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

[Bo Zhou]

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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