Recorded files get choppy playback

Wowza Streaming Engine
1

Hello everyone, I’ve just installed the newest version 4.8.26+4 and tried to restream and record my IP cam stream (RTSP H265 / AAC). There is no sound in the HLS playback with VLC, codec info as below

2023-12-16_205029
2023-12-16_205029625×521 91.3 KB

The recorded file playback has sound but in very choppy quality. No rewind or forward play, just like a corrupted file

2023-12-16_211113
2023-12-16_2111131286×708 53 KB

There is no hint in the logs except these lines

2023-12-16      20:40:16        ICT     comment server  INFO    200     -       [live/_definst_/cam6.stream] LiveStreamRecorderMP4.stopRecording() filename=/usr/local/WowzaStreamingEngine/content/cam6.stream_2023-12-16-20.38.02.244-ICT_0.mp4       -       -       -       767.113 -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -       -
2023-12-16      20:40:16        ICT     comment server  WARN    200     -       QTWriterUtils.writeMOOVAtom[/usr/local/WowzaStreamingEngine/content/cam6.stream_2023-12-16-20.38.02.244-ICT_0.mp4]: File duration requires 64-bit atom structures. File may not play properly in QuickTime for Windows. -       -       -       767.121 -

What’s the problem here?

2

I forgot to mention I’m using Hikvision cameras after reading this post. Is there any specific problem with their codec and Wowza?

http://community.wowza.com/t/hikvision-cameras-and-wowza/43990/6

3

It’s weird that ffmpeg bring me better files, no choppy, able to rewind

Here is the ffprobe outputs of my 2 record files

Wowza Record

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'content/cam6.stream_1.mp4':
  Metadata:
    major_brand     : f4v
    minor_version   : 0
    compatible_brands: isommp42m4v
    creation_time   : 2023-12-17T13:31:57.000000Z
  Duration: 11:38:20.62, start: 0.000000, bitrate: 2 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1920x1080, 823 kb/s, 13.08 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2023-12-17T13:31:57.000000Z
      handler_name    : WowzaStreamingEngine
      encoder         : WowzaStreamingEngine
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 25 kb/s (default)
    Metadata:
      creation_time   : 2023-12-17T13:31:57.000000Z
      handler_name    : WowzaStreamingEngine

FFMPEG record

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'content/cam6.ff.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : HIK Media Server V4.72.109
    encoder         : Lavf57.83.100
    comment         : HIK Media Server Session Description : standard
  Duration: 00:01:13.41, start: 0.000000, bitrate: 1981 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920x1080, 1916 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 76 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

It seems like Wowza did not record at the correct framerate (25fps) and got data loss

4

Finally, I found these error logs about RTP/AVSyncMethod

WARN    server  comment 2023-12-17      19:38:04        -       -       -       -       -       426.976 -       -       -       -       -       -       -       -       RTPDePacketizerBase.Waiting for RTCP packet. See docs for (Application.xml: RTP/AVSyncMethod and RTP/MaxRTCPWaitTime).
WARN    server  comment 2023-12-17      19:38:08        -       -       -       -       -       430.776 -       -       -       -       -       -       -       -       RTCPHandler.isTimeSyncReady: Hit MaxRTCPWaitTime synchronizing on system clock.

and following exlaination in this thread, i changed the RTP/AVSyncMethod property to the systemclock and the AV streams seem to be synced correctly and I was able to view the stream.

http://community.wowza.com/t/impact-of-using-rtp-avsyncmethod-systemclock-versus-senderreport/37126/3

Thank you, community.