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

[Michael Shaffer]

I'm no expert but it sounds like you've reached the limitations of your CPU
/ GPU.

On Thu, Oct 10, 2019 at 1:07 AM Karan Singh <karanveersingh5623 at gmail.com>
wrote:

> Didn't get your point , can you elaborate ?
> I am able to run 6 live streams with before mentioned parameters but after
> that frames start dropping and CPU/GPU usage reaches 80~100% . Memory and
> storage bandwidth is not much used .
> If you can help me in correct usage of parameters with live streaming ,
> that would be great .
>
> Regards
> Karan Singh
>
> On Thu, Oct 10, 2019 at 11:47 AM Bo Zhou <bo.schwarzstein at gmail.com>
> wrote:
>
> > Have you benchmark the ffmpeg during the runtime to check where is the
> > bottleneck ?
> >
> > On Thu, Oct 10, 2019 at 10:11 AM Karan Singh <
> karanveersingh5623 at gmail.com
> > >
> > wrote:
> >
> > > Hi Team
> > >
> > > Any update on this?
> > >
> > >
> > > 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 .
> > >
> > > On Wed, Oct 9, 2019 at 10:47 AM Karan Singh <
> > karanveersingh5623 at gmail.com>
> > > wrote:
> > >
> > > > >  The nginx server, how many workers are running?
> > > >
> > > > 1024 workers running
> > > >
> > > > On Tue, Oct 8, 2019 at 12:14 PM Ted Park <kumowoon1025 at gmail.com>
> > wrote:
> > > >
> > > >> > Is there any other issue that is causing problems in running more
> > > >> number of
> > > >> > simoultaneus streams ?
> > > >>
> > > >> The nginx server, how many workers are running?
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