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• ffmpeg : segmenting webcam video output on windows (dshow)

  2 mai 2021, par Arthur Hebert-Ryan

  I want to do exactly what is described in the post linked below, except on Windows using dshow instead of v4l2 :

  


  FFMPEG : Create contiguous videos from webcam

  


  My attempts all result in a single output file as though the segment options are being ignored. Here is my most basic command to try to get a series of 30s video files from my webcam :

  


  ffmpeg -f dshow -video_pin_name 1 -i video="USB Camera" -copyinkf -vcodec copy -f segment -segment_time 30 video_segment_%03d.mp4


  


  Command output :

  


  D:\videos>ffmpeg -f dshow -video_pin_name 1 -i video="USB Camera" -copyinkf -vcodec copy -f segment -segment_time 30 video_segment_%03d.mp4
ffmpeg version 4.3.2-2021-02-27-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
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
Input #0, dshow, from 'video=USB Camera':
Duration: N/A, start: 869580.415000, bitrate: N/A
    Stream #0:0: Video: h264 (Main) (H264 / 0x34363248), yuv420p, 1920x1080, 30 fps, 30 tbr, 10000k tbn, 20000k tbc
[segment @ 000001e814655640] Opening 'video_segment_000.mp4' for writing
Output #0, segment, to 'video_segment_%03d.mp4':
Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (Main) (H264 / 0x34363248), yuv420p, 1920x1080, q=2-31, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=  171 fps= 34 q=-1.0 size=N/A time=00:00:05.26 bitrate=N/A speed=1.04x


  


  I've tried :

  


  

  • using ssegment instead of segment

  


  • different output containers (.mp4, .h264, .avi, .mkv)

  


  • adding -map 0 and -an options

  


  • verifying that I'm getting keyframes from the output every second using the ffprobe command described here

  


  • adding -g 60

  


  


  But I get only one output file, which grows indefinitely. How do I capture from my webcam continuously into files of equal duration ?

  


  Here is a log of the same command using the -report option during 2+ minutes of capture (the log too big to paste into SO).

  


• 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 !

  


• compiling ffmpeg for Mac OSX High Sierra 10.13

  29 juillet 2021, par Martin

  Hello I made an electron app that uses ffmpeg to combine audio and renders video, it works fine on windows, linux, and modern mac osx computers, but a user has reported to me that on an older version of mac osx such as High Sierra 10.13, the way that I have setup ffmpeg does not work.

  


  I have a virtual machine with High Sierra v10.13 where I install RenderTune-mac.dmg from my RenderTune releases page, then I download 2 audio files and the image from this link. I open RenderTune, and try render a video. My command to combine the audio files into a single mp3 works fine, but when I try to combine that mp3 with the image file, the ffmpeg build I have packaged with my electron app fails with this error :

  


  Command was killed with SIGABRT (Aborted): /Applications/RenderTune.app/Contents/Resources/ffmpeg -loop 1 -framerate 2 -i /Users/martin/Downloads/R-3777978-1344032418-8379.jpeg.jpg -i /Users/martin/Downloads/output-871140.mp3 -y -acodec copy -b:a 320k -vcodec libx264 -b:v 8000k -maxrate 8000k -minrate 8000k -bufsize 3M -filter:v scale=w=1920:h=1954 -preset medium -tune stillimage -crf 18 -pix_fmt yuv420p -shortest /Users/martin/Downloads/concatVideo-871140.mp4
ffmpeg version git-2021-03-24-13335df Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: --pkgconfigdir=/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace/lib/pkgconfig --prefix=/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace --pkg-config-flags=--static --extra-cflags='-I/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace/include -mmacosx-version-min=10.10' --extra-ldflags='-L/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace/lib -mmacosx-version-min=10.10' --extra-libs='-lpthread -lm' --enable-static --disable-securetransport --disable-debug --disable-shared --disable-ffplay --disable-lzma --disable-doc --enable-version3 --enable-pthreads --enable-runtime-cpudetect --enable-avfilter --enable-filters --disable-libxcb --enable-gpl --enable-nonfree --disable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libx264
  libavutil      56. 66.100 / 56. 66.100
  libavcodec     58.128.100 / 58.128.100
  libavformat    58. 69.100 / 58. 69.100
  libavdevice    58. 12.100 / 58. 12.100
  libavfilter     7.107.100 /  7.107.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, image2, from '/Users/martin/Downloads/R-3777978-1344032418-8379.jpeg.jpg':
  Duration: 00:00:00.50, start: 0.000000, bitrate: 1758 kb/s
  Stream #0:0: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 590x600 [SAR 1:1 DAR 59:60], 2 fps, 2 tbr, 2 tbn, 2 tbc
Input #1, mp3, from '/Users/martin/Downloads/output-871140.mp3':
  Metadata:
    title           : My Little Grass Shack
    album           : Our Hawaii - A Collection Of Personal Favorites
    artist          : Society Of Seven
    track           : 11
    encoder         : Lavf58.69.100
  Duration: 00:06:25.59, start: 0.025057, bitrate: 320 kb/s
  Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
    Metadata:
      encoder         : Lavc58.12
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[swscaler @ 0x7fbad9167600] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x7fbad9040400] using SAR=2681/2679
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /Applications/RenderTune.app/Contents/Resources/ffmpeg
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /Applications/RenderTune.app/Contents/Resources/ffmpeg
  Expected in: /usr/lib/libSystem.B.dylib

    at makeError (/Applications/Render…eca/lib/error.js:59)
    at handlePromise (/Applications/Render…/execa/index.js:114)
    at async file:/Applicat…js/newindex.js:1323


  


  These files will render fine on windows/linux and recent mac versions. In order to package ffmpeg in my electron app on mac computers I had to build a custom sandboxed version with no dynamically linked libraries. I have a .sh file that automatically downloads ffmpeg and builds it with all the necessary flags for mac computers.
https://github.com/MartinBarker/RenderTune/blob/master/buildffmpeg.sh
Inside this .sh file is where I compile ffmpeg using these flags :

  


  ./configure \
    --pkgconfigdir="$WORKSPACE/lib/pkgconfig" \
    --prefix=${WORKSPACE} \
    --pkg-config-flags="--static" \
    --extra-cflags="-I$WORKSPACE/include -mmacosx-version-min=${MACOS_MIN}" \
    --extra-ldflags="-L$WORKSPACE/lib -mmacosx-version-min=${MACOS_MIN}" \
    --extra-libs="-lpthread -lm" \
        --enable-static \
        --disable-securetransport \
        --disable-debug \
        --disable-shared \
        --disable-ffplay \
        --disable-lzma \
        --disable-doc \
        --enable-version3 \
        --enable-pthreads \
        --enable-runtime-cpudetect \
        --enable-avfilter \
        --enable-filters \
        --disable-libxcb \
        --enable-gpl \
        --enable-nonfree \
        --disable-libass \
        --enable-libfdk-aac \
        --enable-libmp3lame \
        --enable-libx264 


  


  If I try to run this script in my High Sierra VM, it fails with this message :

  


  Unknown option "-extra-libs=-lpthread"

  


  if I remove that flag it fails with a different message :

  


  Unknown option "--enable-static"

  


  I need this flag in order to release my electron app on the mac apple store, can anyone help me compile a static version of ffmpeg that works on old versions like High Sierra 10.13 as well as works on modern mac os systems ?