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• Problem with processing FFMPEG video , the output video is totally black in first 3 seconds

  13 janvier 2021, par Trần Minh Tuấn

  I want to make a slideshow by using concat demuxer like this link :
https://trac.ffmpeg.org/wiki/Slideshow

  


  Here is the textfile preinputFiles.txt :

  


  file 'path a'
duration 2
file 'path b'
duration 2
file 'path c'
duration 2
file 'path c'


  


  and my command array is :

  


  String[] cmd = new String[]{
            "-f","concat","-i",
            textFile,
            "-vsync", "vfr", "-pix_fmt", "yuv420p",
            dest.getAbsolutePath()};


  


  the video has 3 seconds that it is totally black and run from 3s to 9s even the gallery shows that it is a 6 seconds long video .

  


  Thanks for the help !

  


• ffmpeg x11grab inputting improperly

  20 décembre 2017, par Not a superuser

  I have the stock ffmpeg install from the xbps repository. I’ve used it before, but am on a new system.

  Running "ffmpeg x11grab -video_size 1280x800 -framerate 60 -i $DISPLAY output.mkv" yeilds no errors, but when I watch the video it is a mess switching between workspaces and with only partly rendered programs.

  Taking other inputs such as webcam work fine, and different encoding methods don’t change anything (though webm flat out doesn’t work, but that’s not a problem for me).

  I’ve tried what’s here : https://wiki.archlinux.org/index.php/FFmpeg

  Only other thing to note is that I use i3 as a dm, which shouldn’t be a problem, but figured I’d state it just in case.

  EDIT :
  I was using compton for composite, and that was where my issue lied...
  https://github.com/chjj/compton/issues/381

  Thanks !

• How to pass options to ffmpeg from SoX ?

  8 octobre 2012, par beardedlinuxgeek

  I'm trying to combine and encode some files from wav to m4a. I installed both ffmpeg and sox from source to make sure nothing was disabled. When I do the conversion with ffmpeg

  ffmpeg -i input.wav -acodec aac -strict experimental output.m4a

  it works fine. When I use SoX

  sox input.wav output.m4a

  I get the error

  [NULL @ 0x251b4e0] Codec is experimental but experimental codecs are not enabled, see -strict -2
  
  sox FAIL ffmpeg: ffmpeg could not open CODEC
  
  sox FAIL formats: can't open output file `output.m4a':

  I need to way to get SoX to tell ffmpeg that its ok to use the experimental codecs.

  Also I already tried using this guide http://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide to install the fdk-acc encoder, but it didn't work. The experimental one works fine so I'd rather just use that.