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• Could not resolve com.android.tools.build:gradle:4.0.1

  9 juillet 2021, par AKclown

  when I installed react-native-ffmpeg and executed react-native run-android, the following error was reported


  


  I used the newly created react native project. When I haven’t installed this package, everything is normal.
Unfortunately, when I installed this package without any operation, I got an error.
Can you give me some suggestions？

  


  Expected behavior
react-native run-android success

  


  Current behavior
react-native run-android failed

  


  Screenshots
This is all my dependencies, this is the new start of react native


  


  Environment
"react" : "17.0.1",
"react-native" : "0.64.2",
"react-native-ffmpeg" : "^0.5.1"

  


  Please give me some suggestions, thank you very much, it has troubled me for a long time

  


• "fixing" RTL texts from logical to visual, before embedding in video as subtitles with ffmpeg

  13 mai 2024, par Berry Tsakala

  I'm searching for the correct way to pre-process my subtitles files before hard-coding them into video clips.

  


  Currently, ffmpeg does not process RTL (right-to-left) languges properly ; I have detailed the problem here :
https://superuser.com/questions/1679536/how-to-embed-rtl-subtitles-in-a-video-hebrew-arabic-with-the-correct-lan

  


  However, there could be 2 programmatic solutions :

  


  

  1. adding certain unicode control characters can fix (or partially fix) the text, which is then fed into ffmpeg, giving good results.

  


  


  

  • character 0x200F at the end of a hebrew clause, after punctuation

  


  • character 0x202B, I haven't yet learned its usage.

  


  


  

  2. I can edit the text so that it will produce the correct results on ffmpeg.
But that requires smart BiDi algorithm.

  


  


  Do you know how to preprocess such text ?

  


  (this is NOT an encoding question. It is about RTL/LTR algorithm to use.)

  


  Thank you

  


• How can I add a background image while combining *.png files using ffmpeg

  12 février 2023, par Walt Howard

  I'd like to add a background image while combining *.png files to make an mp4 file, using ffmpeg.

  


  Currently, I have to first create an animated gif using imagemagick convert, like this :

  


  convert -delay ${DELAY} -dispose Background *.png -coalesce null: ${BACKGROUND} -compose dstOver -layers composite -layers optimize -loop 0 planet.gif


  


  Then I process that animated gif using ffmpeg to optimize it :

  


  ffmpeg -i planet.gif -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" planet.mp4


  


  Which sort of works, but is slow and has a problem. I craps out if I go above about 100 input files, and creates animated gifs that are basically just white screens.

  


  ffmpeg alone works great, and 100 times faster stitching the *.png files together

  


  ffmpeg -framerate 10 -pattern_type glob -i '*.png' -movflags faststart -pix_fmt yuv420p -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" planet.mp4

  


  But, no background there. I haven't found anyway to add that background. Does ffmpeg even support such a thing ?