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

[Michael Shaffer]

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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