[FFmpeg-user] Need help with Live Streaming using GPU

[Karan Singh]

Tried that , it increases the storage bandwidth but the number of videos
running without loss of frames remains same . My source video bit rate
comes  40 mbps when running on local vlc player

Is there any other issue that is causing problems in running more number of
simoultaneus streams ?

On Tuesday, October 8, 2019, Michael Shaffer <mikeshaffer at gmail.com> wrote:

> Try setting the output bitrate from the GPU to something higher. You have
> it set to 10M. Try 100M. I'm not sure what the maximum bitrate output is.
>
> On Mon, Oct 7, 2019 at 7:15 AM Karan Singh <karanveersingh5623 at gmail.com>
> wrote:
>
> > Hi Team
> >
> > i am struggling with live streaming of 4k videos with or without GPU.
> >
> > My question before describing my issue is what is number of 4k videos
> that
> > can transcoded and live streamed using below configuration .
> >
> >
> > 1 X R740xd dell system  - configuration is 2 socket , 88 core processors
> > with 256 GB of RAM- (ubuntu 18.04.02 OS )
> >
> >  +
> >
> > Tesla T4 GPU
> >
> > +
> >
> > Nginix & RTMP
> >
> > Transcoding and streaming all happening in one system , viewing of stream
> > is in windows system with vlc player .
> >
> >
> > Below is the first command I was trying , the issue is that the video
> live
> > streaming runs perfectly with 6 simultaneous streams of 4k but when the
> 7th
> > stream starts , all goes bad and fps start dropping [ Its with CPU ] .
> The
> > only thing i notice is more CPU utilization and that could be reason of
> FPS
> > drop
> >
> >
> > ffmpeg -re -i Stranger09.mkv -c:v libx264 -b:v 50M -preset ultrafast
> -tune
> > zerolatency -b:a 128k -s 4096x2160 -bufsize 5M -x264opts keyint=500 -g 60
> > -pix_fmt yuv420p -f flv rtmp://194.167.137.11/live-test/Strange09_4k
> >
> >
> > Some guys on IRC channel recommended me to omit / edit below mentioned
> > parameters but still its not working
> >
> > Remove -tune zerolatency
> >
> > keyint=500 -g 60 , both are same so does use it together
> >
> > need to limit thread by adding  -thread x
> >
> >
> > I tried using GPU to scale up the simultaneous streaming but it also
> going
> > bad after 6 streams , below is the command . Here I can see less CPU
> > utilization , like 20% , 80% is still free but GPU is 100% stressed .
> >
> >
> > fmpeg -hwaccel_device 1 -hwaccel cuvid -re -i Stranger02.mkv -c:v
> > h264_nvenc -preset fast -b:v 10M -bufsize 20M -x264opts keyint=500
> -pix_fmt
> > yuv420p -f flv rtmp://194.167.137.11/live-test/Strange02_4k
> >
> >
> > I tried using GPU + CPU as 80% CPU is free after 100% GPU utilization
> but I
> > cannot run more than 7 simultaneous streams .
> >
> >
> > Please help me with correct usage of FFMPEG to scale up the 4k videos .
> >
> > My end goal is to achieve 1Gbps read/writes on storage media. Network is
> > not in picture as transcoding and streaming all running on 1 server .
> >
> >
> >
> >
> > Regards
> >
> > Karan Singh
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