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• FFMPEG in Android not rendering Arabic characters

  14 octobre 2024, par Henry Smith

  I have an Android app that uses FFMPEG to add text overlays onto a mp4 video files.

  


  It works fine with a Latin alphabet, but when I try and add Arabic characters as an overlay on the .mp4 file, the output video displays rectangles (assuming unrecognised characters).

  


  FFMPEG command example is :
-y -i video-in.mp4 -preset ultrafast -vf "[in]drawtext=text='نقطة البداية قلا':enable='between(t, 0,5)':fontcolor=White:fontsize=20:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2,drawtext=text='وصلات مزاحجة كبيرة الإزاحة (من ١٢ إلى ٤)':enable='between(t, 15,20)':fontcolor=White:fontsize=20:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2[out]" -r 24 "video-out.mp4"

  


  Output mp4 video comes out a below :
enter image description here

  


  Using Android SDK Version 13, FFMPEG plugin : com.arthenica:mobile-ffmpeg-full-gpl:4.4

  


  Class example code :

  


  import com.arthenica.mobileffmpeg.ExecuteCallback
import com.arthenica.mobileffmpeg.FFmpeg

class VideoUtils() {

    fun addTextOverlay(inputFile: String, outputFile: String, text: String) {
        // create video filter for overlay text between 0 - 5 seconds, centre aligned, white font and black box
        val tempTextString =
            "drawtext=text='$text:enable='between(t, 0,5)':fontcolor=White:fontsize=20:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"

        // create FFMPEG command
        val cmd =
            "-y -i $inputFile -preset ultrafast -vf \"[in]$tempTextString[out]\" -r 24 \"$outputFile\""

        FFmpeg.execute(cmd)
    }
}


  


• FFMPEG : add multiple drawtexts, vertically stacked, to a video

  21 septembre 2020, par Ali Doggaz

  I wish to add several texts to a video. The texts should be vertically aligned, in the top center of the video.
here is what I tried for now :

  


  n = len(titles) #Titles a list containing all the texts we will add to the video
p = 0
for text in titles:
    os.system(
        fr'ffmpeg -i output{p}.mp4 -filter:v drawtext="fontfile=Lato- 
        Black.ttf:fontcolor=black:fontsize=60:text=' + f"'{text}':" + f'y=200-{(n-p) * 62}:x=(w- 
        text_w)/2"-y output{p + 1}.mp4')
    p = p + 1


  


  As you can see, all the texts should have x=(w- text_w)/2 as their abscissa (which is constant ?), but they're never aligned. There is always a sort of padding that pushes the next text added, a bit more to the right.
I also tried to use x=w/2 which is constant and the texts are still not vertically aligned.

  


• FFMPEG filter instances names don't work with "sendcmd" ?

  13 septembre 2023, par VladStepu2001

  I have two drawbox filter instances that I need to animate separately.
  
I've used sendcmd for the one instance already, and it worked fine.

  


  But when I've added the second one, I gave a name to both of them like this :

  


  drawbox@one=0:0:iw:ih:red:fill,drawbox@two=0:0:iw:ih:black:fill


  


  Then, I've tried to use sendcmd like this :

  


  drawbox@one=0:0:iw:ih:red:fill,drawbox@two=0:0:iw:ih:black:fill,
sendcmd=c='0.0-5.0 [expr] drawbox@one w W*(T/5)
           0.0-5.0 [expr] drawbox@two h H*(T/5)'


  


  But that didn't work, the rectangles stayed still.

  


  What I am doing wrong ?