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• How to prevent overwriting fifo while playing local file with ffmpeg ?

  21 juillet 2013, par frankish

  I use av_read_frame() to read and push frames to fifo. In another thread, I read from this fifo. So, reading and writing does not interfere that much.

  However, I found out that when playing from a local file, audio suddenly skips to somewhere else.. I tried to open recorded file with VLC player and it worked. So the file(recording) is not broken.

  I tried (just to see if it works) the following and it works but it has other problems.

  ...
  
  if(localFile){
  
      while(av_fifo_size(fifoPlayback)>2000000){
  
          pthread_mutex_unlock(&fifoPlaybackMutex);
  
          usleep(1000000);
  
          pthread_mutex_lock(&fifoPlaybackMutex);
  
          // Waiting before writing to fifo, it's not empty enough");
  
      }
  
  }
  
  
  
  av_fifo_generic_write(fifoPlayback,...)

  Since the above block at least does not skip, I think my problem is really overwriting on the fifo. But how should I correctly manage this situation ?

• arm : use a local label instead of the function symbol in ff_prefetch_arm

  20 juillet 2015, par Janne Grunau

  arm : use a local label instead of the function symbol in ff_prefetch_arm
  Avoids a relocation which might end out of range for thumb2.
  Reported-By : Ludovic Fauvet <etix@videolan.org>
  
  Bug-Id : https://bugs.webkit.org/show_bug.cgi?id=137022
  
  CC : libav-stable@libav.org
  

  • [DBH] libavcodec/arm/videodsp_armv5te.S

• Cutting the stream on local date time when scheduled

  19 juin 2017, par Fearhunter

  I am using a ffmpeg slice commando in my C# code. For example : I scheduled a stream from 12pm till 3 pm. In my if statement I use a condition to compare the local datetime with the time of now.

   DateTime systemDate = DateTime.Now;
  
   DateTime compareDate = DateTime.Today;
  
  
  
    private Process SliceStream(string url)
  
          {
  
              if (systemDate < compareDate)
  
              {
  
                  return Process.Start(new ProcessStartInfo
  
                  {
  
                      FileName = "ffmpeg.exe",
  
                      Arguments = $"-i \"{url}\"-acodec aac -strict -2 -vcodec libx264 -hls_wrap 100 -f hls -hls_time 20 C:/var/1.m3u8 ",
  
                      UseShellExecute = false,
  
                      RedirectStandardOutput = true
  
  
  
                  });
  
              }
  
              else
  
              {
  
                  Thread.Sleep(100);
  
                  return null;
  
              }
  
          }

  The problem is it doesn’t work when my time on my computer is for example 12pm and he is not cutting the stream.

  What am I doing wrong ?