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• ffmpeg : Is this a bug in Xcode ?

  30 avril 2014, par daozhao

  I debug the ffmpeg program on the macosx with xcode.I find a bug with xcode(or lldb)。

  code @ ffmpeg_opt.c-->static int open_input_file(OptionsContext *o, const char *filename)

  #ifdef DEBUG
      av_log(NULL,AV_LOG_INFO,"func :%s(%d) filename :%s \n", __func__,__LINE__,filename) ;
  #endif
      if (!strcmp(filename, "-"))  //after step over,the debug windows show filename=NULL.
  
          filename = "pipe :" ;
  #ifdef DEBUG
  
      av_log(NULL,AV_LOG_INFO,"func :%s(%d) filename :%s \n", __func__,__LINE__,filename) ; 
  
      //but it can print the correct value。
  
  #endif
  

  you can clone the project from https://github.com/daozhao/FFmpeg.git, and checkout branch(release/2.2withComment) which is include xcode project file. you can debug with FFmpegMakefile targets try it.

  you can see the screen record on https://www.youtube.com/watch?v=3rTLirTGPM4 .

  my OS:10.9.2, xcode:5.1.1

• How to install frei0r on FFmepg ?

  26 octobre 2018, par La-Cat

  Sorry for the stupid question, I need some help with installing frei0r with FFmpeg.
  I have already installed FFmpeg by this tutorial :
  Tutorial for installing FFmepg

  When I’m trying to add the frei0r plugin, nothing works.
  I have tried to use this thread and frei0r’s website.

  Thanks :)

• fps is too low when ffmpeg grab video

  6 avril 2014, par zhangyp007

  I use ffmpeg with the following options :

  ffmpeg -f video4linux2 -s 640x480 -r 25 -i /dev/video0 http://localhost:8090/feed1.ffm

  All I want to do is to watch the web live video in my chrome browser. This is relevant part in my ffserver.conf file :

  <stream>              # Output stream URL definition
  
     Feed feed1.ffm              # Feed from which to receive video
  
     Format webm
  
     NoAudio
  
      #Audio settings
  
     #AudioCodec vorbis
  
     #AudioBitRate 64             # Audio bitrate
  
  
  
     # Video settings
  
     VideoCodec libvpx            
  
     VideoSize 720*576           # Video resolution 
  
     VideoFrameRate 25           # Video FPS
  
     AVOptionVideo flags +global_header  # Parameters passed to encoder
  
                                         # (same as ffmpeg command-line parameters)
  
     AVOptionVideo cpu-used 0
  
     AVOptionVideo qmin 10
  
     AVOptionVideo qmax 42
  
     AVOptionVideo quality good
  
     AVOptionAudio flags +global_header
  
     PreRoll 15
  
     StartSendOnKey
  
     VideoBitRate 400            # Video bitrate
  
  </stream>

  When I open chrome to the following location :

  http://localhost:8090/test.webm

  I can successfully watch the live video, but due to a low fps, I just doesn't produce a fluent video. I found out that the fps is only around 6. Sometimes it goes up to around 10 or 15. When that is the case, the becomes video a bit more fluent.

  I have set the fps to 25, so I wonder why it actually gets to the low fps reate.