Newest 'ffmpeg' Questions - Stack Overflow

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• Ffmpeg, drop UDP packet by lenght

  6 juin 2017, par Red5goahead

  According to this post about these HDMI sender with HDbitT protocol (LENKENG , ESYNic ecc.)

  there is a problem with FFMpeg.

  The HDMI sender broadcast an UDP multicast MPEG-TS stream that can used with vlc but it doesn't work with ffmpeg that can't recognize the stream.

  (I solved the problem using VLC as a UDP-HTTP proxy, with http ffmpeg work fine)

  [mpegts @ 029c2b00] probed stream 1 failed [mpegts @ 029c2b00] Could not find codec parameters for stream 1 (Unknown: none): unknown codec Consider increasing the value for the ‘analyzeduration’ and ‘probesize’ options

  An issue, the most important one, is this stream contain a lots of UDP zero lenght packet .

  It would be fine if FFMPEG could avoid these packets. In Windows desktop system, firewall don't allow to drop them out.

• How to stitch two video with FFmpeg in Android ?

  6 juin 2017, par xiaoluo

  There are two video, I want to stitch them with FFmpeg in Android likes the following picture, does any one can help me or give me some advice?Thanks!

  One video on left, the other on right

• FFMPEG set -ss and -to with string

  6 juin 2017, par NewUser

  I know I can set the start with -ss and end with -to but can someone please help me to format the following so that I can enter the -ss and -to with a string?

  I want -ss to come from

  String start = editStart.getText().toString();
  

  and -to to come from

  String end = editEnd.getText().toString();
  

  Here is my ffmpeg string I want to edit, I have entered -ss and -to to show where I want the above strings to be.

  String s = "-i" + " " + mVideoUri.toString().replace("file:///", "") + " -filter_complex [1:v][0:v]scale2ref=iw:ih[ovr][base];[ovr]colorchannelmixer=aa=0.7[ovrl];[base][ovrl]overlay[v] -ss -to -map [v]" + directoryToStore + "/" + FileName + mp4;
  
  String[] arguments = s.split(" ");
  
  ExecuteFFMPEG(arguments);
  

• Running PowerShell command in Universal Windows Platform C#

  6 juin 2017, par stephen

  So I am trying to write a basic application to cut and export a subsection of a video. I have come across (and decided to use) the FFMPEG command line tools to do the cropping. This seemed straight forward (https://stackoverflow.com/a/5047426/6728859), but Universal Windows apps do not support System.Diagnostics.Process. Instead, it was suggested that they do support Powershell, which means I could do it by following (https://blogs.msdn.microsoft.com/kebab/2014/04/28/executing-powershell-scripts-from-c/). However, I get the following errors

  Cannot find type System.SystemException in module CommonLanguageRuntimeLibrary

  Cannot resolve Assembly or Windows Metadata file 'System.Configuration.Install.dll'

  From my limited understanding System.SystemException was removed in UWP, and I'm not sure where to find System.Configuration.Install.dll.

  Now to get PowerShell I had to include System.Management.Automation which I got from C:\Program Files (x86)\Reference Assemblies\Microsoft\WindowsPowerShell\3.0 which doesn't seem correct to me, but I could be wrong.

  Is it possible to run commands in a UWP, or does anyone have any suggestions?

• Building OpenCV for macOS with ffmpeg

  6 juin 2017, par rudyryk

  I'm trying to build OpenCV library for macOS with build_framework.py script like this:

  platforms/osx/build_framework.py osx
  

  What I noticed is that ffmpeg is not detected while configuring build with CMake:

  -- Can't find ffmpeg - 'pkg-config' utility is missing
  

  That's looking strange, because I have both ffmpeg and pkg-config installed via Homebrew.

  Finally, I noticed in CMakeLists.txt the following line:

  if(NOT APPLE_FRAMEWORK)
     find_package(PkgConfig QUIET)
  endif()
  

  Why is it present in the first place?

  Seems like when I remove the if(NOT APPLE_FRAMEWORK) condition it runs successfully and configures build with ffmpeg enabled.