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Autres articles (83)
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Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
To contribute, register to the project users’ mailing (...) -
MediaSPIP en mode privé (Intranet)
17 septembre 2013, parÀ partir de la version 0.3, un canal de MediaSPIP peut devenir privé, bloqué à toute personne non identifiée grâce au plugin "Intranet/extranet".
Le plugin Intranet/extranet, lorsqu’il est activé, permet de bloquer l’accès au canal à tout visiteur non identifié, l’empêchant d’accéder au contenu en le redirigeant systématiquement vers le formulaire d’identification.
Ce système peut être particulièrement utile pour certaines utilisations comme : Atelier de travail avec des enfants dont le contenu ne doit pas (...) -
MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...)
Sur d’autres sites (10340)
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FFMPEG Unable to find a suitable output format for 'pipe :' pipe: : Invalid argument
1er avril 2021, par ashiyaa nunhuckI want to stream video from my drone real time to a WEBUI using ffmpeg. But i get the follwong errors.
The code works but i don't think ishould have gotten this error.
Can somebody help with this issue ? This is my drone commands along with the streaming video codes. I have only added the code to get data.
Below is the error :
pipe error


My code is as follows :


logger = logging.getLogger(__name__)

DEFAULT_DISTANCE = 0.30
DEFAULT_SPEED = 10
DEFAULT_DEGREE = 10

FRAME_X = int(960/3)
FRAME_Y = int(720/3)
FRAME_AREA = FRAME_X * FRAME_Y

FRAME_SIZE = FRAME_AREA * 3
FRAME_CENTER_X = FRAME_X / 2
FRAME_CENTER_Y = FRAME_Y / 2

CMD_FFMPEG = (f'ffmpeg - hwaccel auto -hwaccel_device opencl -i pipe:0 '
 f'-pix_fmt bgr24 -s {FRAME_X}x{FRAME_Y} -f rawvideo pipe:1')


class DroneManager(metaclass=Singleton):
 def __init__(self, host_ip='192.168.10.2', host_port=8890,
 drone_ip='192.168.10.1', drone_port=8889,
 is_imperial=False, speed=DEFAULT_SPEED):
 self.host_ip = host_ip
 self.host_port = host_port
 self.drone_ip = drone_ip
 self.drone_port = drone_port
 self.drone_address = (drone_ip, drone_port)
 self.is_imperial = is_imperial
 self.speed = speed
 self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 self.socket.bind((self.host_ip, self.host_port))

 self.response = None
 self.stop_event = threading.Event()
 self._response_thread = threading.Thread(target=self.receive_response,
 args=(self.stop_event,))
 self._response_thread.start()

 self.patrol_event = None
 self.is_patrol = False
 self._patrol_semaphore = threading.Semaphore(1)
 self._thread_patrol = None

 self.proc = subprocess.Popen(CMD_FFMPEG.split(' '),
 stdin=subprocess.PIPE,
 stdout=subprocess.PIPE)
 self.proc_stdin = self.proc.stdin
 self.proc_stdout = self.proc.stdout

 self.video_port = 11111

 self._receive_video_thread = threading.Thread(
 target=self.receive_video,
 args=(self.stop_event, self.proc_stdin,
 self.host_ip, self.video_port,))
 self._receive_video_thread.start()

 self.send_command('command')
 self.send_command('streamon')
 self.set_speed(self.speed)

 def receive_response(self, stop_event):
 while not stop_event.is_set():
 try:
 self.response, ip = self.socket.recvfrom(3000)
 logger.info({'action': 'receive_response',
 'response': self.response})
 except socket.error as ex:
 logger.error({'action': 'receive_response',
 'ex': ex})
 break

 def __dell__(self):
 self.stop()

 def stop(self):
 self.stop_event.set()
 retry = 0
 while self._response_thread.is_alive():
 time.sleep(0.3)
 if retry > 30:
 break
 retry += 1
 self.socket.close()
 os.kill(self.proc.pid, signal.CTRL_C_EVENT)

 def send_command(self, command):
 logger.info({'action': 'send_command', 'command': command})
 self.socket.sendto(command.encode('utf-8'), self.drone_address)

 retry = 0
 while self.response is None:
 time.sleep(0.3)
 if retry > 3:
 break
 retry += 1

 if self.response is None:
 response = None
 else:
 response = self.response.decode('utf-8')
 self.response = None
 return response

 def takeoff(self):
 return self.send_command('takeoff')

 def land(self):
 return self.send_command('land')

 def move(self, direction, distance):
 distance = float(distance)
 if self.is_imperial:
 distance = int(round(distance * 30.48))
 else:
 distance = int(round(distance * 100))
 return self.send_command(f'{direction} {distance}')

 def up(self, distance=DEFAULT_DISTANCE):
 return self.move('up', distance)

 def down(self, distance=DEFAULT_DISTANCE):
 return self.move('down', distance)

 def left(self, distance=DEFAULT_DISTANCE):
 return self.move('left', distance)

 def right(self, distance=DEFAULT_DISTANCE):
 return self.move('right', distance)

 def forward(self, distance=DEFAULT_DISTANCE):
 return self.move('forward', distance)

 def back(self, distance=DEFAULT_DISTANCE):
 return self.move('back', distance)

 def set_speed(self, speed):
 return self.send_command(f'speed {speed}')

 def clockwise(self, degree=DEFAULT_DEGREE):
 return self.send_command(f'cw {degree}')

 def counter_clockwise(self, degree=DEFAULT_DEGREE):
 return self.send_command(f'ccw {degree}')

 def flip_front(self):
 return self.send_command('flip f')

 def flip_back(self):
 return self.send_command('flip b')

 def flip_left(self):
 return self.send_command('flip l')

 def flip_right(self):
 return self.send_command('flip r')

 def patrol(self):
 if not self.is_patrol:
 self.patrol_event = threading.Event()
 self._thread_patrol = threading.Thread(
 target=self._patrol,
 args=(self._patrol_semaphore, self.patrol_event,))
 self._thread_patrol.start()
 self.is_patrol = True

 def stop_patrol(self):
 if self.is_patrol:
 self.patrol_event.set()
 retry = 0
 while self._thread_patrol.is_alive():
 time.sleep(0.3)
 if retry > 300:
 break
 retry += 1
 self.is_patrol = False

 def _patrol(self, semaphore, stop_event):
 is_acquire = semaphore.acquire(blocking=False)
 if is_acquire:
 logger.info({'action': '_patrol', 'status': 'acquire'})
 with contextlib.ExitStack() as stack:
 stack.callback(semaphore.release)
 status = 0
 while not stop_event.is_set():
 status += 1
 if status == 1:
 self.up()
 if status == 2:
 self.clockwise(180)
 if status == 3:
 self.down()
 if status == 4:
 status = 0
 time.sleep(5)
 else:
 logger.warning({'action': '_patrol', 'status': 'not_acquire'})

 def receive_video(self, stop_event, pipe_in, host_ip, video_port):
 with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sock_video:
 sock_video.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 sock_video.settimeout(5)
 sock_video.bind((host_ip, video_port))
 data = bytearray(2048)
 while not self.stop_event.is_set():
 try:
 size, addr = sock_video.recvfrom_into(data)
 logger.info({'action': 'receive_video', 'data': data})
 except socket.timeout as ex:
 logger.warning({'action': 'receive_video', 'ex': ex})
 time.sleep(0.5)
 continue
 except socket.error as ex:
 logger.error({'action': 'receive_video', 'ex': ex})
 break

 try:
 pipe_in.write(data[:size])
 pipe_in.flush()
 except Exception as ex:
 logger.info({'action': 'receive_video', 'ex': ex})
 break



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How to find out which audio sample belongs to which frame in a video - with ffmpeg or other tools ?
30 mars 2021, par tlau5I am wondering how I would find out which frame in a video belongs to which audio sample.


Lets say : I know audio sample 39822 has the characteristic I am looking for. Using the information contained in the container, I want to find out to which frame the audio sample was recorded. (Key frames/ Samples ?)


I was thinking ffmpeg could help me with this problem.


I tried to find the answer within the ffmpeg documentation but did not succeed.


Maybe you guys can give me a hint which tool (maybe even other than ffmpeg) to use or where to look specific.


Thanks in advance
Tim


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Ffmpeg subtract a track from another
29 mars 2021, par Ching ChangHow do I subtract an audio track from another audio track using ffmpeg ?


I know there is the amerge command that lets you put a track on top of another. Is there a command that does the opposite ? I have a song, and an instrumental version of the song. I want to subtract the instrumental track from the original track to get the vocals.


Every google search led me to examples of subtracting an audio from a video, but I'm trying to subtract an audio from another audio.