes from a camera with a BNC output, and the audio through a stereo 1/8" connection from an audio mixer (Bose ESP-88). The connection from the Wowza Streaming Server (v. 4.4.1, build 17882 on Ubuntu) to the encoder is via RTSP to the main output from the encoder. The connection is successful, but there is no audio track in the output to the client. When I connect directly to the encoder via RTSP from VLC, it plays fine. In this case, the codec information in VLC is:

    Stream 0
    Type: Video
    Codec: H264 - MPEG-4 AVC (part 10) (h264)

    Stream 1
    Type: Audio
    Codec: MPEG AAC Audio (mp4a)
    Sample rate: 48000 Hz

    Stream 2
    Type: Video
    Codec: H264 - MPEG-4 AVC (part 10) (h264)
    Resolution: 1280x738
    Display Resolution: 1280x720
    Decoded format: Planar 4:2:0 YUV

    Stream 3
    Type: Audio
    Codec: MPEG AAC Audio (mp4a)
    Channels: Stereo
    Sample rate: 48000 Hz

    There is nothing in either the access or error logs concerning a lack of audio; there are, however, lost packets (usually 2 packets at a time). Currently, the camera is about 500 miles from the server, but I am in the process of setting up a new server on-site.

    The nDVR is enabled, and I have tried with the Transcoder both enabled (audio set to "Passthrough") and disabled.

    What can I check?

    Thank you.

  2. #2
    Join Date
    Apr 2010


    We use the same TBS encoder and use UDP to get the stream to Wowza. Works great Maybe try that?

  3. #3
    Join Date
    Sep 2016


    Hi mjoop1,

    You could try changing the RTSP property that is outlined here:

    It may resolve the issue.


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