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• How to fix "Cannot find a valid font for the family Sans' while adding text on image using react-native-ffmpeg

  13 mai 2024, par coffee

  I am trying to add text on image using the code below
RNFFmpeg
.execute(`-y -i ${input} -vf "drawtext=text='Hello World':fontcolor=white:fontsize=75:x=0:y=0" ${output}`) ;

  


  I am not using any custom font but still get this error.

  


  Error :

  


  [Parsed_drawtext_0 @ 0x7f87a1ce40] Cannot find a valid font for the family Sans

  


  index.js:115 [AVFilterGraph @ 0x7f6765e760] Error initializing filter 'drawtext'
index.js:115 [AVFilterGraph @ 0x7f6765e760] with args 'text=Hello World:fontcolor=white:fontsize=75:x=0:y=0'
index.js:115 [AVFilterGraph @ 0x7f6765e760]

  


  index.js:115 Error reinitializing filters !

  


  index.js:115 Failed to inject frame into filter network : No such file or directory

  


  index.js:115 Error while processing the decoded data for stream #0:0

  


  Note :

  


  I also tried using a custom font but not able to do it.
When I use RNFFmpegConfig.setFontDirectory('../../assets/fonts') function and with it the following code to add text on image
RNFFmpeg
.execute(`-y -i ${input} -vf "drawtext=text='Hello World':fontfile='../../assets/fonts/MyFont.ttf':fontcolor=white:fontsize=75:x=0:y=0" ${output}`) ;

  


  It gives me the same error.

  


  How can I fix this issue.

  


• Using -itsoffset with AAC Tracks in MP4 : What Actually Happens ? [closed]

  10 avril, par user27607034

  If the frame duration of an AAC file is around 21 milliseconds, does the itsoffset value in the following command actually get applied ? And even if it does, will players like QuickTime or a smart TV actually respect it ?

  


  ffmpeg -itsoffset 0.009 -i input.mp4 \
  -i input.mp4 \
  -map 1:v:0 \ // hevc
  -map 0:a:0 \ // aac
  -c copy \
  output.mp4


  


• Converting png images series to webm with transparent white background from Daz3d

  25 août 2015, par James

  I’m trying to make a webm video with a transparent background from a Daz3D model.
  My process is export png image series with transparent background from Daz3D, use ffmpeg to convert png series to webm video.
  This was working well in Daz3D 4.6.

  But in Daz3D 4.8 the exported background is black instead of white, so when converted to webm is ok on Chrome as has the transparency, but on Firefox is black and has a halo (as Firefox does not support transparency so displays background).

  So I’m looking for a solution with Daz3D, or tools like ImageMagik.
  I almost got it with ImageMagik,

  convert -alpha extract *.png mask.png
  
  mogrify -flatten talk*.png
  
  for /f %x in ('dir /s /b blink*.png') do @composite -compose CopyOpacity mask-0.png %x %x

  But for some reason the final webm has a white background not transparent ...
  Some more info here,

  http://www.daz3d.com/forums/discussion/61237/daz3d-4-8-png-background-is-black

  and here,

  http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=28214

  >
  Doh, okay I figured it out. My images were good, but I somehow have two different versions of ffmpeg on my computer and was using the wrong one that doesn’t seem to support transparency.

  Now it is working.

  My only issue is the last shell line,

  for /f %x in (’dir /s /b blink*.png’) do @composite -compose CopyOpacity mask-0.png %x %x

  This only uses mask-0.png, instead of mask-1 for blink01.png, mask-2 for blink02.png etc.