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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 error to get a first 23 sec MP4 ; Output file #0 does not contain any stream

  19 juillet 2021, par klentit nonok

  How did ffmpeg error to get a first 23 sec MP4 file to be extracted to another :

  


  $ ffmpeg -t 23 Best\ Wild\ Animal\ Chases.mp4 -c copy -t 23 ~/Downloads/Best\ Wild\ Animal\ Chases.mp4 
ffmpeg version 4.3.1-2~mx19ahs+1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --prefix=/usr --extra-version='2~mx19ahs+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-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --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-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Output #0, mp4, to 'Best Wild Animal Chases.mp4:
Output file #0 does not contain any stream


  


  either this or without -c copy

  


  Any sincere useful help guide to the truth is invaluable

  


• Use FFMPEG without downloading full file

  19 août 2020, par servalex

  I'm generating thumbnails for a videos that are available from s3 and need to minimize traffic.
Frame is going to be from the first couple seconds of the video so the question : is there a way to get frame without passing the full file through network ?

  


  At the moment I'm passing video url to ffmpeg but seems like it downloads the whole file, not only first couple seconds.

  


  ffmpeg -ss 0 -noaccurate_seek -i {srcPresignedUrl} -vframes 1 -q:v 2 {outputFileName}

  


  I tried downloading first 10mb of the file and passing it, this works for some mp4 files, but fails on mov :

  


  ffmpeg.exe -ss 0 -i source.mov -vframes 1 -q:v 2 thumb.jpg
ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200726
  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 --enable-librav1e --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. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000017582ffff40] moov atom not found
source.mov: Invalid data found when processing input