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• C# Problem Reading Console Output to string

  25 septembre 2012, par MoreThanChaos

  i want to launch ffmpeg from my app and retrive all console output that ffmpeg produces. Thing seems obvious, i followed many forum threads/articles like this one but i have problem, though i follow all information included there I seem to end up in dead end.

  String that should contain output from ffmpeg is always empty. I've tried to see where is the problem so i made simple c# console application that only lists all execution parameters that are passed to ffmpeg, just to check if problem is caused by ffmpeg itself. In that case everything work as expected.

  I also did preview console window of my app. When i launch ffmpeg i see all the output in console but the function that should recieve that output for further processing reports that string was empty. When my param-listing app is launched the only thing I see is the expected report from function that gets output.

  So my question is what to do to get ffmpeg output as i intended at first place.

  Thanks in advance
  MTH

• Is there a way to control ffplay audio volume from command line and from key commands on Mac OSX ?

  20 avril 2023, par smartblonde

  We want to use ffplay to monitor live RTMP feeds. We have a script to open an instance of ffplay for each feed. We would like to control the initial volume of the video to be around 30 out of 100. We would also like to be able to raise or lower the volume via key commands during the stream. We are referring to this doc : http://ffmpeg.org/ffplay.html

  



  We've tried the main option -volume 30, to try and start the volume at 30/100. FFplay says unrecognized option when it sees -volume on the command line.

  



  Also, we've tried using 9 and 0 to lower or raise the volume once the player is up and playing the live RTMP feed. These key commands seem to have no effect on the player's volume.

  



  Are there other shell parameters, and other key commands, that are known to work on all builds/OS's for ffplay ? If not, why change these basic functions from release and O/S ato other release ? In any case what works on MacOSX ? Thank you !

  


• libfdk-aacdec : Enable Dynamic Range Control Metadata Support

  14 octobre 2014, par Omer Osman

  libfdk-aacdec : Enable Dynamic Range Control Metadata Support
  For streams which contain DRC metadata, the FDK decoder is able to
  
  control rendering of the decoded output. The rendering parameters
  
  are detailed in fdk_aac_dec_options [].
  The default behavior is left up to the decoder.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/libfdk-aacdec.c
  • [DH] libavcodec/version.h