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• Non-blocking realtime read from multiple shell subprocesses (Python)

  8 février 2018, par Norman Edance

  I’m building real time multiple videostream monitoring using ffmpeg and subrocess.
  I currently have the following code, inspired by "Async and await with subprocesses" post.

  The problem is that after a certain period of time the output stops printing and the processes go into zombie mode. I guess that this problem is related to the overload of PIPE or deadlock. Help needed.

  """Async and await example using subprocesses
  
  
  
  Note:
  
      Requires Python 3.6.
  
  """
  
  
  
  import os
  
  import sys
  
  import time
  
  import platform
  
  import asyncio
  
  
  
  async def run_command_shell(command):
  
      """Run command in subprocess (shell)
  
  
  
      Note:
  
          This can be used if you wish to execute e.g. "copy"
  
          on Windows, which can only be executed in the shell.
  
      """
  
      # Create subprocess
  
      process = await asyncio.create_subprocess_shell(
  
          command,
  
          stderr=asyncio.subprocess.PIPE)
  
  
  
      # Status
  
      print('Started:', command, '(pid = ' + str(process.pid) + ')')
  
  
  
      # Wait for the subprocess to finish
  
      stdout, stderr = await process.communicate()
  
  
  
      # Progress
  
      if process.returncode == 0:
  
          print('Done:', command, '(pid = ' + str(process.pid) + ')')
  
      else:
  
          print('Failed:', command, '(pid = ' + str(process.pid) + ')')
  
  
  
      # Result
  
      result = stderr.decode().strip()
  
  
  
      # Real time print
  
      print(result)
  
  
  
      # Return stdout
  
      return result
  
  
  
  
  
  def make_chunks(l, n):
  
      """Yield successive n-sized chunks from l.
  
  
  
      Note:
  
          Taken from https://stackoverflow.com/a/312464
  
      """
  
      if sys.version_info.major == 2:
  
          for i in xrange(0, len(l), n):
  
              yield l[i:i + n]
  
      else:
  
          # Assume Python 3
  
          for i in range(0, len(l), n):
  
              yield l[i:i + n]
  
  
  
  
  
  def run_asyncio_commands(tasks, max_concurrent_tasks=0):
  
      """Run tasks asynchronously using asyncio and return results
  
  
  
      If max_concurrent_tasks are set to 0, no limit is applied.
  
  
  
      Note:
  
          By default, Windows uses SelectorEventLoop, which does not support
  
          subprocesses. Therefore ProactorEventLoop is used on Windows.
  
          https://docs.python.org/3/library/asyncio-eventloops.html#windows
  
      """
  
  
  
      all_results = []
  
  
  
      if max_concurrent_tasks == 0:
  
          chunks = [tasks]
  
      else:
  
          chunks = make_chunks(l=tasks, n=max_concurrent_tasks)
  
  
  
      for tasks_in_chunk in chunks:
  
          if platform.system() == 'Windows':
  
              loop = asyncio.ProactorEventLoop()
  
              asyncio.set_event_loop(loop)
  
          else:
  
              loop = asyncio.get_event_loop()
  
  
  
          commands = asyncio.gather(*tasks_in_chunk)  # Unpack list using *
  
          results = loop.run_until_complete(commands)
  
          all_results += results
  
          loop.close()
  
      return all_results
  
  
  
  
  
  if __name__ == '__main__':
  
  
  
      start = time.time()
  
  
  
      if platform.system() == 'Windows':
  
          # Commands to be executed on Windows
  
          commands = [
  
              ['hostname']
  
          ]
  
      else:
  
          # Commands to be executed on Unix
  
          commands = [
  
              ['du', '-sh', '/var/tmp'],
  
              ['hostname'],
  
          ]
  
      cmds = [["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx  -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx  -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx  -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx  -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx  -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx  -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx -f null -"],
  
              ["ffmpeg -y -i udp://xxx.xx.xx.xxx:xxxx -f null -"]]
  
  
  
      tasks = []
  
      for command in cmds:
  
          tasks.append(run_command_shell(*command))
  
  
  
  
  
      # # Shell execution example
  
      # tasks = [run_command_shell('copy c:/somefile d:/new_file')]
  
  
  
      # # List comprehension example
  
      # tasks = [
  
      #     run_command(*command, get_project_path(project))
  
      #     for project in accessible_projects(all_projects)
  
      # ]
  
  
  
      results = run_asyncio_commands(tasks, max_concurrent_tasks=20)  # At most 20 parallel tasks
  
      print('Results:', results)
  
  
  
      end = time.time()
  
      rounded_end = ('{0:.4f}'.format(round(end-start,4)))
  
      print('Script ran in about', str(rounded_end), 'seconds')

  Related : Non-blocking read from multiple subprocesses (Python)

• how would i play a large list of mp3 and wav files while showing the name of it on the screen with ffmpeg

  4 juillet 2023, par iiDk

  i've been attempting to make a video that is autogenerated using ffmpeg that plays a list of audios and while they are playing it shows the name of the audio file on the screen. i have no idea how to use ffmpeg and i abused ai for the provided script, but it's stupid and doesn't know how to properly reencode the file fixing the bugs at the end which cause the audio to only be on the left channel for no reason and then eventually cutting out.

  


  import os
import subprocess

def create_combined_video(audio_folder, output_path):
    # Get a list of audio files in the specified folder
    audio_files = []
    for filename in os.listdir(audio_folder):
        if filename.endswith(".mp3") or filename.endswith(".wav"):
            audio_files.append(os.path.join(audio_folder, filename))

    # Sort the audio files alphabetically
    audio_files.sort()

    # Create a folder to store the temporary image frames
    temp_frames_folder = "temp_frames"
    os.makedirs(temp_frames_folder, exist_ok=True)

    # Generate the image frames with the corresponding audio file names
    for index, audio_file in enumerate(audio_files):
        name = os.path.splitext(os.path.basename(audio_file))[0]
        image_path = os.path.join(temp_frames_folder, f"{index+1:06d}.jpg")

        # Use FFmpeg to create the image frame with text overlay
        ffmpeg_cmd = f'ffmpeg -y -f lavfi -i color=c=white:s=720x480:d=1 -vf "drawtext=text=\'{name}\':fontcolor=black:fontsize=36:x=(w-text_w)/2:y=(h-text_h)/2" -vframes 1 "{image_path}"'
        subprocess.run(ffmpeg_cmd, shell=True)

    # Generate a text file containing the image file names for each audio
    image_names_path = "image_names.txt"
    with open(image_names_path, "w") as file:
        for index, audio_file in enumerate(audio_files):
            image_path = os.path.join(temp_frames_folder, f"{index+1:06d}.jpg")
            duration = get_audio_duration(audio_file)
            file.write(f"file '{image_path}'\nduration {duration}\n")

    # Generate a text file containing the audio file names
    audio_names_path = "audio_names.txt" 
    with open(audio_names_path, "w") as file:
        for audio_file in audio_files:
            file.write(f"file '{audio_file}'\n")

    # Re-encode the audio files with a common codec (AAC)
    reencoded_audio_folder = "reencoded_audio"
    os.makedirs(reencoded_audio_folder, exist_ok=True)
    for index, audio_file in enumerate(audio_files):
        reencoded_audio_file = os.path.join(reencoded_audio_folder, f"{index:03d}.m4a")
        ffmpeg_cmd = f'ffmpeg -y -i "{audio_file}" -c:a aac "{reencoded_audio_file}"'
        subprocess.run(ffmpeg_cmd, shell=True)

    # Generate a text file containing the re-encoded audio file names
    reencoded_audio_names_path = "reencoded_audio_names.txt"
    with open(reencoded_audio_names_path, "w") as file:
        for index, audio_file in enumerate(audio_files):
            reencoded_audio_file = os.path.join(reencoded_audio_folder, f"{index:03d}.m4a")
            file.write(f"file '{reencoded_audio_file}'\n")

    # Use FFmpeg to generate the video with the image frames and re-encoded audio
    ffmpeg_cmd = f'ffmpeg -y -f concat -safe 0 -i "{image_names_path}" -f concat -safe 0 -i "{reencoded_audio_names_path}" -c:v libx264 -pix_fmt yuv420p -vf "scale=720:480:force_original_aspect_ratio=increase,crop=720:480" -c:a aac -shortest "{output_path}"'
    subprocess.run(ffmpeg_cmd, shell=True)

    # Clean up temporary files and folders
    os.remove(image_names_path)
    os.remove(audio_names_path)
    for image_file in os.listdir(temp_frames_folder):
        os.remove(os.path.join(temp_frames_folder, image_file))
    os.rmdir(temp_frames_folder)
    for audio_file in os.listdir(reencoded_audio_folder):
        os.remove(os.path.join(reencoded_audio_folder, audio_file))
    os.rmdir(reencoded_audio_folder)

def get_audio_duration(audio_file): 
    # Use FFprobe to get the duration of the audio file
    ffprobe_cmd = f'ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "{audio_file}"'
    result = subprocess.run(ffprobe_cmd, shell=True, capture_output=True, text=True)
    duration = float(result.stdout.strip())
    return duration

# Usage example
audio_folder = "C:/Users/Admin/Desktop/Sounds"
output_path = "C:/Users/Admin/Desktop/output.mp4"
create_combined_video(audio_folder, output_path)


  


  i've tried yelling at ai to fix the bug and all it does is break the script instead of doing what i asked it to, but i believe all it has to do is fix reencoding

  


• link error Xcode libx264.a ARM

  19 novembre 2013, par user1558688

  I'm trying to build libx264.a to run on my iphone 4s ( running iOS 6.1.3 )

  I'm building it using the MACOSX 10.9 Terminal application :

  CC=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang ./configure 
  
  --host=arm-apple-darwin 
  
  --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk 
  
  --prefix=armv7 
  
  --extra-cflags='-no-integrated-as -arch armv7' 
  
  --extra-ldflags="-L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/lib/system -arch armv7" 
  
  --enable-pic --enable-static

  Which guives me the output :

  platform:      ARM
  
  system:        MACOSX
  
  cli:           yes
  
  libx264:       internal
  
  shared:        no
  
  static:        yes
  
  asm:           yes
  
  interlaced:    yes
  
  avs:           avxsynth
  
  lavf:          no
  
  ffms:          no
  
  mp4:           no
  
  gpl:           yes
  
  thread:        posix
  
  opencl:        yes
  
  filters:       crop select_every 
  
  debug:         no
  
  gprof:         no
  
  strip:         no
  
  PIC:           yes
  
  bit depth:     8
  
  chroma format: all

  Then I run 'make' and it generates a libx264.a archive.

  So far, so good.

  On my Xcode (Version 5.0.2 (5A3005)) application I set :

  1) Build Settings -> Header Search Path -> x264 parent directory (../x264 )
  2) Build Phases -> Link Library with Binaries -> Add Other... ( ../x264/libx264.a )
  3) Build Settings -> Other Linker Flags : -ObjC

  In my AppDelegate.mm :

  #import "AppDelegate.h"
  
  #import "x264.h"
  
  
  
  @implementation AppDelegate
  
  
  
  - (BOOL)application:(UIApplication *)application 
  
  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
  
  {    
  
      x264_param_t x264param;
  
      x264_param_default(&x264param);
  
  
  
      // Override point for customization after application launch.
  
      return YES;
  
  }
  
  
  
  ...

  When i try to run it on the device I get the error :

  Undefined symbols for architecture armv7:
  
    "x264_param_default(x264_param_t*)", referenced from:
  
    -[AppDelegate application:didFinishLaunchingWithOptions:] in AppDelegate.o
  
  ld: symbol(s) not found for architecture armv7
  
  clang: error: linker command failed with exit code 1 
  
  (use -v to see invocation)

  Here is the command invoked by xcode :

  Ld /Users/danieldantas/Library/Developer/Xcode/DerivedData/testingCpp-bvawshyhjcybwvadwwwjqxuomjts/Build/Products/Debug-iphoneos/testingCpp.app/testingCpp normal armv7
  
  cd /Users/danieldantas/Desktop/projects/testingCpp
  
  setenv IPHONEOS_DEPLOYMENT_TARGET 6.0
  
  setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
  
  /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch armv7 -isysroot 
  
  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk 
  
  -L/Users/danieldantas/Library/Developer/Xcode/DerivedData/testingCpp-bvawshyhjcybwvadwwwjqxuomjts/Build/Products/Debug-iphoneos 
  
  -L/Users/danieldantas/Desktop/projects/testingCpp -L/Users/danieldantas/Desktop/projects/x264 
  
  -F/Users/danieldantas/Library/Developer/Xcode/DerivedData/testingCpp-bvawshyhjcybwvadwwwjqxuomjts/Build/Products/Debug-iphoneos 
  
  -filelist /Users/danieldantas/Library/Developer/Xcode/DerivedData/testingCpp-bvawshyhjcybwvadwwwjqxuomjts/Build/Intermediates/testingCpp.build/Debug-iphoneos/testingCpp.build/Objects-normal/armv7/testingCpp.LinkFileList 
  
  -dead_strip -ObjC -stdlib=libc++ -fobjc-arc -fobjc-link-runtime -miphoneos-version-min=6.0 -lx264 -framework CoreGraphics -framework UIKit -framework Foundation -Xlinker -dependency_info -Xlinker 
  
  /Users/danieldantas/Library/Developer/Xcode/DerivedData/testingCpp-bvawshyhjcybwvadwwwjqxuomjts/Build/Intermediates/testingCpp.build/Debug-iphoneos/testingCpp.build/Objects-normal/armv7/testingCpp_dependency_info.dat -o 
  
  /Users/danieldantas/Library/Developer/Xcode/DerivedData/testingCpp-bvawshyhjcybwvadwwwjqxuomjts/Build/Products/Debug-iphoneos/testingCpp.app/testingCpp

  Any idea how to fix this ?

  Thanks