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• How to write to fifo in while loop and read in continuous process

  18 avril 2019, par Russ_ell

  I’m running 3 multiprocess while loops that each write to seperate fifo’s , that are read by a continuously running ffmpeg process. This runs for the first loop of each process then stops.

  The code below is one of the write loops ( the other two are pretty much the same ), and the read process.

  def dubv():
  
      while True:
  
        print('loop')
  
        file, dur = getFile('vocal')
  
        fx = (
  
            AudioEffectsChain()
  
            .delay()
  
        )
  
        songvfx = fx(file)
  
        with open('/tmp/pipe2.fifo', 'wb') as p1:
  
            print('open s fifo')
  
            p1.write(songvfx.T.tobytes())
  
            p1.close()
  
            print('close s fifo')
  
        del songvfx
  
  
  
  def mixer():
  
      command4 = [
  
          'ffmpeg',
  
          '-nostdin',
  
          '-re',
  
          '-y',
  
          '-thread_queue_size', '4096',
  
          '-ac', '2',
  
          '-ar', '44100',
  
          '-f', 'f32le',
  
          '-i', '/tmp/pipe1.fifo',
  
          '-thread_queue_size', '4096',
  
          '-ac', '2',
  
          '-ar', '44100',
  
          '-f', 'f32le',
  
          '-i', '/tmp/pipe2.fifo',
  
          '-thread_queue_size', '4096',
  
          '-ac', '2',
  
          '-ar', '44100',
  
          '-f', 'f32le',
  
          '-i', '/tmp/pipe3.fifo',
  
          '-filter_complex', '[0][1][2]amix=inputs=3:dropout_transition=3[map]',
  
          '-map', '[map]',
  
          '-c:a', 'libmp3lame',
  
          '-b:a', '320k',
  
          '-f', 'mp3',
  
          'icecast://source:hackme@localhost:8000/test'
  
      ]
  
      o = open('/tmp/pipe1.fifo', 'rb')
  
      o2 = open('/tmp/pipe2.fifo', 'rb')
  
      o3 = open('/tmp/pipe3.fifo', 'rb')
  
      mix = sp.Popen(command4, stdin=DEVNULL, bufsize=4096)
  
      mix.wait()

  I’d like the write process to write to fifo2 , then loop and continue writing to fifo2 , to be read in the mixer process continuously.

  EDIT :

  I think the problem is coming from the reader closing as the loop runs once , then runs round the loop , open the fifo but never prints ’close s fifo’ again , so i presume it cant write to the file ?

  EDIT 2 :

  I have resolved this by moving the fifo close out of the loop. My writer is now

  def dubv():
  
    with open('/tmp/pipe2.fifo', 'wb') as p2:
  
      while True:
  
        print('loop')
  
        file, dur = getFile('vocal')
  
        fx = (
  
            AudioEffectsChain()
  
            .delay()
  
        )
  
        songvfx = fx(file)
  
        p2.write(songvfx.T.tobytes())
  
        del songvfx
  
        time.sleep(2)
  
    p2.close()
  
    print('close s fifo')

  and the reader doesn’t open the fifo files as ffmpeg seems to deal with this.

  def mixer():
  
    command4 = [
  
        'ffmpeg',
  
        '-re',
  
        '-y',
  
        '-thread_queue_size', '4096',
  
        '-ac', '2',
  
        '-ar', '44100',
  
        '-f', 'f32le',
  
        '-i', '/tmp/pipe1.fifo',
  
        '-thread_queue_size', '4096',
  
        '-ac', '2',
  
        '-ar', '44100',
  
        '-f', 'f32le',
  
        '-i', '/tmp/pipe2.fifo',
  
        '-thread_queue_size', '4096',
  
        '-ac', '2',
  
        '-ar', '44100',
  
        '-f', 'f32le',
  
        '-i', '/tmp/pipe3.fifo',
  
        '-filter_complex', '[0][1][2]amix=inputs=3:dropout_transition=3[map]',
  
        '-map', '[map]',
  
        '-c:a', 'libmp3lame',
  
        '-b:a', '320k',
  
        '-f', 'mp3',
  
        'icecast://source:hackme@localhost:8000/test'
  
    ]
  
    mix = sp.Popen(command4, stdin=DEVNULL, bufsize=4096)
  
    mix.wait()

  If anybody see a ’better’ solution please comment.

  Thank you

• Accented characters are not recognized in python [closed]

  10 avril 2023, par CorAnna

  I have a problem in the python script, my script should put subtitles in a video given a srt file, this srt file is written by another script but in its script it replaces the accents and all the particular characters with a black square symbol with a question mark inside it... the problem I think lies in the writing of this file, what follows and that in overwriting the subtitles I do with ffmpeg the sentences that contain an accented word are not written

  


  def video_audio_file_writer(video_file):

    videos_folder = "Video"
    audios_folder = "Audio"

    video_path = f"{videos_folder}\\{video_file}"

    video_name = Path(video_path).stem
    audio_name = f"{video_name}Audio"

    audio_path = f"{audios_folder}\\{audio_name}.wav"

    video = mp.VideoFileClip(video_path)
    audio = video.audio.write_audiofile(audio_path)

    return video_path, audio_path, video_name

    def audio_file_transcription(audio_path, lang):

    model = whisper.load_model("base")
    tran = gt.Translator()

    audio_file = str(audio_path)

    options = dict(beam_size=5, best_of=5)
    translate = dict(task="translate", **options)
    result = model.transcribe(audio_file, **translate)   

    return result

def audio_subtitles_transcription(result, video_name):

    subtitle_folder = "Content"
    subtitle_name = f"{video_name}Subtitle"
    subtitle_path_form = "srt"

    subtitle_path = f"{subtitle_folder}\\{subtitle_name}.{subtitle_path_form}"

    with open(os.path.join(subtitle_path), "w") as srt:
        # write_vtt(result["segments"], file=vtt)
        write_srt(result["segments"], file=srt)
            
    return subtitle_path

def video_subtitles(video_path, subtitle_path, video_name):

    video_subtitled_folder = "VideoSubtitles"
    video_subtitled_name = f"{video_name}Subtitles"
    video_subtitled_path = f"{video_subtitled_folder}\\{video_subtitled_name}.mp4"

    video_path_b = bytes(video_path, 'utf-8')
    subtitle_path_b = bytes(subtitle_path, 'utf-8')
    video_subtitled_path_b = bytes(video_subtitled_path, 'utf-8')

    path_abs_b = os.getcwdb() + b"\\"

    path_abs_bd = path_abs_b.decode('utf-8')
    video_path_bd= video_path_b.decode('utf-8')
    subtitle_path_bd = subtitle_path_b.decode('utf-8')
    video_subtitled_path_bd = video_subtitled_path_b.decode('utf-8')

    video_path_abs = str(path_abs_bd + video_path_bd)
    subtitle_path_abs = str(path_abs_bd + subtitle_path_bd).replace("\\", "\\\\").replace(":", "\\:")
    video_subtitled_path_abs = str(path_abs_bd + video_subtitled_path_bd)

    time.sleep(3)

    os.system(f"ffmpeg -i {video_path_abs} -vf subtitles='{subtitle_path_abs}' -y {video_subtitled_path_abs}")

    return video_subtitled_path_abs, video_path_abs, subtitle_path_abs

if __name__ == "__main__":

    video_path, audio_path, video_name = video_audio_file_writer(video_file="ChiIng.mp4")
    result = audio_file_transcription(audio_path=audio_path, lang="it")
    subtitle_path = audio_subtitles_transcription(result=result, video_name=video_name)
    video_subtitled_path_abs, video_path_abs, subtitle_path_abs = video_subtitles(video_path=video_path, subtitle_path=subtitle_path, video_name=video_name)
    
    print("Video Subtitled")


  


  Windows 11
Python 3.10

  


• FFmpeg starting manually but not with Systemd on boot

  23 juin 2021, par eKrajnak

  On Raspberry Pi 4 B 4GB with official Debian 10 image, I have /home/pi/run.sh script with following :

  


  #!/bin/bash
ffmpeg -nostdin -framerate 15 -video_size 1280x720 -input_format yuyv422  -i /dev/video0 -f alsa -i hw:Device \
    -af acompressor=threshold=-14dB:ratio=9:attack=10:release=1000 -c:a aac -ac 2 -ar 48000 -ab 160k \
    -c:v libx264 -pix_fmt yuv420p -b:v 3M -bf 1 -g 20 -flags +ilme+ildct -preset ultrafast \
    -streamid 0:0x101 -streamid 1:0x100 -mpegts_pmt_start_pid 4096 -mpegts_start_pid 0x259 -metadata:s:a:0 language="" -mpegts_service_id 131 -mpegts_transport_stream_id 9217 -metadata provider_name="Doesnt matter" -metadata service_name="Doesnt matter" \
    -minrate 3500 -maxrate 3500k -bufsize 4500k -muxrate 4000k  -f mpegts "udp://@239.1.67.13:1234?pkt_size=1316&bitrate=4000000&dscp=34" -loglevel debug < /dev/null > /tmp/ff3.log 2>&1


  


  Script is starting from console without problems. It takes audio from USB sound card and video from USB camera and creates UDP stream to IPTV. Then I created Systemd service :

  


  [Unit]
Description=Streamer
After=multi-user.target sound.target network.target

[Service]
ExecStart=/home/pi/run.sh
KillMode=control-group
Restart=on-failure
TimeoutSec=1

[Install]
WantedBy=multi-user.target
Alias=streaming.service


  


  After restarting Raspberry, script has started, but FFmpeg hangs on error failures in log :

  


  cur_dts is invalid st:0 (257) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:1 (256) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (257) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:1 (256) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (257) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:1 (256) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:0 (257) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
cur_dts is invalid st:1 (256) [init:1 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)


  


  and will not start streaming to UDP target. But, if I manually login to SSH and issue systemctl stop streaming and then systemctl start streaming Ffmpeg starts successfully. What's different with service auto-start on boot ?

  


  Setting the "sleep timeout" at script begginging will not help. However, removing audio stream from FFmpeg config looks to solve auto-start on boot.