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• ffmpeg rtmp streaming at 30fps

  19 janvier 2018, par user6326558

  I am trying to stream my desktop to facebook rtmp server using screen-capture-recorder :

  ffmpeg -re  -f dshow -i audio="virtual-audio-capturer" -hwaccel cuvid 
  
  -f dshow -i video=screen-capture-recorder  -r 30 -rtbufsize 1024M 
  
  -filter:v scale=480:360 -vcodec libx264 
  
  -pix_fmt yuv420p -preset fast -b:v 8M -maxrate:v 10M  -c:a aac -b:a 128k 
  
  -ar 44100 -f flv rtmp://live-api.facebook.com:80/rtmp/..............

  But when I start streaming, it says that fps is only 10 and sometimes it immediatelly on start-up yells following error. Then, when I start to do something on my computer, for example I run a game, I keep getting that warning 20 times per second, and streamed video is 0.5 fps.

  real-time buffer [screen-capture-recorder] [video input] too full or near
  too full (545% of size : 3041280 [rtbufsize parameter]) ! frame dropped !

  When I stream it into file,

  ffmpeg -re  -f dshow -i audio="virtual-audio-capturer" -hwaccel cuvid 
  
  -f dshow -i video=screen-capture-recorder  -r 30 -rtbufsize 1024M 
  
  -filter:v scale=480:360 -vcodec libx264 
  
  -pix_fmt yuv420p -preset fast -b:v 8M -maxrate:v 10M  -c:a aac -b:a 128k 
  
  -ar 44100 D:\test.mp4 -y

  it says streaming is 30 fps, but as soon as I start doing something, for example game, the metioned situation repeats, tens of errors, and 0,5 fps video.

  I tried chanching -rtbufsize from 8 to 2048 megabytes, nothing changed. I tried adding and disablinh hw acceleration, nothing changed. Can anyone tell me, what am I doing wrong ? Thank you

  Solved -rtbufsize 1024M must be before -i. Another thing, I rather used codec h264_nvenc from nvidia for cuda acceleration, now I can stream into file at 30 fps without problems and warnings, even while playing game (Call of duty 6, HW draining). However, when I try to stream to rtmp, I also get no warnings, but I can stream at only 15 fps. Is it also possible to stream to rtmp at 30 fps with my command configuration ?

  If needed, my ffmpeg build config is :

  ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers

  built with gcc 7.1.0 (GCC)
  configuration : —disable-static —enable-shared —enable-gpl —enable-version3 —enable-cuda —enable-cuvid —enable-d3d11va —enable-dxva2 —enable-libmfx —enable-nvenc —enable-avisynth —enable-bzlib —enable-fontconfig —enable-frei0r —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libfreetype —enable-libgme —enable-libgsm —enable-libilbc —enable-libmodplug —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenh264 —enable-libopenjpeg —enable-libopus —enable-librtmp —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libtheora —enable-libtwolame —enable-libvidstab —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-lzma —enable-zlib

• FFmpeg stream dynamic png

  13 avril 2017, par Azarus

  I would like to know if its possible to stream a png or any kind of image using ffmpeg. I would like to generate the image contiously using nodejs that updates every 10 seconds. I would like to display game stats with this in a corner and mix it with some background music or pre recorded commentary on it. Additionaly i would like to mix a video and the image should act like an overlay.

  I am also not sure if using a transparent png image its possible to do

  I couldn’t get my head around doing the mixing with ffmpeg and its looks very complicated so i would like to get some help on it.

  I have video files stored in a folder that i would like to continously stream and mix different music and an image on it. I would like to have it all continously working without stopping the stream.

  Is it possible with ffmpeg cli on linux or i cant avoid using a desktop windows pc for such thing ?

• FFmpeg - How to encode raw screen buffers (frame arrays) into a bitstream ?

  23 mars 2021, par bbasaran

  I have thousands of frame arrays (NumPy) with shape (3, 225, 400), which were obtained from game screens.

  


  Each one of those frame buffers has a label (screen class and timestamp). I'd like to create a bitstream from those arrays, to be used for analysis with an RNN or similar ML technique.

  


  Can I use FFmpeg to create a bitstream (e.g. bitrate on the y-axis, timestamp on the x-axis) ?

  


  I appreciate any help, thanks !