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• Why does ffmpeg error on the last image in this avi -> jpg conversion ?

  13 avril 2018, par purple_arrows

  I want to make jpeg snapshots of every tenth frame of some avi files. I also want to skip some boring initial content that’s always the same in every avi.

  I’m using the following command :

  ffmpeg -ss SECONDS-TO-SKIP -i video.avi -vf framestep=step=10 images-%03.jpg

  For some files this works fine, but for others I get the following error (where THE-FINAL-NUMBER means I only get this error on what should be the last output image) :

  [image2 @ 0x16fa6c0] Could not open file : images-THE-FINAL-NUMBER.jpg
  
  av_interleaved_write_frame(): Input/output error

  What’s up ? Am I missing some important command line flag ? And how do I fix this ?

  ffmpeg version 2.8.14-0ubuntu0.16.04.1 built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609

• Extremely slow rendering time using Moviepy

  15 janvier 2024, par pacorisas

  I'm trying to create the following : two stacked videos (one on top of each other) with subtitles (like those videos you see in tiktok) from an srt file. For this, I'm first taking the top and bottom video and creating a CompositeVideoClip :

  


  clips_array([[video_clip], [random_bottom_clip]])


  


  Then, I'm taking this CompositeVideoClip and using a generator, creating the SubtitlesClip which then I will add to another CompositeVideoClip :

  


  sub = SubtitlesClip(os.path.join(temp_directory, f"subtitles.srt"), generator)
final = CompositeVideoClip([myvideo, sub.set_position(('center', 'center'))]).set_duration("00:02:40")


  


  Lastly, I'm adding some more text-clips (just an small title for the video) and rendering :

  


  video_with_text = CompositeVideoClip([final] + text_clips)
video_with_text.write_videofile(part_path, fps=30,threads=12,codec="h264_nvenc")


  


  Here is the problem. I tried to render a video of 180 seconds (3 minutes) and the video takes up to hour and a half (80 minutes) which is wild. I tried some render settings as you can see like changing 'codec' and using all the 'threads' of my CPU.
I tried to not use so many CompositeVideoClips, I read that when you concatenate those the final render will suffer a lot, but I didn't manage to find a way "not to use" that many CompositeVideoClips, any idea ?

  


  My PC is not that bad. 16GB, AMD Ryzen 5 5600 6-Core , NVIDIA 1650 SUPER.

  


  My goal is to at least bring the render to less than an hour. Right now is like 1.23s/it

  


• No option name near , Error parsing a filter description around

  8 août 2024, par Aqib Javed

  I am trying to attach the captions files ( srt format ) to a video
if im running the same command on mac or windows, its working with -vf or -filter_complex but on android/IOS, its not working and throwing the same error

  


  i am on Flutter and here is my code :

  


  var tempDir = await getTemporaryDirectory();
var status = await Permission.storage.status;
if (!status.isGranted) {
  await Permission.storage.request();
}

final outputPath = "${tempDir.path}/outputWithCaptions.mp4";


const videoPath = "/storage/emulated/0/Download/english.mp4";
final subtitlePath = deepGramResponse.captionsPath.replaceAll('\'', '\\\'');
String command = "-y -i";
command = "$command '$videoPath'";
command = "$command -vf";
command = '$command "subtitles=\'$subtitlePath\'"';
command = "$command '$outputPath'";
 if (File(videoPath).existsSync() && File(subtitlePath).existsSync()) {
  FFmpegKit.executeAsync(command, (session) async {
    final returnCode = await session.getReturnCode();
    final output = await session.getOutput();
    final error = await session.getFailStackTrace();
    final logs = await session
        .getAllLogs()
        .then((value) => value.map((e) => e.getMessage()).toList());
    log('FFmpeg command executed with return code: $returnCode');
    if (ReturnCode.isSuccess(returnCode)) {
      log('Captions attached successfully');
      deepGramResponse.copyWith(
        videoPath: outputPath,
      );
      Get.to(() => VideoPlayerScreen(videoPath: outputPath));
    } else {
      log('FFmpeg command failed');
      log('Error output: $output');
      log('Error details: $error');
      log('Logs: $logs');
      Fluttertoast.showToast(
          msg: 'Something went wrong, please try again later');
    }
  });
} else {
  log('One or more files do not exist');
  Fluttertoast.showToast(msg: 'Subtitle or video file not found');
  return;
}


  


  and here is the error :

  


   , [AVFilterGraph @ 0x7b8a3dda90] No option name near '/data/user/0/com.example.blink/app_flutter/captions.srt'
  , [AVFilterGraph @ 0x7b8a3dda90] Error parsing a filter description around: 
  , [AVFilterGraph @ 0x7b8a3dda90] 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!