logo

Live Production Software Forums

www.vmix.com

Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error
SRT Input audio channels - Issue with SRT Input audio channels
Options
Go to last post Go to first unread
Previous Topic Next Topic
joao  
#1 Posted : 5 years ago
joao

Rank: Newbie

Groups: Registered
Joined: 8/11/2020(UTC)
Posts: 1
Brazil
Location: Rio de Janeiro
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.
Back to top

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
Peter1000  
#2 Posted : 5 years ago
Peter1000

Rank: Advanced Member

Groups: Registered
Joined: 1/25/2019(UTC)
Posts: 305
Switzerland

Thanks: 17 times
Was thanked: 79 time(s) in 60 post(s)
Hi Jao

Look at our description of it here.

Settings to transmitt 8-channel Sound via SRT
Back to top
LeahGreen  
#3 Posted : 5 years ago
LeahGreen

Rank: Member

Groups: Registered
Joined: 3/20/2020(UTC)
Posts: 16
United States
Location: SAV

Thanks: 1 times
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.
Back to top
Peter1000  
#4 Posted : 5 years ago
Peter1000

Rank: Advanced Member

Groups: Registered
Joined: 1/25/2019(UTC)
Posts: 305
Switzerland

Thanks: 17 times
Was thanked: 79 time(s) in 60 post(s)
@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.
Back to top
LeahGreen  
#5 Posted : 5 years ago
LeahGreen

Rank: Member

Groups: Registered
Joined: 3/20/2020(UTC)
Posts: 16
United States
Location: SAV

Thanks: 1 times
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...
Back to top
LeahGreen  
#6 Posted : 5 years ago
LeahGreen

Rank: Member

Groups: Registered
Joined: 3/20/2020(UTC)
Posts: 16
United States
Location: SAV

Thanks: 1 times
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.
Back to top
Streamlab  
#7 Posted : 5 years ago
Streamlab

Rank: Newbie

Groups: Registered
Joined: 2/18/2020(UTC)
Posts: 7
Germany
Location: Munich

Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
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?
Back to top
WWW
LeahGreen  
#8 Posted : 5 years ago
LeahGreen

Rank: Member

Groups: Registered
Joined: 3/20/2020(UTC)
Posts: 16
United States
Location: SAV

Thanks: 1 times
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!
Back to top
pba  
#9 Posted : 4 years ago
pba

Rank: Advanced Member

Groups: Registered
Joined: 10/14/2015(UTC)
Posts: 147
Location: Hungary

Thanks: 38 times
Was thanked: 24 time(s) in 20 post(s)
Hello,

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

Thanks, Peter
Back to top
m-garanin  
#10 Posted : 4 years ago
m-garanin

Rank: Newbie

Groups: Registered
Joined: 12/6/2018(UTC)
Posts: 9
United States

Was thanked: 2 time(s) in 1 post(s)
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
Back to top
Users browsing this topic
Guest
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Privacy Policy | Powered by YAF.NET | YAF.NET © 2003-2025, Yet Another Forum.NET
This page was generated in 0.186 seconds.