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• Android FFmpeg cant set quality of image

  24 octobre 2017, par TheOtherguyz4kj

  I am working with FFmpeg on Android, I am trying to extract frames from a video every second. I made this command that works well :

  final String cmd[] = {
  
  
  
              "-i",
  
              videoPath,
  
              "-vf",
  
              "fps=1",
  
              mediaStorageDir.getAbsolutePath() +
  
              "out%d.png"
  
      };

  Now I want to reduce the quality of the extracted frames so I tried this but get the error :

  final String cmd[] = {
  
  
  
              "-i",
  
              videoPath,
  
              "-vf",
  
              "fps=1",
  
              "-qscale:v 12",
  
              mediaStorageDir.getAbsolutePath() +
  
              "out%d.png"
  
      };

  At least one output file must be specified

  What is the problem ? I have searched online a lot and cant find a solution to the problem, also is there a better way to reduce the quality of my extracted frames ?

  thanks

• Using FFProbe within a Python script

  25 janvier 2017, par mattp341

  I am fairly new to python, this is my first real project and I have come to a roadblock. What I have here is a .wmv file, I am using FFprobe to extract the duration in seconds from the .wmv file. When I run the following command in the CMD :

  ffprobe -i Video2.wmv -show_entries format=duration -v quiet -of csv="p=0"

  I get successful output.

  However, when I use os.system, like this :

  os.system('ffprobe -i Video2.wmv -show_entries format=duration -v quiet -of csv="p=0"')

  I get the following output :

  'ffprobe' is not recognized as an internal or external command, operable program or batch file.

  This is very confusing and I haven’t been able to find a fix to this exact problem online, any input would be very much appreciated.

• Is it possible to adjust the timeout for ffmpeg on SDP ?

  1er avril 2021, par user3474565

  I have rtpdump files that I would like to be able to convert to webm or mp4 on demand and on the fly. To do this, I'm streaming their packets out extremely rapidly and having ffmpeg read them in using an SDP file. The packets come through and are transcoded in a second or two, since the videos are fairly short. But then there is an additional 10-second wait afterward because the ffmpeg network timeout for SDP defaults to 10 seconds ; I'd like to reduce it. Unfortunately, the -timeout and -stimeout options don't seem to be available when I'm using -i with an SDP file (I get -timeout option not found).

  


  I looked around online, and it seems that 6 or 7 years ago people were having similar issues and some people made pull requests into FFmpeg to add this as an option for RSTP and SDP. I know this went through for RSTP because it's in the documentation know ; did anything ever happen with SDP ? Is it possible for me to set this option, or maybe to terminate ffmpeg manually when I know the stream is done ?