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• FFMPEG insert gif image to video with Nvidia GPU

  7 octobre 2020, par Alkitab Suhano

  I try to insert image.gif (position bottom of video) to video with FFMPEG for now it's work with CPU by using command

  


  ffmpeg -i "video.mp4" -ignore_loop 0 -i "C:/image.gif" -filter_complex "[1:v]scale=1280:-1[bottom];[0:v][bottom]vstack" -c:v libx264 -preset ultrafast -c:a aac output.mp4


  


  Then I try with Nvidia and get error

  


  ffmpeg -hwaccel cuvid -c:v h264_cuvid -vsync 0 -y -i "video.mp4" -ignore_loop 0 -i "C:/gifbnn.gif" -vf "hwupload_cuda,[1:v]scale_npp=1280:720:-1[bottom];[0:v][bottom]vstack" -c:v h264_nvenc -preset slow -cq 18 -c:a aac output.mp4


  


  I need some suggestions

  


  Thank you

  


• how to upload a video to google driver use paperclip or carriwave

  14 janvier 2016, par bách trần nguyên

  i want to upload video to google driver.
  code models
  video model

  class Video < ActiveRecord::Base
  
    has_attached_file :video,
  
     :storage => :google_drive,
  
     :google_drive_credentials => {:client_id => AppConfig.gg_drive.client_id,
  
                                :client_secret => AppConfig.gg_drive.client_secret,
  
                                :refresh_token => AppConfig.gg_drive.refresh_token,
  
                                :scope => AppConfig.gg_drive.scope,
  
                                :access_token => Token.cache_access_token_google_drive
  
                                },
  
    :styles => {
  
      :medium => {
  
        :geometry => "640x480",
  
        :format => 'mp4'
  
      },
  
      :thumb => { :geometry => "160x120", :format => 'jpeg', :time => 10} 
  
    },# hello 123
  
    :processors => [:transcoder],
  
    :google_drive_options => {
  
      :path => proc { |style| "#{style}_#{id}_#{image.original_filename}" },
  
      :public_folder_id => '0B0VNyOkzIwUZZFFGeVhycFk0dnc'
  
    }
  
  end

  in Gemfile

  gem 'google-api-client'
  
  gem 'paperclip'
  
  gem 'paperclip-googledrive'
  
  gem 'paperclip-av-transcoder'
  
  gem "paperclip-ffmpeg"

  in controller

  def create
  
      if params[:videos]
  
        params[:videos].each { |video| Video.create(video: video) }
  
      end
  
  end

  when i run , this display error

  [AV] Running command : if command -v avprobe 2>/dev/null ; then echo "true" ; else echo "false" ; fi
  [AV] Running command : if command -v ffmpeg 2>/dev/null ; then echo "true" ; else echo "false" ; fi
  Av::UnableToDetect in AlbumsController#create
  Unable to detect any supported library

  pls. how to fix this errors

• How to write v4l2 application with vivid (virtual video driver) for capturing video ?

  8 janvier 2016, par ransh

  I am trying to understand how to write v4l2 application.
  There is very well example in http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html , so I wanted to try to use it for capturing video with vivid (virtual device driver).

  I tried several resolution, pixelformat, different inputs,
  but on trying to display the captured file, it always has a sync problems ( the test bars of the video are keep moving in the horizontal axis).
  I tried to change resolution, pixelformat, in both capture application or player , but nothing helps.

  I compiled the v4l2 API example AS-IS from :
  http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html
  with minor modification in the —force part of the example (I also tried the example as is without modifications but it did not help), so that I choose hd input , and 1920x1080 resolution, V4L2_PIX_FMT_YUV420 (also tried V4L2_PIX_FMT_YUV422P) , progressive.

    if (force_format) {
  
              input = 3;  // <<-- HD input device
  
              if (-1==xioctl(fd,VIDIOC_S_INPUT,&input))
  
              {
  
               errno_exit("VIDIOC_S_INPUT");
  
              }
  
              fmt.fmt.pix.width       = 1920;
  
              fmt.fmt.pix.height      = 1080;
  
              fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV420; // <<- tried also V4L2_PIX_FMT_YUV422P
  
              fmt.fmt.pix.field       = V4L2_FIELD_NONE; // <- trying to capture progressive
  
  
  
              if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
  
                      errno_exit("VIDIOC_S_FMT");
  
  
  
      } else {

  I run the application with (the compiled code using pixelformat = V4L2_PIX_FMT_YUV420 trial ) :

  ./v4l2_example -f -o -c 10  > cap_yuv420p.yuv 

  And (the compiled code using pixelformat = V4L2_PIX_FMT_YUV422P trial )

  ./v4l2_example -f -o -c 10  > cap_yuv422p.yuv 

  I’ve tried to play them with :

  ffplay -f rawvideo -pixel_format yuv420p -video_size 1920x1080 -i cap_yuv420p.yuv 

  And

  ffplay -f rawvideo -pixel_format yuv422p -video_size 1920x1080 -i cap_yuv422p.yuv 

  These are the captured video files from my above trials :

  https://drive.google.com/folderview?id=0B22GsWueReZTUS1tSHBraTAyZ00&usp=sharing

  I probably am doing something wrong.
  Is there any idea what’s wrong in my configurations or how I can debug it better ?