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• ffmpeg - Live stream to web browser [on hold]

  21 octobre 2016, par Sreejith C M

  I was looking for a solution to stream my desktop live on my Windows system and found out ffmpeg is a good solution using dshow and everything is working fine and well. I’m using a C# wrapper for ffmpeg to record my desktop and I can save it in a local file.

  The problem I have is that, I have to watch the stream on my Web browser ( Chrome / Firefox ). I can’t use Media Server’s like wowza, red5 and also can’t use ffserver.

  I tried the ffmpeg wiki https://trac.ffmpeg.org/wiki and documentation but couldn’t figure out how to do this.

  Please help me to figure out this, how I can do this.

• Screencasting with hardware-accelerated gnome-3 [closed]

  30 octobre 2012, par Jeroen

  I am running Ubuntu 12.04 with gnome 3 shell, and I would like to create a screencast. I have tried using recordMyDesktop, Kazam Screencaster, and ffmpeg but all suffer from the same problem, which I think has to do with hardware acceleration in Gnome 3. The recorded videos all get very glitchy with blue space for all operations that use some sort of effect. Here is an example recording : http://www.stat.ucla.edu/ jeroen/files/screencast.mkv.

  The only method that does not seem to suffer from this, is the (largely undocumented) CTRL+SHIFT+R shortcut in gnome 3 that will start a recording. However, this feature is very buggy otherwise and often crashes when I enable audio input.

  My machine has a GeForce GT 120 with Apple LED Cinema monitor. I am using the proprietary nvidia drivers that ship with Ubuntu 12.04. Is there any way I can record the video as it appears on my screen ? I know I can avoid the problem by switching to gnome2 or unity 2d or anything that does not use effects, but I would prefer to make the recordings in my regular gnome 3 environment.

• Wrong video duration reported after concatenating video files in BASH script

  13 novembre 2012, par Benjen

  I am trying to merge three video files (each 16 seconds long) into one file using ffmpeg. Since they are in mpeg format I am simply trying to concatenate them into one file using cat command. The problem is that when I run the resulting file (video.mpg) it is reported as being 16 seconds long (same as the first concatenated video). Interestingly when I play the file in VLC, I can watch the whole 48 sec of video, even though the video progress bar also only reports up to 16 secs.

  It almost seems like the file "properties" (e.g. duration, etc) are not updated after the additional two videos are added using the cat command.

  Would appreciate any suggestions on how I might solve this.

  The following is the relevant section of the BASH script I have created :

  mkfifo intermediate1.mpg
  
  mkfifo intermediate2.mpg
  
  mkfifo intermediate3.mpg
  
  ffmpeg -i "./tmp/final01.mp4" -qscale 1 -y intermediate1.mpg < /dev/null &
  
  ffmpeg -i "./tmp/final02.mp4" -qscale 1 -y intermediate2.mpg < /dev/null &
  
  ffmpeg -i "./tmp/final03.mp4" -qscale 1 -y intermediate3.mpg < /dev/null &
  
  
  
  echo "[audioforge] Stitching files "
  
  cat intermediate1.mpg >> ./tmp/video.mpg
  
  cat intermediate2.mpg >> ./tmp/video.mpg
  
  cat intermediate3.mpg >> ./tmp/video.mpg
  
  
  
  # Convert back to mp4 format.
  
  ffmpeg -i "./tmp/video.mpg" -qscale 1 -y "./tmp/video.mp4"