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• FFMPEG Flutter : attaching captions to a video issue

  24 juillet 2024, par Aqib Javed

  I am working on an app where i first extract audio from a video, then transcribe it and then i wanna attach that transcribed captions or subtitles to the original video.

  


  Everything is working smooth except the subtitles attaching part
if im running the FFMPEG command directly in terminal, it works fine but not in flutter

  


  here is my code of attaching the subtitles to the video :

  


   Future<void> attachCaptionsToVideo(DeepGramResponse deepGramResponse) async {&#xA;    var tempDir = await getTemporaryDirectory();&#xA;&#xA;    final outputPath = "${tempDir.path}/outputWithCaptions.mp4";&#xA;    final String subtitlePath = deepGramResponse.captionsPath&#xA;        .replaceAll(&#x27;\\&#x27;, &#x27;\\\\&#x27;)&#xA;        .replaceAll(&#x27; &#x27;, &#x27;\\ &#x27;);&#xA;    final String command =&#xA;        &#x27;-y -i ${deepGramResponse.videoPath} -vf subtitles=$subtitlePath $outputPath&#x27;;&#xA;    await FFmpegKit.executeAsync(command, (session) async {&#xA;      final returnCode = await session.getReturnCode();&#xA;      final output = await session.getOutput();&#xA;      final error = await session.getFailStackTrace();&#xA;&#xA;      log(&#x27;FFmpeg command executed with return code: $returnCode&#x27;);&#xA;      if (ReturnCode.isSuccess(returnCode)) {&#xA;        log(&#x27;Captions attached successfully&#x27;);&#xA;        deepGramResponse.copyWith(&#xA;          videoPath: outputPath,&#xA;        );&#xA;        Get.to(() => VideoPlayerScreen(videoPath: outputPath));&#xA;      } else {&#xA;        log(&#x27;FFmpeg command failed&#x27;);&#xA;        log(&#x27;Error output: $output&#x27;);&#xA;        log(&#x27;Error details: $error&#x27;);&#xA;        Fluttertoast.showToast(&#xA;            msg: &#x27;Something went wrong, please try again later&#x27;);&#xA;      }&#xA;    });&#xA;  }&#xA;</void>

  


  here is the error im getting :

  


  


  [AVFilterGraph @ 0x7b8a3f35f0] No option name near
'/data/user/0/com.example.blink/app_flutter/captions.srt'
[AVFilterGraph @ 0x7b8a3f35f0] Error parsing a filter description around :
[AVFilterGraph @ 0x7b8a3f35f0] Error parsing filterchain 'subtitles=/data/user/0/com.example.blink/app_flutter/captions.srt'
around :
Error reinitializing filters !
Failed to inject frame into filter network : Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed !

  


  


• Overlaying video with ffmpeg

  11 novembre 2012, par elee

  I'm attempting to write a script that will merge 2 separate video files into 1 wider one, in which both videos play back simultaneously. I have it mostly figured out, but when I view the final output, the video that I'm overlaying is extremely slow.

  Here's what I'm doing :

  1. Expand the left video to the final video dimensions

     ffmpeg -i left.avi -vf "pad=640:240:0:0:black" left_wide.avi

  2. Overlay the right video on top of the left one

     ffmpeg -i left_wide.avi -vf "movie=right.avi [mv] ; [in][mv] overlay=320:0" combined_video.avi

  In the resulting video, the playback on the right video is about half the speed of the left video. Any idea how I can get these files to sync up ?

• FFMPEG not creating thumbnails

  12 juin 2016, par MixedVeg

  My ffmpeg command in php is

  echo $cmd_thumbnail_create = ("\"$ffmpeg\" -i \"" . $dir.$videopath . "\" -an -ss $getFromSecond \"" . $dir.$thumbnailpath ."\"");
  
  exec($cmd_thumbnail_create);

  Output of which is

  "C :\FFMPEG\bin\ffmpeg" -i "C :/xampp/htdocs/final/uploaded_videos/intro_en.mp4" -an -ss 6 "C :/xampp/htdocs/final/thumbnail/intro_en.jpg"

  This when copied and executed on the command prompt creates the thumbnail at proper location with proper name.

  Any suggestions ?