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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 ?

  


• Set minimal ts duration in ffmpeg command

  22 août 2017, par Ales

  We are using ffmpeg to convert mp4 video file to hls.
  When video is converted, it sometimes happens that last ts chunk is about 0.03s. And player stalls on this chunk for a while. Is there a special command in ffmpeg to set minimal ts duration ? Or other way to avoid such ts chunks ?
  In our command to set up ts duration we use : -segment_time  5

• Minimal patch for G.729 demuxer

  29 octobre 2011, par Vladimir Voroshilov

  Minimal patch for G.729 demuxer