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• Show video length in HLS player before all TS files are created

  14 novembre 2022, par WilliamTaco

  I have a spring-boot backend which on request (on demand) uses ffmpeg to create a m3u8 playlist with its ts files from a mp4 file. So basically my react frontend requests the index.m3u8 from the backend and if it doesnt already exist it creates it and then start serving it with its ts files. This causes the frontend HLS player to show the length of the video to the combined length of the generated chunks which gets longer as time goes on until its fully there. It totally makes sense but was wondering what the correct way of showing the full length in the player even though its not fully created yet ?

  


  Im using react-hls-player for playing the stream and spring-boot + a java ffmpeg wrapper to transcode the video.

  


  Might be thinking about this the wrong way so feel free to correct me if im in the wrong path !

  


• Show progress bar of a ffmpeg video convertion

  13 juin 2022, par stackexchange.com-upvm25mz

  I'm trying to print a progress bar while executing ffmpeg but I'm having trouble getting the total number of frames and the current frame being processed. The error I get is AttributeError: 'NoneType' object has no attribute 'groups'. I've copied the function from this program and for some reason it works there but not here, even though I haven't changed that part.

  


  main.py

  


  pattern_duration = re.compile(
    'duration[ \t\r]?:[ \t\r]?(.+?),[ \t\r]?start', re.IGNORECASE)
pattern_progress = re.compile('time=(.+?)[ \t\r]?bitrate', re.IGNORECASE)

def execute_ffmpeg(self, manager, cmd):
    proc = expect.spawn(cmd, encoding='utf-8')
    self.update_progress_bar(proc, manager)
    self.raise_ffmpeg_error(proc)

def update_progress_bar(self, proc, manager):
    total = self.get_total_frames(proc)
    cont = 0
    pbar = self.initialize_progress_bar(manager)
    try:
        proc.expect(pattern_duration)
        while True:
            progress = self.get_current_frame(proc)
            percent = progress / total * 100
            pbar.update(percent - cont)
            cont = percent
    except expect.EOF:
        pass
    finally:
        if pbar is not None:
            pbar.close()

def raise_ffmpeg_error(self, proc):
    proc.expect(expect.EOF)
    res = proc.before
    res += proc.read()
    exitstatus = proc.wait()
    if exitstatus:
        raise ffmpeg.Error('ffmpeg', '', res)

def initialize_progress_bar(self, manager):
    pbar = None
    pbar = manager.counter(
        total=100,
        desc=self.path.rsplit(os.path.sep, 1)[-1],
        unit='%',
        bar_format=BAR_FMT,
        counter_format=COUNTER_FMT,
        leave=False
    )
    return pbar

def get_total_frames(self, proc):
    return sum(map(lambda x: float(
        x[1])*60**x[0], enumerate(reversed(proc.match.groups()[0].strip().split(':')))))

def get_current_frame(self, proc):
    proc.expect(pattern_progress)
    return sum(map(lambda x: float(
                x[1])*60**x[0], enumerate(reversed(proc.match.groups()[0].strip().split(':')))))


  


• avdevice/dshow : list_devices : show media type(s) per device

  21 décembre 2021, par Diederick Niehorster

  avdevice/dshow : list_devices : show media type(s) per device
  the list_devices option of dshow didn't indicate whether a specific
  
  device provides audio or video output. This patch iterates through all
  
  media formats of all pins exposed by the device to see what types it
  
  provides for capture, and prints this to the console for each device.
  
  Importantly, this now allows to find devices that provide both audio and
  
  video, and devices that provide neither.
  Signed-off-by : Diederick Niehorster <dcnieho@gmail.com>
  
  Reviewed-by : Roger Pack <rogerdpack2@gmail.com>
  

  • [DH] libavdevice/dshow.c