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SRT Input audio channels - Issue with SRT Input audio channels
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joao  
#1 Posted : Tuesday, August 11, 2020 12:11:57 PM(UTC)
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Hi.

I'm having trouble configuring the audio input and output of the SRT stream.

At input, I can't receive more than two audio channels, even though I'm sure I'm sending 8 channels of audio.

At the output of the SRT stream, I cannot send the 8 audio channels, even if the master and bus outputs are configured to perform this function.
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Peter1000  
#2 Posted : Wednesday, August 12, 2020 4:56:18 PM(UTC)
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Hi Jao

Look at our description of it here.

Settings to transmitt 8-channel Sound via SRT
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LeahGreen  
#3 Posted : Saturday, August 15, 2020 12:49:50 PM(UTC)
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I actually just came here for the same reason. I cannot receive 4 channels of audio via SRT. Only 2 channels are showing up. I have tried encoding 2 steams of 2.0 and 1 stream of 4.0. Either way, VMIX only shows 2 channels.The remote end is a unix like system encoding with ffmpeg. The SRT connection works great and the first 2 channels of audio also work without any issue.

Thanks for any input.
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Peter1000  
#4 Posted : Saturday, August 15, 2020 4:17:31 PM(UTC)
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@LeahGreen
This is too little information about your system.
Are you sending from vMix? Did you follow the instructions of my previous post? Maybe you could post screen shots of your SRT and audio settings?

I can easily send and receive 8channel Audio from one vMix system to another vMix system.
if you see in your SRT input 8 channels,(audio settings from the input, channel mixer) then your remote sender is ok, and you have to set the right settings for the output on your side. if you see only 2, then your sender is doing something wrong.
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LeahGreen  
#5 Posted : Sunday, August 16, 2020 4:41:29 AM(UTC)
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Encoding is via FFMPEG.

When I decode the stream with ffplay it has 4 channels of discrete audio:

I can't find any information on the best way to encode more than 2 channels for a vmix SRT decode.... I read the link above, but it's all about encoding on a vmix. SO, I setup my encode to match the VMIX encode as close as possible...

FFMPEG ENCODE:
Quote:

Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: hevc (Main) (HEVC / 0x43564548), yuv420p(tv, smpte170m/unknown/unknown), 1280x720, 59.94 fps, 59.94 tbr, 90k tbn, 90k tbc
Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, 4.0, fltp, 218 kb/s



VMIX 4 CHANNEL ENCODE
Quote:
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, 4.0, fltp, 7 kb/s
Stream #0:1[0x101]: Video: hevc (Main) ([36][0][0][0] / 0x0024), yuv420p(tv), 1280x720 [SAR 1:1 DAR 16:9], 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc



Only difference is they switch the order of video/audio in the stream and the bit rate is a lot higher on my ffmpeg encode vs default settings for a 4M HEVC encode on VMIX...
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LeahGreen  
#6 Posted : Wednesday, August 19, 2020 3:55:35 AM(UTC)
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Also, just to follow up on this. I tried this VMIX <> VMIX and am running into the same issue. VMIX 1 > VMIX 2 decodes 4 channels ok, however, exact same settings VMIX 2 > VMIX 1 does not decode 4 channels. I have been scouring to find why this might be. They are identical machines, same hardware, software, even the same original disk image.

Thanks.
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Streamlab  
#7 Posted : Wednesday, August 19, 2020 9:57:11 PM(UTC)
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I just got to work to send 6 audiochannels from vmix to wowza and back to vmix. at wowza i want to split these audiochannels in 6 separate mpeg-ts streams. Therefore i need the mpegts Audio PID of each channel. I wonder if there is a single PID for each audio track or if there is only one. Media info shows me only one PID for all 6 audio tracks: PID= 0x101 or PID=257.

Does anybody know if vMix genarates only one PID for all audio tracks?
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LeahGreen  
#8 Posted : Tuesday, August 25, 2020 2:20:04 PM(UTC)
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All the tracks are in the same stream. Its not like OBS where you can encode multiple 2 channel audio streams into one SRT/TS output.

I ran out of time, and created a work around to my problem. I will be revisiting it again soon though. Thanks!
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pba  
#9 Posted : Saturday, October 24, 2020 3:34:14 AM(UTC)
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Hello,

I'm just curious, what was your workaround? I have near the seam problem!

Thanks, Peter
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m-garanin  
#10 Posted : Tuesday, April 13, 2021 7:50:55 PM(UTC)
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Originally Posted by: pba Go to Quoted Post
Hello,

I'm just curious, what was your workaround? I have near the seam problem!

Thanks, Peter


as option you can use SRT MiniServer , it supports multi-channel audio input and NDI output.
So workflow is Encoder---srt--->SRTMiniServer ---ndi--->vMix
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