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• My Raspberry pi doesnt capture frames even though pi cam is detected in index 0

  1er mars 2024, par Yassine Benkhalouk

  I'm using Raspberry Pi 4 Model B with Pi camera module v3, I'm trying to launch an RTSP stream server that streams camera feed, I've been using this RTSP library, when I run the server script :

  


  import cv2
from zephyr import Stream

if __name__ == "__main__":
  stream = Stream(
    url="rtsp://localhost:8554/test",
    resolution=(1280, 720),
    fps=30,
    bitrate="2M"
  )

  cap = cv2.VideoCapture(0)
  while True:
    ret, frame = cap.read()
    stream.send(frame)


  


  I get :

  


  Traceback (most recent call last):&#xA;  File "/home/pi/testserver1.py", line 15, in <module>&#xA;    stream.send(frame)&#xA;  File "/home/pi/innov/venv/lib/python3.11/site-packages/zephyr/stream/stream.py", line 174, in send&#xA;    frame = cv2.resize(frame, self.resolution)&#xA;            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^&#xA;cv2.error: OpenCV(4.8.1) /io/opencv/modules/imgproc/src/resize.cpp:4062: error: (-215:Assertion failed) !ssize.empty() in function &#x27;resize&#x27;&#xA;</module>

  


  even though my camera is detected :

  


  (venv) pi@YassinePi:~ $ libcamera-still --list-cameras
Available cameras
-----------------
0 : imx708 [4608x2592 10-bit RGGB] (/base/soc/i2c0mux/i2c@1/imx708@1a)
    Modes: 'SRGGB10_CSI2P' : 1536x864 [120.13 fps - (768, 432)/3072x1728 crop]
                             2304x1296 [56.03 fps - (0, 0)/4608x2592 crop]
                             4608x2592 [14.35 fps - (0, 0)/4608x2592 crop]


  


  I've tried changing the index from 1,-1,2 didn't work

  


  I think it may be because this code is designed for desktop computers, or I didn't install the required packages correctly

  


  For the second reason since I don't have experience with Raspbian OS, I reinstalled the OS and installed the packages all over again, still doesn't work.

  


  Any idea how to solve this issue ? Or there is an alternative way to do this ?

  


• Getting error on video with Ruby on Rails 4 App

  30 avril 2016, par D.Graves

  So this is the error I get right after I try and upload my video

  

  This is my post show

  <%= video_tag @post.video.url(:medium), controls: true, style: "max-width: 100%;" %>
  
  
  
  <p>
  
    <strong>Description:</strong>
  
  &lt;%= @post.description %>
  
  </p>
  
    &lt;% if @post.user == current_user %>
  
    &lt;%= link_to 'Edit', edit_post_path(@post) %> 
  
  &lt;% end %>|
  
  &lt;%= link_to 'Back', posts_path %>

  This is my post model

  class Post < ActiveRecord::Base
  
   belongs_to :user
  
  
  
   has_attached_file :video, styles: {
  
      :medium => {
  
        :geometry => "640x480",
  
        :format => 'mp4'
  
      },
  
      :thumb => { :geometry => "160x120", :format => 'jpeg', :time => 10}
  
  }, :processors => [:transcoder]
  
  validates_attachment_content_type :video, content_type: /\Avideo\/.*\Z/
  
  end

  I am curious if anyone has run into this before and I am wondering if I can get any help on how to fix this. I am using paperclip av-transcoder gem, ffmpeg and paperclip gem. I can add any more information if needed

  Here is my post controller if this helps

  def index
  
  @posts = Post.all
  
  end
  
  
  
  def show
  
  end
  
  
  
  def new
  
  @post = current_user.posts.build
  
  end
  
  
  
  def edit
  
  end
  
  
  
  def create
  
  @post = current_user.posts.build(post_params)
  
  if @post.save
  
    redirect_to @post, notice: 'Post was successfully created.'
  
  else
  
    render :new
  
  end
  
  end
  
  
  
  def update
  
  if @post.update(post_params)
  
    redirect_to @post, notice: 'Post was successfully updated.'
  
  else
  
    render :edit
  
  end
  
  end
  
  
  
  def destroy
  
  @post.destroy
  
  redirect_to posts_url
  
  end
  
  
  
  private
  
  def set_post
  
    @post = Post.find_by(id: params[:id])
  
  end
  
  
  
  def correct_user
  
    @post = current_user.posts.find_by(id: params[:id])
  
    redirect_to posts_path, notice: "Not authorized to edit this post" if @post.nil?
  
  end
  
  
  
  def post_params
  
    params.require(:post).permit(:description, :video)
  
  end
  
  
  
  
  
   end

• Rails 3 : How can I make Paperclip-FFMPEG work ?

  9 novembre 2011, par remino

  I have Rails 3.0.3 with these gems :

  • delayed_job 2.1.4
  • delayed_paperclip 0.7.1
  • paperclip 2.3.16
  • paperclip-ffmpeg 0.7.0

  (This combination is very specific. Some newer gems will not work with others.)

  Here's my Video model :

  class Video < Upload
  
    has_attached_file :file, :default_style => :view, :processors => [:ffmpeg],
  
      :url => '/system/:class/:attachment/:id/:style/:basename.:extension',
  
      :path => ':rails_root/public/system/:class/:attachment/:id/:style' \
  
        + '/:basename.:extension',
  
      :default_url => '/images/en/processing.png',
  
      :styles => {
  
        :mp4video => { :geometry => '520x390', :format => 'mp4',
  
          :convert_options => { :output => { :vcodec => 'libx264',
  
            :vpre => 'ipod640', :b => '250k', :bt => '50k',
  
            :acodec => 'libfaac', :ab => '56k', :ac => 2 } } },
  
        :oggvideo => { :geometry => '520x390', :format => 'ogg',
  
          :convert_options => { :output => { :vcodec => 'libtheora',
  
            :b => '250k', :bt => '50k', :acodec => 'libvorbis',
  
            :ab => '56k', :ac => 2 } } },
  
        :view => { :geometry => '520x390', :format => 'jpg', :time => 1 },
  
        :preview => { :geometry => '160x120', :format => 'jpg', :time => 1 }
  
      }
  
    validates_attachment_content_type :file, :content_type => VIDEOTYPES,
  
      :if => Proc.new { |upload| upload.file.file? }
  
    process_in_background :file
  
  end

  When creating a new Video object with attachment, the original is saved, but no conversion will be done. Even calling Video.last.file.reprocess! won't to a thing except returning true. (Not sure what "true" means in this case as it didn't work.)

  I tried hardcoding the path to ffmpeg in Paperclip::options[:command_path]. I even tried deleting the paperclip-ffmpeg.rb file and replacing it with a blank file. Really thinking I'd get an exception by doing the later, instead, I simply got "true" again.

  It feels like the paperclip-ffmpeg.rb is being loaded, because it is required by config/application.rb, but nothing is called in it when trying to generate a thumbnail or convert a video.

  Can anyone help me with this ? Thanks in advance !