Can I change audio codec of RTSP stream from Nx server?
Answered
Hi.
Can I change audio codec of RTSP stream from Nx server?
I confirmed that audio codec of RTSP stream from Nx server is mp2, I want to change it to G.711 or AAC.
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Hi Makoto Ogata,
The codec for the audio, could be set in the devices' interface if this option is available.
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Hi Norman Graafsma.
Thank you for quick reply.
Audio codec of my IP camera is G.711, and RTSP streaming from IP camera has G.711 audio,
but when I get RTSP streaming of the IP camera from Nx server has mp2 audio.
I assume that Nx server converts audio stream.
Could you correct me if I'm wrong.
Thank you.
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Hi Makoto Ogata,
Nx takes the codec as it is offered and Nx doesn't change it.
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Hi Norman Graafsma.
Hmm... but I confirmed that the audio codec is different when I get the RTSP stream directly from the IP camera and when I get the RTSP stream through the Nx server as below.
In my point of view, audio stream is converted from mulaw to mp2 codec.
Could you re-confirm the audio codec related spec of Nx server?
RTSP from a IP camera
develop@pop-os:~$ ffprobe rtsp://admin:xxxx@192.168.0.10/ONVIF/MediaInput?profile=def_profile1
ffprobe version 4.4.1-3ubuntu5 Copyright (c) 2007-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-18ubuntu1)
...
Input #0, rtsp, from 'rtsp://admin:xxxx@192.168.0.10/ONVIF/MediaInput?profile=def_profile1':
Metadata:
title : Media Presentation
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: h264 (Baseline), yuv420p(tv, progressive), 1280x720, 30 fps, 30 tbr, 90k tbn, 60 tbc
Stream #0:1: Audio: pcm_mulaw, 8000 Hz, 1 channels, s16, 64 kb/s
RTSP from Nx serverdevelop@pop-os:~$ ffprobe rtsp://admin:xxxx@192.168.0.22:7001/219d661b-ec18-5b84-f8d7-07ac6fa357c7
ffprobe version 4.4.1-3ubuntu5 Copyright (c) 2007-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.2.0-18ubuntu1)
...
[rtsp @ 0x562409aa9e80] max delay reached. need to consume packet
[rtsp @ 0x562409aa9e80] RTP: missed 127 packets
Input #0, rtsp, from 'rtsp://admin:xxxx@192.168.0.22:7001/219d661b-ec18-5b84-f8d7-07ac6fa357c7':
Metadata:
title : Panasonic_WV-S3510
Duration: N/A, start: 0.200000, bitrate: N/A
Stream #0:0: Video: h264 (Baseline), yuv420p(tv, progressive), 1280x720, 30 fps, 30 tbr, 90k tbn, 60 tbc
Stream #0:1: Audio: mp2, 16000 Hz, mono, fltp, 64 kb/s -
FYI, let me share the info of the target IP camera as below.
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Thank you for the feedback Makoto Ogata.
The information I initially provided, was incorrect. My apologies.
I have verified this myself and internally. Unfortunately, due to a software limitation, the audio is indeed converted to mp2.
I'll create a request for our developers to offer an option to specify the audio codec when using the RTSP stream.
That being said, I don't expect that we can deliver such an option soon, if at all.
JIRA-VMS-33801
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Hi Makoto Ogata,
Covert or convert?
I assume the last; yes, currently Nx converts the audio stream to mp2.
As mentioned above, I have requested our developers to investigate if they can change this in a future release, so you can select the preferred codec.
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The issue was resolved by adding AAC as an option to use for an RTSP stream:
You can check all options in the API documentation / Media / RTSP streaming.
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