Recherche avancée

Sur d’autres sites (10846)

• Best Web Video Encoding Practices for IOS (FFMpeg)

  21 juin 2012, par MagicMushroom

  I am working on an online video repository system for a client, written mostly in PHP. At the moment I am building a mobile version of our desktop website. Our desktop site allows users to watch videos in the browser, much like YouTube.

  My client uploads videos through the manager interface I have created, and my application uses FFmpeg on the server to transcode his videos into several resolutions and bitrates. I am no expert on FFmpeg, and while I do not know the ins and outs of each individual setting, I do understand how it works as a whole. Right now, we are using the mp4 container format with the h.264 codec to encode our videos. Our command looks like :

  ffmpeg -y -i "INPUT FILE.mov" -f mp4 -s 640x480 -vcodec libx264 -preset fast -maxrate 1500 -bitrate 1000 -bufsize 4096 -acodec libfaac -ab 192 -ac 2 "OUTPUT_FILE.mp4" >> "FILE.log" 2>&1 &

  I'm hoping to gain information about best practices with encoding video for web streaming on IOS and other mobile devices using FFmpeg. What resolutions and settings make for good mobile streaming video ? How can I ensure maximum compatibility across the sea of Android devices ?

• How to disable switchable graphics ?

  20 juillet 2021, par Hab-Land0

  Recently, I've updated my graphic drivers for a new system I built, a mix between an amd apu and an nvidia quadro. But I stumbled upon a rare problem, every time I tried to use OpenCl acceleration on ffmpeg for libx264 encoding, ffmpeg notifies me with the next line :

  


  [libx264 @ 0000028149222780] OpenCL acceleration disabled, switchable graphics detected


  


  My obvious step was to search everything I could around this "switchable graphics", but almost all the tutorials on websites told me that I should search around the driver's settings, but literally either Radeon Software or Nvidia's control panel don't display any option about it (It is worth to say that almost all of the tutorials refer to laptops with dedicated graphics and were very outdated).

  


  Another way I use OpenCL is for vapoursynth's filters, such as KNLMeansCL. And, when I make use of this filter, task manager detects that both AMD's APU and Nvidia's gpu are being used simultaneously (I guess that's how the switchable graphics actually works).

  


  My main complain with this is that I attempt to use AMD as a display driver and let Nvidia do the hard work, and I actually was able to do that before updating my drivers. And, talking about the "updates" more in-depth, I updated nvidia's from "462.59" to "471.11" and, unfortunately, I can't remember what versions were my AMD drivers.

  


• why jmf can't play rtp stream ?

  24 janvier 2017, par ahmet burak

  I produced an rtp link with ffmpeg and I tried to listen and play this stream. VLC and ffmpeg can play rtp stream, both work well but jmf doesn’t.

  Although there is no any error, jmf doesn’t play rtp stream and there is no sound.

  My rtp stream (http:.. is a radio link and rtp :... my stream)

  ffmpeg -i http://airspectrum.cdnstream1.com:8114/1648_128 -acodec copy -f rtp "rtp ://127.0.0.1:10000/audio/1"

  public void play() {
  
      MediaLocator mediaLocator = new MediaLocator("rtp://127.0.0.1:10000/audio/1");
  
      try {
  
          if (mediaLocator == null) {
  
              System.err.println("null locator");
  
          }
  
          player = Manager.createRealizedPlayer(mediaLocator);
  
          player.start();
  
      } catch (CannotRealizeException e) {
  
          e.printStackTrace();
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      } catch (NoPlayerException e) {
  
          e.printStackTrace();
  
      }
  
  
  
  }

  1. os ubuntu 16.08
  2. java jdk 1.8
  3. javax.media.jmf 2.1.1e (maven repo version)