Recherche avancée

Sur d’autres sites (6123)

• how to create a thumbnail, at the time of video upload ? [php / codeigniter]

  19 mai 2016, par Amol Phad sudhakar

  I am trying to create a thumbnail for my uploading video. searching for easiest way to generate thumbnail at the time of video upload itself. i think if some provide the code without using ffmpeg will be life saving for me. because i’m running my code on windows wamp or any other alternative welcomed too thank you.

  my real code is in CodeIgniter, not able to figure out how to do it.

  $postname = $this->input->post('post-name');
  
  
  
              $configVideo['upload_path'] = './video';
  
              $configVideo['max_size'] = '1000000024';
  
              $configVideo['allowed_types'] = 'avi|flv|wmv|mp4';
  
              $configVideo['overwrite'] = TRUE;
  
              $configVideo['remove_spaces'] = TRUE;
  
              $ext = get_mime_by_extension($_FILES['video']['name']);
  
              $video_name = str_replace(' ', '_', $postname);
  
              $configVideo['file_name'] = $video_name;
  
  
  
              $this->load->library('upload', $configVideo);
  
              $this->upload->initialize($configVideo);
  
  
  
              if (!$this->upload->do_upload('video')) {
  
  
  
                  $msg = $this->upload->display_errors();
  
                  $this->session->set_flashdata('error', $msg);
  
  
  
  
  
              } else {
  
                  $videoDetails = $this->upload->data(); 

• Font size messes up when I try to hardsub

  7 septembre 2020, par かかし９０００

  I have used the following command for a hardsub and everything worked but the subtitle size increased :

  


  ffmpeg -vsync 0 -i input.mkv -vf "ass=subs.ass" -c:a copy -c:v h264_nvenc -b:v 700k final.mp4


  


  i used a srt type file before using ass but that command made the text size take up almost half the screen and the force_style filter shows it executed properly but there was no change in text size at all

  


  though the ass sub style gets me a proper subtitle size i'd very much like it if the size was appropriate

  


• Capturing network video using opencv

  3 septembre 2014, par Subhendu Sinha Chaudhuri

  I am using ffserver and ffmpeg combination to capture web camera video and transmit it through my network.

  I want to capture this video using opencv and python from another computer.
  I can see the video (cam1.asf) in the browser of another computer. But my opencv + python code could not capture any frame.

  Code for ffserver

  HTTPPort 8090
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandWidth 2000
  
  
  
  <feed>
  
     File ./tmp/feed1.ffm
  
     FileMaxSize 1G
  
     ACL allow 127.0.0.1
  
  </feed>
  
  
  
  <stream>
  
    Feed feed1.ffm
  
    Format asf
  
    VideoCodec msmpeg4v2
  
    VideoFrameRate 30
  
    VideoSize vga
  
  </stream>

  FFmpeg

  $ffmpeg -f video4linux2 -i /dev/video0 192.168.1.3 /cam1.ffm

  This stream can be seen in the browser

  But with opencv code

  import sys
  
  import cv2.cv as cv
  
  import numpy
  
  
  
  video="http://http://192.168.1.3:8090/cam1.asf"
  
  capture =cv.CaptureFromFile(video)
  
  cv.NamedWindow('Video Stream', 1 )
  
  while True:
  
    # capture the current frame
  
    frame = cv.QueryFrame(capture)
  
    #if frame is None:
  
     # break
  
    #else:
  
      #detect(frame)
  
    cv.ShowImage('Video Stream', frame)
  
    if cv.WaitKey(10) == 27:
  
      print 'ESC pressed. Exiting ...'
  
      break

  I donot get any output in the stream

  My aim is to work with the web camera video both at the base station (ie where the web camera is connected) and also at the network location