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• Handling multiple line subtitles of Right aligned languages(arabic) in Moviepy

  24 décembre 2023, par Stanger Danger

  I am trying to add Arabic subtitles on a video using Moviepy. The issue I'm facing is related to alignment of Arabic text, as it progresses from right to left, instead of left to right in English language.

  


  

  


  As text length gets more and more, Moviepy trims the words from both ends, this issue can be resolved if we break the text into multiple lines. This works well for English language but for Arabic, the first line becomes the last line because of the (Right-Left)alignment.

  


  

  


  The text on Second line should come first on the first line at the start, while end chuck of first text towards the left corner should render on the second line, but it is getting rendered as English language, Left to right alignment.

  


  Here is my code :

  


  def add_subtitles(address_subtitles, address_video):
  video = VideoFileClip(address_video)
  generator = lambda txt: TextClip(txt, font='Arial', fontsize=22, color='black', stroke_width=2, method='caption', align='south', size=video.size)
  subtitles = SubtitlesClip(address_subtitles, generator)
  #print()

  result = CompositeVideoClip([video, subtitles.set_pos(('center','bottom'))])
  result.write_videofile("arabic_with_hardcoded_subtitles_3.mp4", fps=video.fps, temp_audiofile="temp-audio.m4a", remove_temp=True, codec="libx264"
  , audio_codec="aac")


  


• How to embed subtitles in multiple movies in an automated way using python ?

  8 juin 2023, par Ricardo Madela

  This python script identifies all movies with mp4 extension and, if they have subtitles in srt format, converts the subtitle encoding to utf-8 (without this conversion you will get error message) and starts building the movie with the subtitle embedded.

  


  for filename in glob.glob("*.mp4"):
    print(str(filename))
    if 'wsubs' not in filename:
        for legenda in glob.glob(filename.replace(".mp4",".srt")):
            try:
                with open(legenda, 'r') as arquivo_orig:
                    conteudo = arquivo_orig.read()
                with open(legenda, 'w', encoding='utf-8') as novo_arquivo:
                    novo_arquivo.write(conteudo)
            except Exception as e:
                print("Já codificado")
            print(str(legenda))
            os.system('ffmpeg -i "' + str(filename) + '" -vf subtitles="' + str(legenda) + '" -maxrate 2000000 -crf 20 "' + str(filename.replace('.mp4','-wsubs.mp4')) + '"')


  


  The end result will be a subtitled movie with the expression "wsubs" at the end of the name. The original files will be preserved.

  


• Subtitles but no continuous playback, or playback with no subtitles

  27 janvier 2024, par KCpremo

  I am using this command as part of generating a live HLS stream that ingests a separate HLS stream consisting of 4 second .ts files, translates the feed in 30 second chunks, and spits out the video with translations (in 30 second ts files). However, I have hit a roadblock.

  


  If I use the '-copyts' flag, the livestream plays back just fine in hls.js player, but WITHOUT the subtitles burned in or included as an accessible separate track. If I remove '-copyts', the playback stops at the end of the first segment and won't progress further, but the subtitles ARE present. The subtitles are pivotal to my whole project, so I really can't do without them.

  


  I've also tried several other methods like re-encoding the original files before processing them, creating a transparent video with the subtitles and overlaying it, using VLC, and some other workarounds, but it all seems to boil down to either subtitles with improper playback, or proper playback without subtitles.

  


  Do you have any suggestions ?

  


  command = [
        'ffmpeg',
        '-y',
        '-i', f'concat:{concat_string}',  # Input using concat protocol
        '-vf', f"subtitles='{translation_vtt}':force_style='FontName=Arial,FontSize=24,PrimaryColour=&H00FFFFFF,Outline=1,OutlineColour=&H00000000,BackColour=&H80000000,BorderStyle=3',scale=854:480",
        '-c:v', 'libx264',  # H264 video codec
        '-c:a', 'aac',  # AAC audio codec
        '-b:a', '128k',  # Audio bitrate
        #'-c:s', 'mov_text',
        #'-metadata:s:s:0', 'language=eng',
        '-copyts',
        '-preset', 'fast',
        output_video  # Output file
    ]