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• How to extract video embedded subtitle from a video URL and show in a text widget in flutter ?

  24 mars 2024, par badshah badmas

  I'm using flutter VLC player to play videos in my flutter app. I want to change the subtitle size dynamically in my video. But Flutter VLC player did not provide the function to change subtitle size dynamically. So I would like to extract the subtitle from the video and show it in a text widget instead of VLC player's subtitle. Can someone help me to extract the subtitle from the video URL ? Or any other method to solve this issue ?

  


  I have tried to extract subtitles using ffmpegkit .

  


   await FFmpegKit.executeAsync('-i $url -map 0:s:0 -codec:s srt $outputPath');


  


  This code returns a blank srt file.

  


• Gujarati text properly not show on output video using FFmpeg Library in Android

  15 mars 2024, par sanjay dangar

  Gujarati text overly on video using FFmpeg Library on Android

  


  below my code in Gujarati text twin word proper does not show

  


  I am Enter this text ="વડાપ્રધાનશ્રી નરેન્દ્રભાઇ મોદી." but output video in proper not show

  


   fun addFrame2VideoEditFun(&#xA;        videoPath: String,&#xA;        fontPath: String,&#xA;        outputPath: String&#xA;    ): Array<string> {&#xA;        val inputs: ArrayList<string> = ArrayList()&#xA;     var textFile = "વડાપ્રધાનશ્રી નરેન્દ્રભાઇ મોદી."&#xA;        inputs.apply {&#xA;            add("-i")&#xA;            add(videoPath)&#xA;            add("-vf")&#xA;            add("drawtext=fontfile=$fontPath:text=$textFile:fontsize=24:fontcolor=white:x=(w-text_w)/2:y=h-line_h")&#xA;            add("-c:a")&#xA;            add("copy")&#xA;            add(outputPath)&#xA;        }&#xA;        return inputs.toArray(arrayOfNulls(inputs.size))&#xA;    }&#xA;</string></string>

  


  my output video in below text show

  


  

  


  Gujarati text properly does not show on output video using FFmpeg Library.

  


• Show the filename being processed when using an input list and an error occurs ?

  17 février 2024, par GeoNomad

  I am concatenating a large number of short files using a list.

  


  One in a hundred seems to have an error of one sort or another which stops the processing.

  


  


  1. Is there a way to tell ffmpeg to just drop the bad frame or even bad file and continue ?

     


  


  2. If not, is there a way to know what file has the error so I can just remove that file from the list ?

     


  


  


  ffmpeg -safe 0  -f concat -i list.txt -c copy FEEDER.mp4

  


  I have tried -loglevel verbose, but that did not help.

  


  [concat @ 0000022d22b23480] h264_mp4toannexb filter failed to receive output packet
Error demuxing input file 0: Invalid data found when processing input
Terminating demuxer thread 0
list.txt: Invalid data found when processing input


  


  How do I find out which file of the several hundred files in list.txt is the culprit ?

  


  As it happens, these files have time stamps and I can find it by looking at the last output frame and then deleting the appropriate file. But it seems there should be a better way.

  


  FWIW I am working in Windows cmd.exe or Powershell Terminal