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• Performance issue in streaming desktop out of a Raspberry with FFMPEG

  30 avril 2021, par skynet

  I'm quite a newbie in FFMPEG and I apologize in advance for any inaccuracy I may write.

  


  My goal is to stream over UDP a Full HD (1920x1080) desktop connected to a Raspberry PI 4 - 4 GB RAM.

  


  I made many attempts, and currently this the setup with better performance I found (I used the knowledge in https://www.willusher.io/general/2020/11/15/hw-accel-encoding-rpi4).

  


  

  1. I installed the 64-bit Raspbian OS on the PI from this link : https://www.raspberrypi.org/forums/viewtopic.php?t=275370

  


  


  This because the HW H264 encoder (h264_v4l2m2m) is faster than the 32-bit encoder h264_omx

  


  

  2. I downloaded and installed FFMPEG 4.4, using this configuration
./configure —prefix="$HOME/ffmpeg_build" —pkg-config-flags="pkg-config —static" —extra-cflags="-I$HOME/ffmpeg_build/include" —extra-ldflags="-L$HOME/ffmpeg_build/lib" —extra-libs="-lpthread -lm" —bindir="$HOME/bin" —enable-gpl —enable-gnutls —disable-libaom —enable-libass —enable-libfdk-aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libvorbis —enable-libvpx —enable-libx264 —disable-libx265 —enable-nonfree —arch=aarch64 —disable-libxml2 —enable-libwebp—enable-libdrm

  


  


  I used FFMPEG 4.4 because of compatibility issues with h264_v4l2m2m of the shipped FFMPEG version 4.1.4

  


  


  3. I use this command

     


     ffmpeg -f x11grab -probesize 42M -s 1920x1080 -i :0.0 -c:a copy -c:v h264_v4l2m2m -num_output_buffers 32 -num_capture_buffers 16 -b:v 8M -minrate 8M -maxrate 8M -pix_fmt rgb24 -f mpegts udp ://239.255.90.60:5004 ?pkt_size=1316

     


  


  


  The -pix_fmt rgb24 flag is needed because x11grab in 64 bit OS use BGR0 chroma subsampling... which means red and blue colours are inverted !

  


  This is the output :

  


  ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers  
  built with gcc 8 (Debian 8.3.0-6)  
  configuration: --prefix=/home/pi/ffmpeg_build --pkg-config-flags='pkg-config --static' --extra-cflags=-I/home/pi/ffmpeg_build/include --extra-ldflags=-L/home/pi/ffmpeg_build/lib --extra-libs='-lpthread -lm' --enable-gpl --enable-gnutls --disable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --disable-libx265 --enable-nonfree --arch=aarch64 --disable-libxml2 --enable-libwebp --enable-libdrm  
  libavutil      56. 70.100 / 56. 70.100  
  libavcodec     58.134.100 / 58.134.100  
  libavformat    58. 76.100 / 58. 76.100  
  libavdevice    58. 13.100 / 58. 13.100  
  libavfilter     7.110.100 /  7.110.100  
  libswscale      5.  9.100 /  5.  9.100  
  libswresample   3.  9.100 /  3.  9.100  
  libpostproc    55.  9.100 / 55.  9.100  
Input #0, x11grab, from ':0.0':  
  Duration: N/A, start: 1619778505.990981, bitrate: 1988667 kb/s  
  Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 1920x1080, 1988667 kb/s, 29.97 fps, 56   tbr, 1000k tbn, 1000k tbc  
Stream mapping:  
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_v4l2m2m))  
Press [q] to stop, [?] for help  
[h264_v4l2m2m @ 0x5598d14070] Using device /dev/video11  
[h264_v4l2m2m @ 0x5598d14070] driver 'bcm2835-codec' on card 'bcm2835-codec-encode' in mplane mode  
[h264_v4l2m2m @ 0x5598d14070] requesting formats: output=RGB3 capture=H264  
[h264_v4l2m2m @ 0x5598d14070] Failed to set gop size: Invalid argument  
Output #0, mpegts, to 'udp://239.255.90.60:5004?pkt_size=1316':  
  Metadata:  
    encoder         : Lavf58.76.100  
  Stream #0:0: Video: h264, rgb24(pc, progressive), 1920x1080, q=2-31, 8000 kb/s, 56 fps, 90k tbn  
    Metadata:  
      encoder         : Lavc58.134.100 h264_v4l2m2m  
[mpegts @ 0x5598d12c10] Non-monotonous DTS in output stream 0:0; previous: 0, current: 0; changing   to 1. This may result in incorrect timestamps in the output file.  
frame=  799 fps= 16 q=-0.0 size=   16180kB time=00:00:49.19 bitrate=2694.2kbits/s speed=   1x 


  


  As you can see my issue is that the fps value is about 15 when streaming an HD video with VLC in full-screen mode (the fps value depends on what is displayed on screen, which I find odd being the encoding process should be done in HW).

  


  So the question is : any hope I can get close to 25 fps, so to have a smooth display on the receiver ? Either using a better FFMPEG command or tweaking the Raspberry ?

  


  Thanks for any help !

  


• ffmpeg zmq protocol not found

  2 juin 2022, par maplgebra

  Using this example from the ffmpeg doc : https://ffmpeg.org/ffmpeg-protocols.html#toc-zmq

  


  ffmpeg -re -i input -f mpegts zmq:tcp://127.0.0.1:5555

  


  but just got the error :

  


  zmq:tcp://127.0.0.1:5555: Protocol not found

  


  Here is my ffmpeg version info :

  


  ffmpeg -version           
ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil      56. 31.100 / 56. 31.100
libavcodec     58. 54.100 / 58. 54.100
libavformat    58. 29.100 / 58. 29.100
libavdevice    58.  8.100 / 58.  8.100
libavfilter     7. 57.100 /  7. 57.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  5.100 /  5.  5.100
libswresample   3.  5.100 /  3.  5.100
libpostproc    55.  5.100 / 55.  5.100


  


  it states that has included --enable-libzmq, I dont't know how to solve this problem.

  


• ffmpeg youtube live stream settings screen output [closed]

  25 juin 2020, par brainoverflowse
  


  


  Below works but I do get some warnings:

    ffmpeg -rtsp_transport tcp -i rtsp://admin:password@192.168.0.121:5542/Streaming/Channels/1 -tune zerolatency -vcodec libx264 -pix_fmt + -c:v copy -c:a aac -f flv rtmp://a.rtmp.youtube.com/live2/streamcode
ffmpeg version git-2020-06-20-29ea4e1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200523
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 55.100 / 56. 55.100
  libavcodec     58. 93.100 / 58. 93.100
  libavformat    58. 47.100 / 58. 47.100
  libavdevice    58. 11.100 / 58. 11.100
  libavfilter     7. 86.100 /  7. 86.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, rtsp, from 'rtsp://admin:password@192.168.0.121:5542/Streaming/Channels/1':
  Metadata:
    title           : Media Presentation
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Main), yuv420p(progressive), 1920x1080, 20 fps, 30 tbr, 90k tbn, 40 tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Multiple -c, -codec, -acodec, -vcodec, -scodec or -dcodec options specified for stream 0, only the last option '-c:v copy' will be used.
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 000002a2862cb900] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/streamcode':
  Metadata:
    title           : Media Presentation
    encoder         : Lavf58.47.100
    Stream #0:0: Video: h264 (Main) ([7][0][0][0] / 0x0007), yuv420p(progressive), 1920x1080, q=2-31, 20 fps, 30 tbr, 1k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 8000 Hz, mono, fltp, 48 kb/s
    Metadata:
      encoder         : Lavc58.93.100 aac
[flv @ 000002a285413200] Non-monotonous DTS in output stream 0:0; previous: 283, current: 33; changing to 283. This may result in incorrect timestamps in the output file.
[flv @ 000002a285413200] Non-monotonous DTS in output stream 0:0; previous: 283, current: 100; changing to 283. This may result in incorrect timestamps in the output file.
[flv @ 000002a285413200] Non-monotonous DTS in output stream 0:0; previous: 283, current: 133; changing to 283. This may result in incorrect timestamps in the output file.
[flv @ 000002a285413200] Non-monotonous DTS in output stream 0:0; previous: 283, current: 200; changing to 283. This may result in incorrect timestamps in the output file.
[flv @ 000002a285413200] Non-monotonous DTS in output stream 0:0; previous: 283, current: 233; changing to 283. This may result in incorrect timestamps in the output file.
frame=22107 fps= 20 q=-1.0 size=  713271kB time=00:18:25.30 bitrate=5286.4kbits/s speed=   1x

-----------------

This is what I receive this repeating in yellow when something happens to the stream connection:

    [flv @ 0000026847b60040] Non-monotonous DTS in output stream 0:1; previous: 47046874, current: 7601881; changing to 47046874. This may result in incorrect timestamps in the output file.

  


  


  



  Great site for info and I have learned quite a bit so far in my quest to learn programming. There are a bunch of us who live stream to youtube and use ffmpeg. All we want to do is with the least amount of flags in our command line and make it simple to send a live rtsp connection from our cameras to youtube. I know we have some command line interpretations that we have wrong or need to be taken out or added. Could any of you assist with what we would need to resolve our yellow warnings and when it appears the rtsp stream crashes. I apologize with the learning curve for entering code into the post.