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• Segmenting a video and adding text that differs in each segment [FFMPEG]

  31 octobre 2023, par Kal-Toh

  I have a folder full of videos I want to segment, resize and add text to. So far I've managed to segment and resize them.

  


  I'm trying to add text in a TikTok Style : [Kind of like][1] this but black text in a white background. (If that isn't possible, I'd be fine with just white text).

  


  I already have the font file(.oft file type, is that ok or does it need to be .ttf ?)
The video is being converted to 720x1280 (9:16) and I'd like the text to display at the top centre of the video, taking up roughly the top 25%.

  


  Further to this, and this is where I'm having trouble understanding the process :

  


  I'd like text at the bottom of the video in the same style, that would change each segment.

  


  For example :

  


  I have a 10 minute long video. I want to split this video into 60 second segments. Each segment will have a title (the same across each segment) and a sub title at the bottom that would differ for each segment (for example 'Part 1/10', 'Part 2/10' etc)

  


  I know I could run one command to segment each video, add the title and change the aspect ratio and a second command to add the bottom text, feeding in a variable based on the number of mp4 files in the folder, however that doesn't seem like the most efficient process. Is there a way to do this all in one command ?

  


  This is the command I'm using so far :

  


  ffmpeg_command = [
            'ffmpeg',
            '-i', os.path.join(input_folder, video_file),
            '-vf', f'scale=720:1280:force_original_aspect_ratio=decrease,pad=720:1280:(ow-iw)/2:(oh-ih)/2
            ,drawtext=text=\'{text}\':x=(w-tw)/2:y=(h/4)-th:fontsize=24:fontfile={font_path}:fontcolor=black:box=1:boxcolor=white',
            '-threads', '100',
            "-c:a", "copy",
            '-t', str(duration),
            '-segment_time', '160',  # 3 minutes
            '-reset_timestamps', '1',
            '-f', 'segment',
            os.path.join(output_subfolder, f'{video_name}_%03d.mp4')
        ]


  


  Although not styled the way I want it to be, it's a decent start and all else works fine.

  


  It's just the bottom text I can't figure.
[1] : https://i.insider.com/61aa608a983f360019c854a5?width=1300&format=jpeg&auto=webp

  


• avcodec/dovi_rpu : fix dm_metadata_id handling

  9 juin 2024, par Niklas Haas

  avcodec/dovi_rpu : fix dm_metadata_id handling
  Despite the suggestive size limits, this metadata ID has nothing to do
  
  with the VDR metadata ID used for the data mappings. Actually, the
  
  specification leaves them wholly unexplained, other than acknowleding
  
  their existence. Must be some secret dolby sauce. They're not even
  
  involved in DM metadata compression, which is handled using an entirely
  
  separate ID.
  That leaves us with a lack of anything sensible to do with these IDs.
  
  Since we unfortunately only expose one `dm_metadata_id` field to the
  
  user, just ensure that they match ; which appears to always be the case
  
  in practice. If somebody ever hits this error, I would really much
  
  rather like to see the triggering file.
  

  • [DH] libavcodec/dovi_rpu.c
  • [DH] libavcodec/dovi_rpu.h
  • [DH] libavcodec/dovi_rpudec.c
  • [DH] libavcodec/dovi_rpuenc.c

• 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)
    }
}