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Thread: Transcoder audio problem

  1. #1
    Join Date
    Aug 2011
    Posts
    4

    Default Transcoder audio problem

    Hi,
    I have problem with pcm_mulaw->aac transcoding. I use two IP camers(MDC i4240 and AXIS P1347) as source. Transcoded stream from AXIS P1347 plays ok. But transcoded stream from MDC i4240 have problems with audio. Audio pulsates like helicopter. Original stream plays ok from both camers.

    When I publish MDC i4240 I get next message:
    CupertinoPacketHandler.handlePacket[rtp-live/_definst_/rtsp://root:root@192.230.1.35:554/cam0_0_720p]: Timecode out of order [audio]: 0:1354164967701

    I set debugAACTimecodes property and got next output:

    (MDC i4240)
    tc[2]: 1354173176479:1354173176477:8000
    reset: 10833385411816
    WARN server comment - CupertinoPacketHandler.handlePacket[rtp-live/_definst_/rtsp://root:root@192.230.1.35:554/cam0_0_720p]: Timecode out of order [audio]: 0:1354173176477
    tc[0]: 1354173176605:1354173176605:8000
    tc[0]: 1354173176733:1354173176733:8000
    tc[0]: 1354173176861:1354173176861:8000
    tc[6]: 1354173176989:1354173176995:8000
    reset: 10833385415960
    tc[9]: 1354173177123:1354173177132:8000
    reset: 10833385417056
    tc[15]: 1354173177260:1354173177245:8000
    reset: 10833385417960
    tc[3]: 1354173177373:1354173177376:8000
    reset: 10833385419008
    tc[3]: 1354173177504:1354173177501:8000
    reset: 10833385420008
    tc[0]: 1354173177629:1354173177629:8000
    tc[0]: 1354173177757:1354173177757:8000
    (AXIS P1347)
    tc[16]: 1354173280183:1354173280167:8000
    reset: 10833386241336
    tc[16]: 1354173280295:1354173280311:8000
    reset: 10833386242488
    tc[0]: 1354173280439:1354173280439:8000
    tc[0]: 1354173280567:1354173280567:8000
    tc[0]: 1354173280695:1354173280695:8000
    tc[0]: 1354173280823:1354173280823:8000
    tc[16]: 1354173280951:1354173280935:8000
    reset: 10833386247480
    tc[8]: 1354173281063:1354173281071:8000
    reset: 10833386248568
    INFO server comment - firstPacket: TCP:$3
    tc[8]: 1354173281199:1354173281207:8000
    reset: 10833386249656
    tc[0]: 1354173281335:1354173281335:8000
    tc[0]: 1354173281463:1354173281463:8000
    tc[8]: 1354173281591:1354173281583:8000

    ffprobe for AXIS P1347
    Stream #0:0: Video: h264 (Baseline), yuvj420p, 1920x1080 [SAR 1:1 DAR 16:9], 30 tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s

    ffprobe for MDC i4240
    Stream #0:0: Video: h264 (High), yuv420p, 640x480, 15 tbr, 90k tbn, 180k tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s

    Can we adjust audio stream to get zero or one timecode differences?
    Last edited by i101111; 11-29-2012 at 12:55 AM.

  2. #2
    Join Date
    Dec 2007
    Posts
    21,962

    Default

    Did you open a ticket for this already? If not, email support@wowza.com with this info. Include a link to the camera. And include a link to this thread for reference

    Richard

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