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• Create 1 RTSP stream from 3 RTSP streams on Raspberry Pi 3

  29 mai 2020, par user3260912

  So this is interesting question and was wondering if anyone may have any insights to how I could do this. I currently have 6 IP cameras and run a Java process that opens ffmpeg to rip the RTSP streams from those 6 IP cameras, save a image to RAM, and then use ImageMagick to convert those files to a collage JPG image so I have all IP cameras in one image. That file then updates as rapidly as possible using space in /dev/shm - in reality, about 6 FPS. But, it uses 45-50% CPU on 6 cores.

  



  I'm looking for a way to reduce some CPU load off my main computer, though. I have 2 Raspberry Pi model 3Bs and am thinking I could maybe put them to good use. Not sure how the performance would be, but willing to test this.

  



  What I'm wanting to do is this :

  



  

  1. Use ffmpeg to pull down images from 3 of the IP camera RTSP streams on each Raspberry Pi into /dev/shm

  


  2. Using ImageMagick, montage the temp images pulled, into /dev/shm

  


  3. Create a RTSP stream on each Raspberry Pi of that montaged image in /dev/shm

  


  4. Use my desktop to pull down the RTSP of the collaged images and collage those to the same format I do today (only using 2 RTSP stream threads, instead of 6 to do this.)

  


  



  Is there a way to set ImageMagick to set image output format as mjpeg2 or have ffmpeg create a rtsp stream off the rapidly updating JPEG image file ?

  


• Pre- and postrecording using ffmpeg

  29 juillet 2020, par Sander

  I want to to be able to add a 1-2 second "prerecording" to an output file, like usually is the case on a cctv camera. (a few seconds video from before the alarm is triggered)

  



  I have an idea on how to have it work in a hacky way, but I'm sure there's already a better solution for it.
1 ffmpeg instance records on a 5 second loop outputting a video every 5 seconds
every 5 seconds the oldest file is removed to keep some space available via cron/script/loop/...
When the event is triggered a second ffmpeg instance starts recording for 5 seconds and prepends the last 5-second video from the other process to it's own video and outputs the final video to be prerecording+recording.mp4

  



  This script will run on a sd-powered device, so the less writes the better (but this could be done in a ramdisk)

  



  Is there a better way to do this ?

  


• 【carrierwave+ffmpeg】can't upload the video with sound

  10 avril 2020, par ken akita

  I want to make "Fake Instagram" Rails application.
then I made the uploader and I can upload the video(mp4), but no sound.
I can listen to the sound on my desktop but can't on my application, like this image, speakers not working.
enter image description here

  



  Code is here. I guess something wrong with image_uploader.rb or show.html.erb.
Note that first I made the ImageUploader to upload image, then I want to add video posting system to upload video. Both uploading done, but video without sound.
Really thank you for your advise !

  



  *image_uploader.rb
require 'streamio-ffmpeg'

class ImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick
  process resize_to_fit: [230, 183]

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  version :thumb do
    process resize_to_fit: [230, 183]
  end
  version :screenshot do
    process :screenshot
    def full_filename (for_file = model.logo.file)
      "screenshot.jpg"
    end
  end

  def screenshot
    tmpfile = File.join(File.dirname(current_path), "tmpfile")

    File.rename(current_path, tmpfile)

    movie = FFMPEG::Movie.new(tmpfile)
    movie.screenshot(current_path + ".jpg", {resolution: '230x183' }, preserve_aspect_ratio: :width)
    File.rename(current_path + ".jpg", current_path)

    File.delete(tmpfile)
  end

  def extension_whitelist
    %w(jpg jpeg gif png mp4)
  end
end


  



  *show.html.erb&#xA;<h1>Stroll</h1>&#xA;<p>&lt;%= notice %></p>&#xA;<p></p>&#xA;&lt;% if @stroll[:image] == nil %>&#xA;  &lt;%= image_tag"03summer_ver8-l.jpg", width:"230", height:"183" %>&#xA;&lt;% elsif @stroll.image.file.content_type.include?(&#x27;video/&#x27;) %>&#xA;  &lt;%= link_to @stroll.image_url.to_s do %>&#xA;  &lt;%= image_tag(@stroll.image_url(:screenshot).to_s, id: "image", :alt => "screenshot") %>&#xA;  &lt;% end %>&#xA;&lt;% else %>&#xA;  &lt;%= image_tag(@stroll.image.url) if @stroll.image &amp;&amp; @stroll.image.url %>&#xA;&lt;% end %>&#xA;<p>user &lt;%= @stroll.user.name %></p>&#xA;<p>『&lt;%= @stroll.title %>』</p>&#xA;<p>content: &lt;%= @stroll.content %></p>&#xA;<p>tag: &lt;%= @stroll.tag %></p>&#xA;<p>comment: </p>&#xA;<div>&#xA;  &lt;%= render partial: &#x27;comments/index&#x27;, locals: { comments: @comments, stroll: @stroll } %>&#xA;</div>&#xA;&lt;% if user_signed_in? &amp;&amp; @stroll.user_id != current_user.id %>&#xA;  &lt;%= render partial: &#x27;comments/form&#x27;, locals: { comment: @comment, stroll: @stroll } %>&#xA;&lt;% end %>&#xA;&lt;% if current_user %>&#xA;  &lt;% unless @stroll.user_id == current_user.id %>&#xA;    &lt;% if @favorite.present? %>&#xA;      &lt;%= link_to &#x27;cancel&#x27;, favorite_path(id: @favorite.id), method: :delete, class: &#x27;btn btn-info&#x27; %>&#xA;      &lt;% else %>&#xA;      &lt;%= link_to &#x27;Like！&#x27;, favorites_path(stroll_id: @stroll.id), method: :post, class: &#x27;btn btn-warning&#x27; %>&#xA;    &lt;% end %>&#xA;  &lt;% end %>&#xA;&lt;% end %>&#xA;&amp;emsp;&#xA;&lt;%= link_to "Index", strolls_path %>&#xA;