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• swscale/aarch64/yuv2rgb : add neon yuv42{0,2}p -> gbrp unscaled colorspace converters

  6 août 2024, par Ramiro Polla

  swscale/aarch64/yuv2rgb : add neon yuv420,2p -> gbrp unscaled colorspace converters
  checkasm —bench on a Raspberry Pi 5 Model B Rev 1.0 :
  
  yuv420p_gbrp_128_c : 1243.0
  
  yuv420p_gbrp_128_neon : 453.5
  
  yuv420p_gbrp_1920_c : 18165.5
  
  yuv420p_gbrp_1920_neon : 6700.0
  
  yuv422p_gbrp_128_c : 1463.5
  
  yuv422p_gbrp_128_neon : 471.5
  
  yuv422p_gbrp_1920_c : 21343.7
  
  yuv422p_gbrp_1920_neon : 6743.5
  

  • [DH] libswscale/aarch64/swscale_unscaled.c
  • [DH] libswscale/aarch64/yuv2rgb_neon.S

• Way to bypass video upload when testing using Rspec

  1er mars 2014, par Justin

  I'm testing a page on my app that shows videos. I'm trying to speed up the test by bypassing the video upload process or another way ??

  Maybe I'm using FactoryGirl incorrectly for file uploads..

  Using FactoryGirl, I'm creating the video with

  FactoryGirl.define do
  
   factory :video do
  
    user_id 1
  
    type "Live"
  
    title "FooBar"
  
    description "Foo bar is the description"
  
    video { fixture_file_upload(Rails.root.join('spec', 'files', 'concert.mov'), 'video/mp4') }
  
   end
  
  end

  And in the request's spec I'm describing the videos as :

  describe "videos page" do
  
  
  
    let(:user) { FactoryGirl.create(:user) }
  
    let!(:video1) { FactoryGirl.create(:video) }
  
  
  
    before { visit user_video_path(user) }
  
  
  
    it { should have_title(user.name) }
  
    it { should have_content(user.name) }
  
  
  
    describe "videos" do
  
      it { should have_content(video1.description) }
  
    end
  
  end

  Now, everytime I run the test for this page it goes through the file upload process which takes more time. I'm also using FFmpeg

  **video.rb (video model)**
  
  
  
  validates :video, presence: true
  
  has_attached_file :video, :styles => {
  
                                        :medium => { :geometry => "640x480", :format => 'mp4' },
  
                                        :thumb => { :geometry => "470x290#", :format => 'jpg', :time => 10 }
  
                                       }, 
  
                            :processors => [:ffmpeg]

  What this does when I test the page is the CLI goes through the video upload process like it would if you were uploading the video and watching your local server.

• hardware conversion of image pixel format in ffmpeg ?

  18 janvier 2024, par dongrixinyu

  I am trying to decode an online rtmp video stream into RGB format frames, and then encoding RGB frames into an online stream.

  


  Task

  


  Here is what I do now :

  


  


  decoding a video stream to get images(RGB) ---> ai model process ---> encoding frames(RGB) to form a video stream in H264

  


  


  My scheme

  


  All my code in written in C with FFmpeg dependencies. The detailed steps are :

  


  


  rtmp/rtsp video stream ---> AVPacket ---(nvidia cuda)---> AVFrame(nv12 pix fmt) ---> AVFrame(RGB pix fmt) ---> AI process.

  


  


  


  AVFrame(RGB pix fmt) ---> AVFrame(nv12 pix fmt) ---(nvidia cuda)---> AVPacket ---> rtmp/rtsp video stream

  


  


  Now, the decoding and encoding part are run on NVIDIA GPU, which is quite fast.

  


  But the conversion of pixel format between AV_PIX_FMT_NV12 and AV_PIX_FMT_RGB is run on CPU, which is astonishingly CPU-consuming cause the size of video frame is 2k.

  


  My question

  


  So, is there any off-the-shelf method to fulfill the conversion of image pixel format on GPU (especially via cuda) directly ?