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• Why are rectangular boxes ([]) showing instead of text in burned subtitles when using ffmpeg/MoviePy on Google Colab ?

  14 mai, par Lavish

  I'm working on a Python script that adds subtitles to a video using MoviePy and burns/hardcodes them directly onto the video. The subtitles contain Hindi text, and I’ve specified a custom font that supports Devanagari (Hindi) script.

  


  The code works perfectly fine on my local machine, the subtitles appear correctly with Hindi characters. However, when I run the same code on Google Colab, the subtitles display as rectangular boxes (something like this -> [][][]) instead of proper characters.

  


  Things I've tried :

  


  

  • Ensured the font used supports Hindi (I'm using NotoSansDevanagari-Regular.ttf renamed as font.ttf).

  


  • Uploaded the font to Colab and specified the full path correctly.

  


  • Verified that the text is passed as a proper Unicode string.

  


  


  Here's the code snippet :

  


  def add_subtitles(video_path, subtitles_path, output_path):
    """Adds subtitles using FFmpeg with proper path escaping."""
    # Convert to absolute paths and normalize
    
    video_path = os.path.abspath(video_path)
    subtitles_path = os.path.abspath(subtitles_path)
    output_path = os.path.abspath(output_path)


    # Subtitle path
    font_path = "input_files/font.ttf"
    font_path = os.path.abspath(font_path).replace("\\", "\\\\")
    subtitles_path_escaped = os.path.abspath(subtitles_path).replace("\\", "\\\\")
    
    # Escape backslashes in paths
    subtitles_path = subtitles_path.replace("\\", "\\\\")
    # Remove all files in final_videos
    [os.remove(os.path.join(base_dir, "final_videos", f)) for f in os.listdir(os.path.join(base_dir, "final_videos")) if os.path.isfile(os.path.join(base_dir, "final_videos", f))]

    os.makedirs(os.path.dirname(output_path), exist_ok=True)
    escaped_path = subtitles_path.replace(':', '\\:').replace('\\', '\\\\')

    cmd = [
    "ffmpeg",
    "-i", video_path,
    "-vf", f"subtitles={escaped_path}:force_style='FontFile={font_path}'",
    "-c:v", "libx264",
    "-c:a", "copy",
    "-preset", "fast",
    "-crf", "22",
    output_path
]


    # Debug: Print the exact command being executed
    print("Executing:", " ".join(cmd))
    try:
        subprocess.run(cmd, check=True, capture_output=True, text=True)
        print(f"✅ Success! Output saved to: {output_path}")
    except subprocess.CalledProcessError as e:
        print(f"❌ FFmpeg failed with error:\n{e.stderr}")



  


  What could be causing this issue on Colab, and how can I get non-English subtitles (like Hindi) to render properly when burning subtitles using MoviePy/ffmpeg in a Colab environment ?

  


• Can ffmpeg copy metadata/ID3 from FLAC to MP3 ?

  9 avril 2019, par krypterro

  I have a bit of Python code that loops through audio files, finds .FLAC files, and then uses the Python subcommand to run ffmpeg. It works. The audio is fine, but even though I see the metadata in the shell, it doesn’t transfer the data to the ID3 tags in the MP3, and I am using the example found in the previous post here. Here’s the command :

  cmd = 'ffmpeg -y -i "' + src + '" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "' + dst + '"'

  Which works out to :

  ffmpeg -y -i "source.flac" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "destination.mp3"

  And here is the log dump :

  /usr/local/bin/python3.7 /home/krypterro/PycharmProjects/mediaman/RipFLAC.py
  
  1 Music Files Found
  
  2019-04-09 14:32:47.758 | INFO     | __main__:main:31 - Start of program
  
  2019-04-09 14:32:48.110 | DEBUG    | __main__:ripmp3:206 - Running Command: ffmpeg -y -i "/home/krypterro/audio/music_in/Visions/01-grimes-laughing_and_not_being_normal.flac" -acodec libmp3lame -ab 192000 "/home/krypterro/audio/music_out/Visions/01-grimes-laughing_and_not_being_normal.mp3"
  
  ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    WARNING: library configuration mismatch
  
    avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, flac, from '/home/krypterro/audio/music_in/Visions/01-grimes-laughing_and_not_being_normal.flac':
  
    Metadata:
  
      ARTIST          : Grimes
  
      TITLE           : Laughing And Not Being Normal
  
      ALBUM           : Art Angels
  
      DATE            : 2015
  
      track           : 1
  
      GENRE           : Electronic
  
      disc            : 1
  
      TOTALDISCS      : 1
  
      TOTALTRACKS     : 15
  
      LANGUAGE        : English
  
      RIP DATE        : 2015-12-12
  
      RETAIL DATE     : 2015-00-00
  
      MEDIA           : CD
  
      ENCODER         : FLAC 1.2.1 -8 -V
  
      RIPPING TOOL    : EAC 1.0 Beta 3
  
      RELEASE TYPE    : Retail
  
      ORGANIZATION    : 4AD
  
      CATALOG         : CAD3535CD
  
    Duration: 00:01:47.51, start: 0.000000, bitrate: 743 kb/s
  
      Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  Output #0, mp3, to '/home/krypterro/audio/music_out/Visions/01-grimes-laughing_and_not_being_normal.mp3':
  
    Metadata:
  
      TPE1            : Grimes
  
      TIT2            : Laughing And Not Being Normal
  
      TALB            : Art Angels
  
      TDRC            : 2015
  
      TRCK            : 1
  
      TCON            : Electronic
  
      TPOS            : 1
  
      TOTALDISCS      : 1
  
      TOTALTRACKS     : 15
  
      TLAN            : English
  
      RIP DATE        : 2015-12-12
  
      RETAIL DATE     : 2015-00-00
  
      MEDIA           : CD
  
      CATALOG         : CAD3535CD
  
      RIPPING TOOL    : EAC 1.0 Beta 3
  
      RELEASE TYPE    : Retail
  
      ORGANIZATION    : 4AD
  
      TSSE            : Lavf57.83.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc57.107.100 libmp3lame
  
  size=    2522kB time=00:01:47.52 bitrate= 192.1kbits/s speed=  41x    
  
  video:0kB audio:2521kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.042501%
  
  2019-04-09 14:32:50.811 | INFO     | __main__:main:73 - End of program
  
  
  
  Process finished with exit code 0

• 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!