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• Runtime.exec() freezes on execution of ffmpeg Audio-replacing command that works in windows console

  17 février 2024, par Finn Andre Worm

  I have been building an application to merge together videos based on data I got from the web. I was lucky enough to find this great tool ffmpeg that has saved me a lot of time and effort, but unfortunately I seem to be stuck on the following issue :

  


  Im attempting to execute a command for merging a video with audio (in the future I will also be adding hardcoded .ASS subtitles and .PNG images).
My application dynamically generates me a command based on the files its suppposed to use which works just as intended, as the command that I get works inside of my windows console (cmd).
But when I try to run it through my Java application, the code seems to "freeze" permanently and while the placeholder file gets created on my desktop with the filename and correct file format, it just has the default windows video icon and cant be opened (as it has not finished being created, duh).
Im also using Eclipse, perhaps thats worth noting.

  


  This is the part of the code where it freezes :

  


  protected void runFFMPEG(Multimap args, String outputFile, String fileFormat) throws IOException
{
    try
    {
        Runtime.getRuntime().exec(setCommand(args, outputFile, fileFormat)).waitFor();
    }
    catch (InterruptedException e)
    {
        e.printStackTrace();
    }
}


  


  as previously said, the command itself is generated correctly, but heres the code nonetheless :

  


  private String[] setCommand(Multimap args, String outputFile, String fileFormat)
{
    String[] command = new String[args.size()*2+2];
    command[0] = ffmpegLocation;
    int[] i = new int[1];
    i[0] = 1;
    args.forEach((key, value) -> { 
        command[i[0]++] = key;
        command[i[0]++] = value;
    });
    command[i[0]] = outputFile + fileFormat;
    return command;
}


  


  Note : I used a normal string previously for command, but I saw another thread saying that using an array instead fixxed their issue (which it didnt for me, else i wouldnt be here...).

  


  This is an example command that gets generated :

  


  ffmpeg.exe -ss 00:00:00 -to 00:00:15 -i C :\Users\Test.mp4 -i C :\Users\FINAL.mp3 -map 0 -map 1:a -c:v copy C :/Users/User/TestVideo.mp4

  


  I also have a different command that concats the audio together into one FINAL.mp3 file, so its not like ffmpeg entirely fails to work in my application.
My guess is that it has something to do with the Runtime i get with Runtime.getRunTime(), but I cant seem to find out what the problem is.
Can someone tell me what I did wrong ? Thanks in advance !

  


• lavfi : add ICC profile support via lcms2

  9 avril 2022, par Niklas Haas

  lavfi : add ICC profile support via lcms2
  This introduces an optional dependency on lcms2 into FFmpeg. lcms2 is a
  
  widely used library for ICC profile handling, which apart from being
  
  used in almost all major image processing programs and video players,
  
  has also been deployed in browsers. As such, it's both widely available
  
  and well-tested.
  Add a few helpers to cover our major use cases. This commit merely
  
  introduces the helpers (and configure check), even though nothing uses
  
  them yet.
  It's worth pointing out that the reason the cmsToneCurves for each
  
  AVCOL_TRC are cached inside the context, is because constructing a
  
  cmsToneCurve requires evaluating the curve at 4096 (by default) grid
  
  points and constructing a LUT. So, we ideally only want to do this once
  
  per curve. This matters for e.g. ff_icc_profile_detect_transfer, which
  
  essentially compares a profile against all of these generated LUTs.
  
  Re-generating the LUTs for every iteration would be unnecessarily
  
  wasteful.
  The same consideration does not apply to e.g. cmsCreate*Profile, which
  
  is a very lightweight operation just involving struct allocation and
  
  setting a few pointers.
  The cutoff value of 0.01 was determined by experimentation. The lowest
  
  "false positive" delta I saw in practice was 0.13, and the largest
  
  "false negative" delta was 0.0008. So a value of 0.01 sits comfortaby
  
  almost exactly in the middle.
  Signed-off-by : Niklas Haas <git@haasn.dev>
  

  • [DH] configure
  • [DH] libavfilter/fflcms2.c
  • [DH] libavfilter/fflcms2.h

• How to use Visual Studio Compiled libs with MSYS pkg-config

  18 août 2017, par maxhap

  First a bit of background.

  I’m trying to compile ffmpeg on windows with the libass extensions/configuration option.

  Using the visual studio project libass-msvc I built libass using Visual Studio as a static lib.

  I then installed MinGW with MSYS and pkg-config. Following the instructions on the ffmpeg MSVC installation guide I configured the environment to build with the MSVC linker and to build in x64.

  When I try to configure libass for compilation using ./configure —enable-libass —toolchain=msvc I get the following error in the log file :

  File not found ass/ass.h
  
  pkg-config can not find libass

  I have tried the following to fix this.

  1. Create a .pc file for libass and add this to the PKG_CONFIG_PATH environment variable. See file content below. (After doing this pkg-config libass —version prints 0.81, not the right version number but at least something.)

  2. Copy libass .h files into a MinGW/include/ass folder and the .lib file into the MinGW/libs folder.

  3. Add libass include and bin folders to PATH environment variable

  4. Download libass and dependencies source then try to build it using MSYS with MSVC compiler. My aim here was to be able to use "make install" and let MinGW install libass to the correct locations. After hours of trying to fix linker errors, I abandoned this idea as some of the libass dependencies make files only work with the GCC GNU compiler.

  5. Compile libass with GCC GNU using MinGW make/make install then try and install libass using the GNU libs. Again this led to linker errors (I know this was a bad idea but was worth a try).

  6. Tried using extra lib and include build configuration options —extra-cflags="ffmpeg-dir/extra/include" \
     — extra-ldflags="ffmped-dir/extra/ffmpeg_build/lib" then adding the libs and .h files into those locations

  .pc file

  libass.pc:
  
  prefix=/MinGW
  
  includedir=libass-directory/include
  
  libdir=libass-director/x64/bin/
  
  
  
  Name: libass
  
  Description: Libass project
  
  Version: 0.13.7

  I am now completely stuck and out of ideas if anyone could give any insight or suggestions into what I’m doing wrong that would be fantastic.

  Thanks in advanced !