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• Streams stop when creating a quad split Multi-viewer using FFMPEG [closed]

  6 avril 2024, par Chris Parker

  Created a FFMPEG script that takes in 4 SRT Live Streams and displays them in a quad split MV. However when I launch this script all 4 SRT streams will play but 3 will pause and 1 will play.

  


  ffmpeg \
-re -hwaccel auto -hwaccel_output_csp videocore \
-stream_loop -1 \
-i "srt://address:5000?streamid=stream-id" \
-stream_loop -1 \
-i "srt://address:5000?streamid=stream-id" \
-stream_loop -1 \
-i "srt://address:5000?streamid=stream-id" \
-stream_loop -1 \
-i "srt://address:5000?streamid=stream-id" \
-filter_complex "\
[0]scale=1920x1080,setdar=16/9[a];\
[1]scale=1920x1080,setdar=16/9[b];\
[2]scale=1920x1080,setdar=16/9[c];\
[3]scale=1920x1080,setdar=16/9[d];\
[a][b][c][d]xstack=inputs=4:layout=0_0|w0_0|0_h0|w0_h0[v]" \
-map "[v]" \
-c:v libx264 -preset veryfast -crf 28 \
-pix_fmt yuv420p -g 48 -bf 2 -refs 4 \
-f mpegts -b:v 10M -maxrate:v 15M -bufsize:v 30M \
-fflags +discardcorrupt -reset_timestamps 1 \
"srt://address:5000?streamid=stream-id"


  


  getting a lot of the below error ;

  


  16:48:49.628704/SRT:RcvQ:w2!W:SRT.qr: @214003038:No room to store incoming packet seqno 649744568, insert offset 7190. Space avail 0/8192 pkts. (TSBPD ready in -12342ms, timespan 6093 ms). GETTIME_MONOTONIC drift 0 ms.


  


  I've tried smaller resolution and adjusting buffer sizes as well as the other flags but I'm not sure what else I can do.

  


• Traceback error with Python when using ffmpeg to convert a video

  16 mai 2013, par TheMickeyNick

  The simple way my script runs is the user provides a folder location and a filetype and glob.glob() finds the files with the filetype provided and adds them to a list. It then uses a for loop and goes through the list and converts each video. But it doesn't like when I try to run my ffmpeg command. Any help would be awesome. I'm also using Win 7 64 bit with 64 bit ffmpeg and Python 3.3
  Here's the error :

  OS Error
  
  Traceback (most recent call last):
  
    File "C:\Python33\lib\subprocess.py", line 1106, in _execute_child
  
      startupinfo)
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  
  
  During handling of the above exception, another exception occurred:
  
  
  
  Traceback (most recent call last):
  
    File "C:\Users\user\Workspace\PythonConverter\HTMLandPythonConverter\Converter.py", line 77, in <module>
  
      massConvert(fileNames)
  
    File "C:\Users\user\Workspace\PythonConverter\HTMLandPythonConverter\Converter.py", line 47, in massConvert
  
      convertVideotoNewFormat(&#39;.mp4&#39;, x)
  
    File "C:\Users\user\Workspace\PythonConverter\HTMLandPythonConverter\Converter.py", line 61, in convertVideotoNewFormat
  
      myFile = subprocess.Popen(ffmpegString)#, stdout=subprocess.PIPE, stderr=subprocess.PIPE
  
    File "C:\Python33\lib\subprocess.py", line 820, in __init__
  
      restore_signals, start_new_session)
  
    File "C:\Python33\lib\subprocess.py", line 1112, in _execute_child
  
      raise WindowsError(*e.args)
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  </module>

  Here is my code :

  import subprocess
  
  from subprocess import call
  
  import glob
  
  
  
  fileNames = []
  
  fileLocation = {}
  
  filetype = {}
  
  def convertString(location):
  
      s = list(location)
  
      for i in range(len(s)):
  
          if s[i] in '\\':
  
              s[i] = '/'
  
  
  
      if s[len(s)-1] != '/':
  
          s.append('/')
  
      location = "".join(s)
  
      return location
  
  
  
  def convertStringBack(stringTo):
  
      s = list(stringTo)
  
      for i in range(len(s)):
  
          if s[i] in '/':
  
              s[i] = '\\'
  
      stringTo = "".join(s)
  
      return stringTo
  
  
  
  def fileTypeTester():
  
      FieldType = '*' + input('What\'s the file type we are converting from?')
  
      typeSplit = list(FieldType)
  
      if typeSplit[1] != '.':
  
          typeSplit.insert(1,'.')
  
      FieldType = "".join(typeSplit)
  
      if FieldType not in ['*.flv','*.kdb']:
  
          print('Not a valid file type')
  
      else:
  
          return FieldType
  
      return None
  
  
  
  def massConvert(listOfFiles):
  
      print('Starting Conversion')
  
      for x in listOfFiles:
  
          #x = convertStringBack(x)
  
          print('Converting ' + x + ' to .mp4')
  
          convertVideotoNewFormat('.mp4', x)
  
      print('Finished File Conversion')
  
  
  
  
  
  def convertVideotoNewFormat(newFormat, fileLoc):
  
      newFilePath = fileLoc[0:len(fileLoc)-4]
  
      ffmpegString = ["ffmpeg64","-i", fileLoc,"-qscale","0","-ar","22050","-vcodec","libx264",newFilePath,newFormat]
  
      try:
  
          subprocess.check_call(newFilePath)
  
      except OSError:
  
          print('OS Error')
  
      except subprocess.CalledProcessError:
  
          print('Subprocess Error')
  
      myFile = subprocess.Popen(ffmpegString)
  
      print(myFile)
  
  
  
  #This will replace old HTML flv object tag with new video tag, but it is yet to be implemented
  
  def replaceHTML():
  
      pass
  
  
  
  fileLocation = input('What is the path of the files you\'d like to convert?')
  
  fileLocation = convertString(fileLocation)
  
  fileType = fileTypeTester()
  
  fileNames = glob.glob(fileLocation + fileType)
  
  massConvert(fileNames)

  I've looked around and most of the tutorials are in 2.7 the code is 3.3 and I can't find a tutorial to use ffmpeg for 3.3. My ffmpeg is set to 'ffmpeg64' on my PATH.

  Thanks !

• MacOS - how to choose audio device from terminal

  9 octobre 2024, par jon_two

  I've been working on a Python program to create audio and also play back existing sound files. I can spawn multiple processes and have them all play to the laptop speakers, but I was wondering if it was possible to send each signal to a separate sound device. This is so I can apply effects to some processes but not all together.

  


  I'm using a MacBook and python simpleaudio, which calls AudioToolbox to connect to the output device. I've also got ffmpeg installed, so could use ffplay if that is easier. The pydub library uses this - it exports the current wave to a temp file then uses subprocess and ffplay to play it back.

  


  I can get a list of devices, but am not sure how to use this list to choose a device.

  


  % ffplay -devices
Devices:
 D. = Demuxing supported
 .E = Muxing supported
 --
  E audiotoolbox    AudioToolbox output device
 D  avfoundation    AVFoundation input device
 D  lavfi           Libavfilter virtual input device
  E sdl,sdl2        SDL2 output device
 D  x11grab         X11 screen capture, using XCB


  


  I did see a post that suggested using ffmpeg to list devices, again I can't figure out how to use this list.

  


  % ffmpeg -f lavfi -i sine=r=44100 -f audiotoolbox -list_devices true -
Input #0, lavfi, from 'sine=r=44100':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
  Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
[AudioToolbox @ 0x135e3f230] CoreAudio devices:
[AudioToolbox @ 0x135e3f230] [0]               Background Music, (null)
[AudioToolbox @ 0x135e3f230] [1]   Background Music (UI Sounds), BGMDevice_UISounds
[AudioToolbox @ 0x135e3f230] [2]         MacBook Air Microphone, BuiltInMicrophoneDevice
[AudioToolbox @ 0x135e3f230] [3]           MacBook Air Speakers, BuiltInSpeakerDevice
[AudioToolbox @ 0x135e3f230] [4]               Aggregate Device, ~:AMS2_Aggregate:0
Output #0, audiotoolbox, to 'pipe:':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
    Metadata:
      encoder         : Lavc59.37.100 pcm_s16le
size=N/A time=00:00:05.06 bitrate=N/A speed=0.984x    
video:0kB audio:436kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Exiting normally, received signal 2.


  


  This does at least give me a recognisable list of devices. If I add more Aggregate Devices, can I play back different files to each device ?