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• Play video using ffmpeg

  17 juin 2023, par MCD

  The following code stuck in the middle of the video. I want to play the video start at start_seconds and end at end_seconds.

  


  import subprocess
import cv2
import numpy as np
import subprocess

def play_video_with_ffmpeg(video_path, start_seconds, end_seconds):
print(start_seconds)

    # Set the desired frame size
    width = 920
    height = 600
    
    # Set the window position
    print("here")
    window_x = 600  # X position
    window_y = 10  # Y position
    cv2.namedWindow('Video Player', cv2.WINDOW_NORMAL)
    cv2.moveWindow('Video Player', window_x, window_y)
    
    # Build the ffmpeg command to skip to the desired start time and end time
    command = [
        'ffmpeg',
        '-ss', str(start_seconds),
        '-i', video_path,
        '-t', str((end_seconds - start_seconds)),
        '-vf', f'scale={width}:{height}',
        '-r', '30',
        '-f', 'image2pipe',
        '-pix_fmt', 'bgr24',
        '-vcodec', 'rawvideo',
        '-'
    ]
    
    # Open a subprocess to execute the ffmpeg command
    process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    
    # Create a buffer to hold the frame data
    buffer_size = width * height * 3
    frame_buffer = bytearray(buffer_size)
    
    while process.poll() is None:
        # Read the frame from the subprocess stdout into the buffer
        bytes_read = process.stdout.readinto(frame_buffer)
    
        if bytes_read == buffer_size:
            # Convert the frame buffer to a numpy array
            frame = np.frombuffer(frame_buffer, dtype='uint8').reshape((height, width, 3))
    
            # Resize the frame
            frame_resized = cv2.resize(frame, (width, height), interpolation=cv2.INTER_AREA)
    
            # Display the frame
            cv2.imshow('Video Player', frame_resized)
    
            if cv2.waitKey(1) & 0xFF == ord('q'):
                break
    
    process.stdout.close()
    process.stderr.close()
    cv2.destroyAllWindows()


  


  I expect to play the video start from start_second and end at end_second. I used cv2.set but it took long time to play from start_second.

  


• Play audio out through specific output device with ffplay

  4 février 2018, par ComedicChimera

  I just have a quick question regarding ffplay (extension of ffmpeg) for Windows. I am trying to get it to allow me to play audio out of specific device (ie. a virtual audio cable), and I cannot find any documentation on how to do it.

  Here is my current command :

  "ffplay -loglevel panic -nodisp -volume volume -i url"

  I could not find any documentation of how to do this.

  If it is not possible to do this ffplay, I would like to ask if there is away to set a specific audio output device in Python 3 (as that is the language I am using to call ffplay)

  Thanks

• System reboots during ffmpeg tool installation

  11 novembre 2016, par JeeBoomBaa

  I have enabled QSV with reference of the streambuilder’s enabling-iqsv docs.

  MACHINE DETAILS

  Server : Intel(R) Xeon(R) CPU E3-1285 v4 3.50GHz w/ Supermicro X10SLH-F

  Kernel : Linux 3.10.0-229.1.2.44985.MSSr7.el7.centos.x86_64 #1 SMP Wed Nov 9 16:26:25 PST 2016 x86_64 x86_64 x86_64 GNU/Linux

  I have installed ffmpeg with —enable-nonfree —enable-libmfx configurations, configuration command was successfully done.Then, I invoke make and our server gets hanged in few seconds and it will gets rebooted automatically.

  I feel it might be compilation issue with make script.

  ./configure --prefix="/usr/ffmpeg" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" --pkg-config-flags="--static" --enable-nonfree --enable-libmfx
  
  make 
  
  --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=2068, si_status=0, si_utime=0, si_stime=0} ---
  
  rt_sigreturn()                          = 2068
  
  rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM XCPU XFSZ], NULL, 8) = 0
  
  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
  
  stat("libavcodec/intrax8dsp.o", {st_mode=S_IFREG|0644, st_size=82840, ...}) = 0
  
  stat("libavcodec/ituh263dec.o", 0x7ffff86affb0) = -1 ENOENT (No such file or directory)
  
  stat("libavcodec/ituh263dec.c", {st_mode=S_IFREG|0644, st_size=38617, ...}) = 0
  
  rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM XCPU XFSZ], NULL, 8) = 0
  
  vfork()                                 = 2072
  
  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
  
  wait4(-1, CC libavcodec/ituh263dec.o

  I have attached config.log and FFMPEG-MAKE-TRACE.log file.