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Chuck D with Fine Arts Militia - No Meaning No
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Paul Westerberg - Looking Up in Heaven
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Le Tigre - Fake French
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Thievery Corporation - DC 3000
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Dan the Automator - Relaxation Spa Treatment
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Gilberto Gil - Oslodum
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
Autres articles (62)
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16 avril 2011, parMediaSPIP 0.1 beta est la première version de MediaSPIP décrétée comme "utilisable".
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Pour avoir une installation fonctionnelle, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
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Sur d’autres sites (12347)
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Podcast Producer 2 REST api
11 septembre 2009I’ve been working on documenting the REST api that PCP2 uses for client server communication as part of a new project. I thought it might be useful to other folks. Consider this a work in progress - I’ve only documented the workflow for doing a multisource recording so far. Follow the job for the info.
Each section gives a sample command and a sample response.
All pages are behind basic HTTP auth.
General sequence of events
* get workflow list
* get cameras
* request status for camera (including thumbnail)
* start cameras
* create recording enclosure
* stop cameras, provide submission_UUID returned by above step, include title
*URL : https://pcpserver:8170/podcastproducer/info
*Type : GET
*Content : version=2
*Response :
<pre>
<podcast_producer_result>
<action>index</action>
<status>success</status>
<plist version="1.0">
<dict>
<key>server_version</key>
<string>2.0</string>
<key>http_auth_type</key>
<array>
<string>basic</string>
<string>digest</string>
<string>kerberos</string>
</array>
<key>krb_service_principals</key>
<array>
<string>pcast/x101-186-103-dhcp.cla.umn.edu@X101-186-103-DHCP.CLA.UMN.EDU</string>
</array>
<key>server_uuid</key>
<string>DB31DA49-10AE-472C-B3B9-86A8F8112399</string>
<key>cluster_members</key>
<dict>
<key>F1021B98-7E7E-44FB-8EB1-E0DA1885D5BA</key>
<dict>
<key>date_added</key>
<string>Tue Sep 01 10:23:49 -0500 2009</string>
<key>last_update</key>
<string>Tue Sep 08 10:35:17 -0500 2009</string>
<key>server_host</key>
<string>x101-186-103-dhcp.cla.umn.edu</string>
<key>server_port</key>
<string>8170</string>
<key>tunnel_agent_host</key>
<string>x101-186-103-dhcp.cla.umn.edu</string>
<key>tunnel_agent_port</key>
<string>8175</string>
<key>network_addrs</key>
<array>
<string>128.101.186.103</string>
</array>
</dict>
</dict>
</dict>
</plist>
</podcast_producer_result>
</pre>
* URL : https://pcpserver:8170/podcastproducer/workflows
* Type : GET
* Content : version=2&language=en
* Response :
<pre>
<podcast_producer_result>
<action>index</action>
<status>success</status>
<results>OK</results>
<plist version="1.0">
<dict>
<key>user_fullname</key>
<string>podcast</string>
<key>user_shortname</key>
<string>podcast</string>
<key>workflows</key>
<array>
<dict>
<key>name</key>
<string>Montage</string>
<key>title</key>
<string>Montage</string>
<key>description</key>
<string>Montage workflow</string>
<key>uuid</key>
<string>F797D54D-1539-42AA-B6AC-3CB3A4C15EF5</string>
<key>version</key>
<string>2.0</string>
<key>editor</key>
<string>Podcast Composer</string>
<key>sources</key>
<array>
<dict>
<key>contentTypes</key>
<array>
<string>com.apple.quicktime-movie</string>
<string>com.adobe.pdf</string>
<string>com.apple.iwork.keynote.key</string>
<string>com.apple.iwork.pages.pages</string>
<string>org.openxmlformats.wordprocessingml.document</string>
<string>com.microsoft.word.doc</string>
<string>org.openxmlformats.presentationml.presentation</string>
<string>com.microsoft.powerpoint.ppt</string>
<string>com.microsoft.bmp</string>
<string>com.compuserve.gif</string>
<string>public.jpeg-2000</string>
<string>public.jpeg</string>
<string>com.adobe.pdf</string>
<string>com.apple.pict</string>
<string>public.png</string>
<string>com.adobe.photoshop-image</string>
<string>com.sgi.sgi-image</string>
<string>com.truevision.tga-image</string>
<string>public.tiff</string>
</array>
<key>description</key>
<string>Any Document</string>
<key>isFolder</key>
<true/>
<key>isOptional</key>
<false/>
<key>sourceTypes</key>
<array>
<string>File</string>
</array>
</dict>
</array>
<key>user_requirements</key>
<array>
<string>Title</string>
<string>Description</string>
</array>
<key>access_control_entries</key>
<array>
</array>
</dict>
<dict>
<key>name</key>
<string>Single Source</string>
<key>title</key>
<string>Single Source</string>
<key>description</key>
<string>Single Source workflow</string>
<key>uuid</key>
<string>DEFA1587-A650-426E-92DA-01C5EB811705</string>
<key>version</key>
<string>2.0</string>
<key>editor</key>
<string>Podcast Composer</string>
<key>sources</key>
<array>
<dict>
<key>contentTypes</key>
<array>
<string>com.apple.quicktime-movie</string>
</array>
<key>description</key>
<string>Any Video</string>
<key>isFolder</key>
<false/>
<key>isOptional</key>
<false/>
<key>sourceTypes</key>
<array>
<string>Video</string>
<string>Screen</string>
<string>Audio</string>
<string>File</string>
</array>
</dict>
</array>
<key>user_requirements</key>
<array>
<string>Title</string>
<string>Description</string>
</array>
<key>access_control_entries</key>
<array>
</array>
</dict>
</array>
</dict>
</plist>
</podcast_producer_result>
</pre>
----* URL : https://pcpserver:8170/podcastproducer/cameras
* Type : GET
* Content : version=2
* Response :
<pre>
<podcast_producer_result>
<action>index</action>
<status>success</status>
<plist version="1.0">
<dict>
<key>cameras</key>
<array>
<dict>
<key>name</key>
<string>150-A Camera</string>
<key>uuid</key>
<string>307682A5-B552-4AFA-B7E2-3811D772C9A1</string>
<key>connected_to_member_uuid</key>
<string>F1021B98-7E7E-44FB-8EB1-E0DA1885D5BA</string>
<key>in_use</key>
<string>false</string>
<key>recording_status</key>
<string>online</string>
<key>preview_url</key>
<string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/307682A5-B552-4AFA-B7E2-3811D772C9A1.jpg</string> ;
<key>access_control_entries</key>
<array>
</array>
</dict>
<dict>
<key>name</key>
<string>150-A Epiphan</string>
<key>uuid</key>
<string>CE610AB0-CA50-49EB-8FFE-78E57CDCA550</string>
<key>connected_to_member_uuid</key>
<string>F1021B98-7E7E-44FB-8EB1-E0DA1885D5BA</string>
<key>in_use</key>
<string>false</string>
<key>recording_status</key>
<string>online</string>
<key>preview_url</key>
<string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/CE610AB0-CA50-49EB-8FFE-78E57CDCA550.jpg</string> ;
<key>access_control_entries</key>
<array>
</array>
</dict>
</array>
</dict>
</plist>
</podcast_producer_result>
</pre>
* URL : https://pcpserver:8170/podcastproducer/cameras/start
* Type : POST
* Content : action=pause&version=2&camera_name=150-A%20Camera&controller=cameras
* Response :
<pre>
<podcast_producer_result>
<action>start</action>
<status>success</status>
<results>OK</results>
</podcast_producer_result>
</pre>
* URL : https://pcpserver:8170/podcastproducer/cameras/status
* Type : POST
* Content : delay=0&action=start&version=2&camera_name=150-A%20Epiphan&controller=cameras
* Response :
<pre><podcast_producer_result>
<action>status</action>
<status>success</status>
<results>OK</results>
<plist version="1.0">
<dict>
<key>preview</key>
<string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/307682A5-B552-4AFA-B7E2-3811D772C9A1.jpg</string> ;
<key>preview_image_data</key>
<string>RAW JPEG DATA RAW JPEG DATA RAW JPEG DATA RAW JPEG DATA RAW JPEG DATA</string>
<key>recording_status</key>
<string>online</string>
<key>started_at</key>
<string>Tue Sep 08 09:31:40 -0500 2009</string>
<key>stopped_at</key>
<string>Tue Sep 08 09:32:10 -0500 2009</string>
<key>elapsed</key>
<string>41</string>
<key>last_error</key>
<string>805306368</string>
</dict>
</plist>
</podcast_producer_result>
</pre>
* URL : https://pcpserver:8170/podcastproducer/cameras/pause
* Type : POST
* Content : action=pause&version=2&camera_name=150-A%20Camera&controller=cameras
* Response :
<pre><podcast_producer_result>
<action>status</action>
<status>success</status>
<results>OK</results>
<plist version="1.0">
<dict>
<key>preview</key>
<string>https://x101-186-103-dhcp.cla.umn.edu:8170/podcastproducer/previews/307682A5-B552-4AFA-B7E2-3811D772C9A1.jpg</string> ;
<key>recording_status</key>
<string>online</string>
<key>started_at</key>
<string>Tue Sep 08 09:31:40 -0500 2009</string>
<key>stopped_at</key>
<string>Tue Sep 08 09:32:10 -0500 2009</string>
<key>elapsed</key>
<string>41</string>
<key>last_error</key>
<string>805306368</string>
</dict>
</plist>
</podcast_producer_result></pre>
* URL : https://pcpserver:8170/podcastproducer/cameras/stop
* Type : POST
* Content : workflow_name=&UserMetadata_Description=&submission_uuid=7497E3AC-0A75-4C7C-8C66-26294C9274FE&action=stop&version=2&camera_name=150-A%20Epiphan&controller=cameras&UserMetadata_Title=Test123
* Response :
<pre><podcast_producer_result>
<action>stop</action>
<status>success</status>
<results>OK</results>
</podcast_producer_result>
</pre>
* URL : https://pcpserver:8170/podcastproducer/recordings/create
* Type : POST
* Content : version=2&workflow_uuid=C6EF52A7-04E3-477D-9F38-6B61F108D7B9
* Response :
<pre>
<podcast_producer_result>
<action>create</action>
<status>success</status>
<results>OK</results>
<plist version="1.0">
<dict>
<key>workflow_uuid</key>
<string>C6EF52A7-04E3-477D-9F38-6B61F108D7B9</string>
<key>recording_uuid</key>
<string>FD5A1459-F7CE-41FA-8155-049DF774298B</string>
<key>submission_uuids</key>
<array>
<string>A626D8E4-E439-4E57-9982-DB4BD035CB41</string>
<string>CFBCCB74-A41F-42D3-BEAA-58165B1116C6</string>
</array>
</dict>
</plist>
</podcast_producer_result>
</pre> -
Joining realtime raw PCM streams with ffmpeg and streaming them back out
15 avril 2024, par Nathan LadwigI am trying to use ffmpeg to join two PCM streams. I have it sorta kinda working but it's not working great.


I am using Python to receive two streams from two computers running Scream Audio Driver ( ttps ://github.com/duncanthrax/scream )


I am taking them in over UDP and writing them to pipes. The pipes are being received by ffmpeg and mixed, it's writing the mixed stream to another pipe. I'm reading that back in Python and sending it to the target receiver.


My ffmpeg command is


['ffmpeg', 
'-use_wallclock_as_timestamps', 'true', '-f', 's24le', '-ac', '2', '-ar', '48000', '-i', '/tmp/ffmpeg-fifo-1',
'-use_wallclock_as_timestamps', 'true', '-f', 's24le', '-ac', '2', '-ar', '48000', '-i', '/tmp/ffmpeg-fifo-2',
'-filter_complex', '[0]aresample=async=1[a0],[1]aresample=async=1[a1],[a0][a1]amix', '-y',
'-f', 's24le', '-ac', '2', '-ar', '48000', '/tmp/ffmpeg-fifo-in']



My main issue is that it should be reading ffmpeg-fifo-1 and ffmpeg-fifo-2 asynchronously, but it appears to be not. When the buffers get more than 50 frames out of sync with each other ffmpeg hangs and doesn't recover. I would like to fix this.


In this hacky test code the number of frames sent over each stream are counted and empty frames are sent if the count hits 12. This keeps ffmpeg happy.


The code below takes in two 48KHz 24-bit stereo PCM streams with Scream's header, mixes them, applies the same header, and sends them back out.


It works most of the time. Sometimes I'm getting blasted with static, I think this is when only one or two bytes of a frame are making it to ffmpeg, and it loses track.


The header is always 1152 bytes of pcm data with a 5 byte header. It's described in the Scream repo readme


This is my header :


01 18 02 03 00


01 - 48KHz
18 - Sampling Rate (18h=24d, 24bit)
02 - 2 channels
03 00 - WAVEFORMATEXTENSIBLE


import socket
import struct
import threading
import os
import sys
import time
import subprocess
import tempfile
import select

class Sender(threading.Thread):
 def __init__(self):
 super().__init__()
 TEMPDIR = tempfile.gettempdir() + "/"
 self.fifoin = TEMPDIR + "ffmpeg-fifo-in"
 self.start()

 def run(self):
 self.fd = open(self.fifoin, "rb")
 self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 while True:
 try:
 header = bytes([0x01, 0x18, 0x02, 0x03, 0x00]) # 48khz, 24-bit, stereo
 data = self.fd.read(1152)
 sendbuf = header + data
 self.sock.sendto(sendbuf, ("192.168.3.199", 4010)) # Audio sink
 except Exception as e:
 print("Except")
 print(e)

class Receiver(threading.Thread):
 def __init__(self):
 super().__init__()
 TEMPDIR = tempfile.gettempdir() + "/"
 self.fifo1 = TEMPDIR + "ffmpeg-fifo-1"
 self.fifo2 = TEMPDIR + "ffmpeg-fifo-2"
 self.fifoin = TEMPDIR + "ffmpeg-fifo-in"
 self.fifos = [self.fifo1, self.fifo2]
 try:
 try:
 os.remove(self.fifoin)
 except:
 pass
 os.mkfifo(self.fifoin)
 except:
 pass
 self.start()
 sender=Sender()

 def run(self):
 ffmpeg_command=['ffmpeg', '-use_wallclock_as_timestamps', 'true', '-f', 's24le', '-ac', '2', '-ar', '48000', '-i', self.fifo1,
 '-use_wallclock_as_timestamps', 'true', '-f', 's24le', '-ac', '2', '-ar', '48000', '-i', self.fifo2,
 '-filter_complex', '[0]aresample=async=1[a0],[1]aresample=async=1[a1],[a0][a1]amix', "-y", '-f', 's24le', '-ac', '2', '-ar', '48000', self.fifoin]
 print(ffmpeg_command)

 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 sock.setsockopt(socket.SOL_SOCKET,socket.SO_RCVBUF,4096)
 sock.bind(("", 16401))

 recvbuf = bytearray(1157)
 framecount = [0,0]
 closed = 1
 while True:
 ready = select.select([sock], [], [], .2)
 if ready[0]:
 recvbuf, addr = sock.recvfrom(1157)
 if closed == 1:
 for fifo in self.fifos:
 try:
 try:
 os.remove(fifo)
 except:
 pass
 os.mkfifo(fifo)
 except:
 pass
 framecount = [0,0]
 print("data, starting ffmpeg")
 ffmpeg = subprocess.Popen (ffmpeg_command, shell=False, stdout=subprocess.PIPE, stdin=subprocess.PIPE)
 fifo1_fd = os.open(self.fifo1, os.O_RDWR)
 fifo1_file = os.fdopen(fifo1_fd, 'wb', 0)
 fifo2_fd = os.open(self.fifo2, os.O_RDWR)
 fifo2_file = os.fdopen(fifo2_fd, 'wb', 0)
 closed = 0
 for i in range(0,6):
 fifo1_file.write(bytes([0]*1157))
 fifo2_file.write(bytes([0]*1157))

 if addr[0] == "192.168.3.199":
 fifo1_file.write(recvbuf[5:])
 framecount[0] = framecount[0] + 1

 if addr[0] == "192.168.3.119":
 fifo2_file.write(recvbuf[5:])
 framecount[1] = framecount[1] + 1

 # Keep buffers roughly in sync while playing
 targetframes=max(framecount)
 if targetframes - framecount[0] > 11:
 while (targetframes - framecount[0]) > 0:
 fifo1_file.write(bytes([0]*1157))
 framecount[0] = framecount[0] + 1

 if targetframes - framecount[1] > 11:
 while (targetframes - framecount[1]) > 0:
 fifo2_file.write(bytes([0]*1157))
 framecount[1] = framecount[1] + 1
 else:
 if closed == 0:
 ffmpeg.kill()
 print("No data, killing ffmpeg")
 fifo1_file.close()
 fifo2_file.close()
 closed = 1
receiver=Receiver()

while True:
 time.sleep(50000)



Does anybody have any pointers on how I can make this better ?


-
Revision 30246 : Corrections de grosses boulettes sql Correction d’une boulette dans la ...
27 juillet 2009, par kent1@… — LogCorrections de grosses boulettes sql
Correction d’une boulette dans la déclaration des champs
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