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• How to broadcast video to Vimeo stably by using ffmpeg ? [closed]

  5 octobre 2022, par akrsum

  I'm trying to broadcast video to Vimeo by using ffmpeg to broadcast from headless linux. Seemingly I can broadcast and video has no problem, but when I see analyzer, receiving bitrate is not stable.

  


  

  


  Nonetheless, ffmpeg always report stable bitrate.

  


  Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=  375 fps= 30 q=-1.0 size=    7840kB time=00:00:12.40 bitrate=5178.8kbits/s speed=   1x


  


  If I broadcast video from my laptop by using OBS, the analyzer shows stable connection.

  


  

  


  Here is a command I tried. Is there some problem ?

  


  ffmpeg -re -i  -codec copy -threads 4 -f flv /


  


• Encode uncompressed avi from webcam

  17 août 2013, par shaun

  I have to record videos for a project I'm doing. Two of these are USB cameras and another is a n IP overhead camera.All three are connected to a laptop computer. After recording the videos I need to be able to open them in an editor (not for editing particularly but for modeling stuff in them for which I need a timeline). I have chosen Sony Vegas Pro for my editor. I have been able to record the uncompressed avi using gstreamer with this command :

  gst-launch v4l2src device=/dev/video0 ! 'video/x-rawyuv,width=640,height=480,framerate=10/1' ! mux. avimux name=mux ! filesink location=temp.avi

  I had to set the framerate to 10 because I was using two USB cameras and a framerate of 30 on both could not be accomodated in the bandwidth of the USB controller. I do not care about audio in my file so I don't grab audio. Similary, while encoding I wouldn't care about audio as well. This is raw uncompressed avi. I was not able to open this in Sony Vegas Pro. I believe I need to encode this uncompressed avi using a codec that will be opened by Sony Vegas Pro (I don't know which codecs Sony likes, so I'll probably try different ones until one of them opens).

  For encoding this video, I have several options : mencoder, ffmpeg, gstreamer. But I am not able to figure out how to use these tools to get what I want. Ideally, I would like just to sort of "insert" a codec with other settings remaining the same. I don't really care about the how much space the resulting video takes since the length of the videos are not going to be more than 3 minutes and I have space available, so lossless codecs also work. I believe Sony reads mpeg avi's so if I can get that, it'll be great.

  Thanks for reading and I appreciate all the help.

• How to create a virtual webcamera device with ability to stream a video file in linux

  27 février 2020, par Vlad

  I need to create a script, that will stream a video file to virtual webcam, and make a virtual webcam accessible not only with ffplay /dev/videoX etc. but also with different applications like Cheese(default Ubuntu webcam app), Chrome, Discord and others.
  I tried solutions that use v4l2loopback and ffmpeg, but this doesn’t work in Chrome/Discord/Cheese/...
  Now I have several webcams :

  1. /dev/video0 - Native laptop camera
  2. /dev/video1 - A camera created with DroidCamX to use phones camera
     as laptop camera
  3. /dev/video2 - v4l2loopback camera

  When I try to stream a video file to /dev/video2 with ffmpeg, this message is showing up :

  user@hostname:~/Videos$ sudo ffmpeg -re -i "video.mp4" -map 0:0 -f v4l2 /dev/video2
  
  ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.83.100
  
    Duration: 02:09:13.10, start: 0.000000, bitrate: 279 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 798x598 [SAR 1:1 DAR 399:299], 146 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: mp3 (mp4a / 0x6134706D), 48000 Hz, stereo, s16p, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  [v4l2 @ 0x5609f238c280] ioctl(VIDIOC_G_FMT): Invalid argument
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
  
  Error initializing output  stream 0:0
  
  Conversion failed!

  But when I run that command with /dev/video0, a stream starts and shows with ffplay /dev/video0. But applications, except Mozilla Firefox cannot detect /dev/video0 stream.
  So how can I create a virtual camera device properly in order to stream a video file to it and use as a camera in various applications ?

  I have Linux Ubuntu 18.04.4 LTS, kernel version : 5.3.0-40-generic, architecture : x86-64.
  Any help appreciated !