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• How do I make Ffmpeg work for subtitles in flutter ?

  19 juillet 2024, par Mohammed Bekele

  I'm trying to burn subtitles in a video. I'm going to show you the manual command I used :

  


  String newCmd =
          '-i /storage/emulated/0/ffmpeg/video.avi -vf subtitles=\'/storage/emulated/0/ffmpeg/caption.srt\':force_style=\'Fontsize=24\' /storage/emulated/0/ffmpeg/apt.mp4';
      


  


  When I use the above command it just fail, but the following code works.

  


   String newCmd =
          '-i /storage/emulated/0/ffmpeg/video.avi /storage/emulated/0/ffmpeg/apt.mp4';


  


  When I run ffmpeg on my pc this is the command

  


  ffmpeg -i F:\ffmpeg\video.avi -vf subtitles='F\:\\ffmpeg\\caption.srt':force_style='Fontsize=24' F:\ffmpeg\new.mp4


  


  So when using in subtitles we need to provide extra backslashes to the paths. So does this mean Flutter expects the same ? Or should I have to include a font file to it ?

  


  I'm using ffmpeg_kit_flutter package.

  


• How can I overlay multiple images with fade-in using ffmpeg ? [closed]

  2 juin 2024, par strangerD

  In the working folder, there are
text1.png
text2.png
video.mp4
(all sizes 400x400)

  


  I would like to overlay
text1 and text2
on this video.mp4 while fading them in.

  


  If it was just one image, I could make it with the code below,
so I am currently researching ways to improve the code below.
ffmpeg -i video.mp4 -loop 1 -i text1.png -filter_complex "[1]fade=in:st=2:d=1:alpha=1[i];[0][i]overlay=x=0:y=0:shortest=1;" output.mp4

  


  Below is the code I created based on the manual and information I found on Google.
ffmpeg -i video.mp4 -loop -i text1.png -i text2.png -filter_complex "[1]fade=in:st=2:d=1[i];[2]fade=in:st=2:d=1[y];[0][i]overlay=x=0:y=0:shortest=1[v1];[v1][y]overlay=x=0:y=0[v2]" -map "[v2]" output.mp4

  


  However, this will result in an error message
Invalid file index 2 in filtergraph description
and the second image will be invalid.

  


  How can I improve the overlay of two images ?

  


• SNAP : Simulation and Neuroscience Application Platform [closed]

  19 avril 2024, par S_S

  Is there any documentation/help manual on how to use SNAP (Simulation and Neuroscience Application Platform)1.

  



  I wanted to run the Motor Imagery sample scenario with a .avi file for the stimulus instead of the image. How can that be done ?

  



  The following error is obtained when using the AlphaCalibration scenario which gives code to play an avi file.Any help appreciated

  



  :movies:ffmpeg(warning): parser not found for codec indeo4, packets or times may be invalid.
:movies:ffmpeg(warning): max_analyze_duration 5000000 reached at 5000000
:movies(error): Could not open /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:audio(error): Cannot open file: /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:audio(error): Could not open audio /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:movies:ffmpeg(warning): parser not found for codec indeo4, packets or times may be invalid.
:movies:ffmpeg(warning): max_analyze_duration 5000000 reached at 5000000
:movies(error): Could not open /e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi
:gobj(error): Texture "/e/BCI_Feb2014/SNAP-master/src/studies/SampleStudy/bird.avi" exists but cannot be read.
Traceback (most recent call last):
  File "E:\BCI_Feb2014\SNAP-master\src\framework\latentmodule.py", line 458, in _run_wrap
    self.run()
  File "modules\BCI\AlphaCalibration.py", line 30, in run
Exception during run():
    m = self.movie(self.moviefile, block=False, scale=[0.7,0.4],aspect=1.125,contentoffset=[0,0],volume=0.3,timeoffset=self.begintime+t*self.awake_duration,looping=True)
Could not load texture: bird.avi
  File "E:\BCI_Feb2014\SNAP-master\src\framework\basicstimuli.py", line 348, in movie
    tex = self._engine.base.loader.loadTexture(filename)
  File "E:\BCI_Feb2014\Panda3D-1.8.0\direct\showbase\Loader.py", line 554, in loadTexture
    raise IOError, message
IOError: Could not load texture: bird.avi