Recherche avancée

Sur d’autres sites (8524)

• Fix flv files that stop early

  19 octobre 2012, par Xonar

  I downloaded some flv videos some time ago and when watching them they stop at a point. If I skip past that point they continue playing fine up until another point which I can then skip past again (and the cycle goes on until the end of the video)

  I already tried

  avconv -i input.flv -acodec copy -vcodec copy -g 1 output.flv

  To my understanding from reading alot of mostly useless posts regarding this issue the there isn't any keyframes in my metadata and then stop when there is a bad frame.

  I tried setting -g higher but output.flv stops at the same point as where the original file stops for the first time. Is there any tool that can fix this.

  I can't remember where the original links are located and re-downloading isn't a option and as you can see my re-encoding attempts has failed.

  I am using Linux Ubuntu, so I can't use the Windows tools that are available.

• Streaming a webcam to a web server to be streamed on web

  19 octobre 2012, par gazzwi86

  I intend on streaming a web cam from a Raspberry Pi to a server, which can then serve the stream up to users over the web. I would ideally like the stream to work across all browsers with minimal complication, so the current mjpeg format I presume would not be ideal.

  Firstly, I would like to know if ffmpeg is the right tool for the job as its what I'm experimenting with at the moment ? I also looked at using ffmpeg and motion but didnt see the need for motion as I don't need motion detection. My config for ffmpeg is listed below :

  I installed via apt-get :

  apt-get install ffmpeg

  I have create a config file /etc/ffserver.conf containing the following :

  Port 80
  
  BindAddress 0.0.0.0
  
  MaxClients 10
  
  MaxBandwidth 50000
  
  NoDaemon
  
  
  
  <feed>
  
      file /tmp/webcam.ffm
  
      FileMaxSize 10M
  
  </feed>
  
  
  
  <stream>
  
      Feed webcam.ffm
  
      Format mpjpeg
  
      VideoSize 640x480
  
      VideoFrameRate 15
  
      VideoBitRate 2000
  
      VideoQMin 1
  
      VideoQMax 10
  
      strict -1
  
  </stream>

  I have created a file in the sbin called webcam.sh containing the following :

  ffserver -f /etc/ffserver.conf & ffmpeg -v verbose -r 5 -s 640x480 -f video4linux2 -i /dev/video0 http://localhost/webcam.ffm

  Running the above starts the stream but at the moment viewing http://webcam.mjpeg starts a file downloading which seems not to start in chrome and doing the same with and html file with the stream in a img tag doesnt work.

• Compilation error using ffmpeg library

  15 novembre 2012, par BartoNaz

  I have downloaded and installed the ffmpeg library. I want to use it for reading the separate frames of different videos and manipulate them. For that I tried to follow some tutorial from here : http://dranger.com/ffmpeg/tutorial01.html
  But I can't compile my cpp file since I get the following compilation :

  Undefined symbols for architecture x86_64:
  
    "av_register_all()", referenced from:
  
        _main in cc9zyUBe.o
  
        _main in ccRz35d4.o
  
  ld: symbol(s) not found for architecture x86_64
  
  collect2: ld returned 1 exit status

  When I was installing ffmpeg library, I used arch=x86_64 option in ./configure step.
  I use OS X Mountain Lion 10.8.2 and gcc 4.2 compiler.
  Does somebody have any clue what can be the reason of this error ?
  Thanks in advance.

  UPDATE :
  I've already tried many different install options, with static libraries, shared libraries, with/without —arch=x86_64 option. Also installed it with homebrew, result remains the same. Library isn't recognized. But ffmpeg binary works pretty well, when I use it as a command-line tool.