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• React Native and FFMPEG render text differently (Help me)

  6 février 2021, par Douglas Gondim

  I'm creating a video editing app in React Native that allows you to burn subtitles onto any video. I'm facing a problem that the font size on the phone screen doesn't match the font size after the video is rendered.

  


  I can guarantee that the text is being scaled down appropriately on the app side because the video obviously looks smaller on the phone screen than its original size. So the text that I'm placing on top of the video as a preview needs to be scaled down accordingly.

  


  The problem is each different font seems to have a different scale factor when I render the video. So the previewer is ALWAYS off. My solution was to manually scale up/down each font in regards to its approximate width and height factor. But that's a very poor solution.

  


  I assume it has something to do with something called a font.config file that you can set on ffmpeg.

  


  How can I make eg. Arial, 14 in React Native be rendered the same way as Arial, 14 on ffmpeg ? I really need help with that. I don't even know where to look.

  


• Smart y coordinate to make vertical alignment for the text with typewriting effect

  31 août 2021, par Макс Шульдинер

  I'm doing animation for the typewriting effect. Here is my ffmpeg string :

  


  -i ffmpeg_inputs/output-onlinegiftools.gif  -vf "[in]drawtext=fonts/RobotoMono-Regular.ttf:text='h':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+0:y=h-th-400:enable='between(t,0.00, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'i':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+25:y=h-th-400:enable='between(t,0.80, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'g':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+75:y=h-th-400:enable='between(t,1.60, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'u':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+100:y=h-th-400:enable='between(t,2.40, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 'y':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+125:y=h-th-400:enable='between(t,3.20, 7.80)', drawtext =fonts/RobotoMono-Regular.ttf:text = 's':fontcolor=orange:fontsize=35:x=(w-text_w)/2-200+150:y=h-th-400:enable='between(t,4.00, 7.80)'[out]" ffmpeg_outputs/test2.gif -y 


  


  Here is the results with different y values :

  


  

  


  

  


  As i understand, to make smooth sentence, for some letters i need top vertical alignment, and for others i need bottom vertical alignment. How can i make this "smart alignment", or the only one method is to hardcode y values for different letters ?

  


• how i can save overlay text box with a video in gallery by using ffmpeg ?

  10 septembre 2024, par Umair Manzoor

  final escapedOverlayText = overlayText.replaceAll(''', '\'') ;
final command =
'-i $videoPath -vf "drawtext=text='$escapedOverlayText':x=10:y=10:fontsize=24:fontcolor=white" -c:a copy $outputPath' ;

  


    print('Executing command: $command');

  final session = await FFmpegKit.execute(command);
  final returnCode = await session.getReturnCode();
  print('here is errror Return code: $returnCode');


  


  that those section of code where this ffmpeg returns the following error
I/flutter ( 6329) : here is errror Return code : 1
I/flutter ( 6329) : FFmpeg failed with return code : 1

  


  i am trying to save the video with overlay text data in the gallery.