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• problem in making HLS using ffmpeg problem

  24 juin 2023, par AMZ

  I have a function do run in background and create m3u8 for some videos : (I is running in background and updating some fields in django).

  


  def convert_to_hls(episode):
    # Set the output directory for HLS files
output_dir = os.path.join(settings.MEDIA_ROOT, 'hls')
os.makedirs(output_dir, exist_ok=True)

# Set the input video file path
input_file_path = episode.videoFile.path

# Set the output filename and path for the HLS playlist
# filename = os.path.splitext(os.path.basename(input_file_path))[0]
characters = string.ascii_letters + string.digits
filename = ''.join(random.choice(characters) for _ in range(45))
playlist_path = os.path.join(output_dir, f'{filename}.m3u8')

# Set the output path for the HLS segments
segments_path = os.path.join(output_dir, f'{filename}_%05d.ts')

# Construct the ffmpeg command for HLS conversion
command = [
    'ffmpeg',
    '-i', input_file_path,
    '-c:v', 'libx264',
    '-crf', '23',
    '-preset', 'medium',
    '-c:a', 'aac',
    '-b:a', '128k',
    '-f', 'hls',
    '-hls_time', '10',
    '-hls_list_size', '0',
    '-hls_segment_filename', segments_path,
    playlist_path
]
# Execute the ffmpeg command
subprocess.run(command, check=True)

episode.hls_created = True
episode.hls_url = playlist_path.replace("/home/debian/project","")
episode.save()

return True


  


  this code works well for most of my videos but for some .mp4 files gets :

  


  [Fri Jun 23 17:05:47.511095 2023] [wsgi:error] [pid 19975:tid 140289048565504] Exception in thread Thread-1:
[Fri Jun 23 17:05:47.511198 2023] [wsgi:error] [pid 19975:tid 140289048565504] Traceback (most recent call last):
[Fri Jun 23 17:05:47.511244 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/opt/bitnami/python/lib/python3.8/threading.py", line 932, in _bootstrap_inner
[Fri Jun 23 17:05:47.512078 2023] [wsgi:error] [pid 19975:tid 140289048565504]     self.run()
[Fri Jun 23 17:05:47.512124 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/opt/bitnami/python/lib/python3.8/threading.py", line 870, in run
[Fri Jun 23 17:05:47.512707 2023] [wsgi:error] [pid 19975:tid 140289048565504]     self._target(*self._args, **self._kwargs)
[Fri Jun 23 17:05:47.512748 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/home/debian/project/twapp/views/episode_backgrounds.py", line 41, in convert_to_hls
[Fri Jun 23 17:05:47.512950 2023] [wsgi:error] [pid 19975:tid 140289048565504]     subprocess.run(command, check=True)
[Fri Jun 23 17:05:47.512989 2023] [wsgi:error] [pid 19975:tid 140289048565504]   File "/opt/bitnami/python/lib/python3.8/subprocess.py", line 516, in run
[Fri Jun 23 17:05:47.513500 2023] [wsgi:error] [pid 19975:tid 140289048565504]     raise CalledProcessError(retcode, process.args,
[Fri Jun 23 17:05:47.513657 2023] [wsgi:error] [pid 19975:tid 140289048565504] subprocess.CalledProcessError: Command '['ffmpeg', '-i', '/home/debian/project/media/videos/introduction_to_raster_qBhrnAx.mp4', '-c:v', 'libx264', '-crf', '23', '-preset', 'medium', '-c:a', 'aac', '-b:a', '128k', '-f', 'hls', '-hls_time', '10', '-hls_list_size', '0', '-hls_segment_filename', '/home/debian/project/media/hls/ZN3fsJVEfTDEc8MFb5DrP7Y34JFNLj0hfWnGRZAwFdjuG_%05d.ts', '/home/debian/project/media/hls/ZN3fsJVEfTDEc8MFb5DrP7Y34JFNLj0hfWnGRZAwFdjuG.m3u8']' returned non-zero exit status 1.


  


  Also it does not work for .MOV files.

  


• Merge .mkv files with already included subtitles using ffmpeg-python

  9 mars 2023, par Eeshe

  I'm trying to merge two (and more in the future) .mkv files that already have subtitles included in them, this means I DO NOT have .srt files that need to be encoded. Let's call the .mkv files intro.mkv and episode.mkv.

  


  However, the way I want to merge them is so a portion of the episode.mkv file is played until a specified timestamp, then intro.mkv plays completely, and after that the rest of episode.mkv.

  


  I've managed to get close with the following code.

  


  import ffmpeg

initial_episode_video = ffmpeg.input('episode.mkv', to='00:00:34.033', hwaccel='cuvid')
intro_video = ffmpeg.input('intro.mkv', hwaccel='cuvid')
remaining_episode_video = ffmpeg.input('episode.mkv', ss='00:00:34.033', hwaccel='cuvid')

full_episode_video = ffmpeg.concat(initial_episode_video, intro_video, remaining_episode_video)

output_video = ffmpeg.output(
    full_episode_video,
    filter_complex='[0:v][0:a][1:v][1:a][2:v][2:a]concat=n=3:v=1:a=1',
    vprofile='main', 
    vcodec='h264_nvenc',
    pix_fmt='yuv420p',
    crf=22,
    map="0:s",
    filename=f'Output/{episode_path}')
ffmpeg.run(output_video)


  


  With this code, the videos are correctly trimmed. The problem is that once intro.mkv starts playing, it doesn't show the subtitles corresponding to it, instead it shows the episode.mkv subtitles corresponding to the '00:00:34.033' timestamp.

  


  My objective is to display the subtitles of intro.mkv, and then, once the full intro is played, continue with the subtitles from episode.mkv.

  


  NOTE : I am aware that I am re-encoding both the episode.mkv and intro.mkv files. If possible, I'd prefer if it only re-encodes episode.mkv, since intro.mkv only needs to be re-encoded once (I can do that individually). I am re-encoding to go from H.264 Hi 10 to H.264 main profile.

  


• ffmpeg adds silence when used with input text file

  1er octobre 2022, par AncientToaster

  I'm using ffmpeg's concat option to combine a series of still images with an mp3 file. The total duration of my input.txt file is 12532 seconds, which is exactly the same as the total duration of my mp3 file (3:28:52, or 12532 seconds).

  


  But ffmpeg is adding 200 seconds of audio-free content to the end of the video. I've tried totaling and re-totaling the total duration of input.txt and it all seems to add up to the same amount. Including or excluding the -shortest flag also doesn't seem to matter.

  


  


  • ffmpeg command :

    


    ffmpeg -f concat -i input.txt -i input.mp3 -shortest -c:v libx264 -r 1 -pix_fmt yuv420p output.mp4


    


  


  • input.txt source

    


  


  • input.mp3

    


  


  • output file

    


  


  


  I'm having the same issue (differing amounts of time) with other videos.