Recherche avancée

Sur d’autres sites (7825)

• Unable to connect to RTSP server ffmpeg

  22 avril 2016, par JSC

  I am trying to stream video from my Android device to my laptop. I am using libstreaming for the RTSP client on my Android device and I am using ffmpeg for the server.

  I am trying to start the server using the following command(I’ve also included the output after running the command)

  ffmpeg -rtsp_flags listen -i rtsp://localhost:3001/test.sdp output.sdp
  
  
  
      ffmpeg version 2.8.6 Copyright (c) 2000-2016 the FFmpeg developers
  
      built with Apple LLVM version 7.0.2 (clang-700.1.81)
  
      configuration: --prefix=/usr/local/Cellar/ffmpeg/2.8.6 --enable-shared 
  
      --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables 
  
      --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl 
  
      --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid 
  
      --enable-libfaac --enable-nonfree --enable-vda
  
      libavutil      54. 31.100 / 54. 31.100
  
      libavcodec     56. 60.100 / 56. 60.100
  
      libavformat    56. 40.101 / 56. 40.101
  
      libavdevice    56.  4.100 / 56.  4.100
  
      libavfilter     5. 40.101 /  5. 40.101
  
      libavresample   2.  1.  0 /  2.  1.  0
  
      libswscale      3.  1.101 /  3.  1.101
  
      libswresample   1.  2.101 /  1.  2.101
  
      libpostproc    53.  3.100 / 53.  3.100

  However, my Android cannot connect to the server. Using nmap, I see that the port 3001 is closed. What am doing wrong ?

• HTML5 video not playing properly in Firefox browser on OS X

  10 août 2016, par Brian J

  The issue :

  I recently made a video that I would like to embed in my website as html5 video. I have the video in .mp4 and .ogv format. Here is a test page that I have set up with the video :

  http://www.briancjenkins.com/video_test/

  Here is the relevant html code that I used to embed the video :

  <video width="75%" controls="controls" loop="loop" poster="US_Inflation_Unemployment_Monthly_BP_Filtered.png">
  
    <source src="US_Inflation_Unemployment_Monthly_BP_Filtered.mp4" type="video/mp4">
  
    <source src="US_Inflation_Unemployment_Monthly_BP_Filtered.ogv" type="video/ogg">
  
    Your browser does not support the video tag.
  
  </source></source></video>

  The video plays perfectly on Safari (iOS and OS X), Chrome (OS X), and Firefox (iOS).

  However, the video does not play properly in Firefox on OS X. On both my desktop and laptop, when I play the video, the time bar moves, but there is no video. However, if I copy and paste the video URL into the Firefox address bar, the video plays fine. Here a the direct link to the .ogv-format video :

  http://www.briancjenkins.com/video_test/US_Inflation_Unemployment_Monthly_BP_Filtered.ogv

  I would like to know why the video is not playing in Firefox on OS X and how to fix the problem.

  What I know about the issue :

  I know that plenty of people have had trouble with html5 video and Firefox. And I also know from reading other questions that in some cases, the server is sending an incorrect mime type. I ran :

  $ curl -I http://www.briancjenkins.com/video_test/US_Inflation_Unemployment_Monthly_BP_Filtered.ogv

  and found that this does not seem to be the case here :

  Server: GitHub.com
  
  Content-Type: video/ogg

  which isn’t too surprising since Firefox will play the video hosted by Github, just not when its embedded in a webpage. Note that I also tried converting to .webm as an alternative to .ogv but that didn’t solve the issue.

  About the video

  The video was created in Python and and Matplotlib. I used Matplotlib to save the video to .mp4 and then I used ffmpeg to convert the video to .ogv format. Here is the ffmpeg command I used :

  $ ffmpeg -i US_Inflation_Unemployment_Monthly_BP_Filtered.mp4 -acodec libvorbis -ac 2 -ab 128k -ar 44100 -b:v 1800k  US_Inflation_Unemployment_Monthly_BP_Filtered.ogv

  It’s possible that I am not doing the conversion correctly, but I have tried several different variations on the conversion command. The video in question is hosted by Github.

• How can I use avformat_open_input function (ffmpeg)

  5 mai 2016, par johncarrie

  I have bought a HD HDMI to UVC device which has HDMI video source input and UVC for video output here.
  I connect it from laptop A (input source HDMI) to laptop B (output USB).
  I have installed Ubuntu 14.04 desktop on Laptop B and Win 8.1 on Laptop A.
  B also have ffmpeg, opencv and sdl library installed.
  My target is to capture video and audio from A via HD HDMI to UVC on B.
  So I have decided to use libav of ffmpeg.
  I saw this and used avformat_open_input function but this function returned error.
  I thought that the error was occurred because the second parameter of avformat_open_input (const char * url) was invalid.
  I know that the url should be like video:video device name:audio:audio card name.
  How can I indicate the device names ?

  Here’s the result of v4l2-ctl --list-devices command in terminal.

  HD WebCam (usb-0000:02:03.0-1):   
  
      /dev/video0
  
  HD TV CAM (usb-0000:03:00.0-2.1):   
  
      /dev/video1

  And the result of arecord -l in terminal.

  **** List of CAPTURE Hardware Devices ****  
  
  card 0: AudioPCI [Ensoniq AudioPCI], device 0: ES1371/1 [ES1371 DAC2/ADC]  
  
  Subdevices: 1/1  
  
  Subdevice #0: subdevice #0    
  
  card 1: CAM [HD TV CAM], device 0: USB Audio [USB Audio]    
  
  Subdevices: 1/1  
  
  Subdevice #0: subdevice #0  

  Thank you.