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• I created a Python code to capture live video using FFmpeg, but the output screen only shows noise

  16 octobre 2024, par chun3 hyun

  The code below is Python code that made my computer screen video capture in real time via ffmpeg.

  


  When I run the code below, it goes well until a new window named 'Captured Frame' is created. But this 'Captured Frame' window doesn't show the full screen of my computer, and the gray screen is generating a lot of noise.

  


  import cv2
import numpy as np
import subprocess

def frame_capture():
    # Set FFmpeg command (capture desired window or area)
    ffmpeg_command = [
        'ffmpeg',
        '-f', 'gdigrab',  # Windows screen capture (using gdigrab)
        '-framerate', '30',  # Setting the Frame Speed
        '-i', 'desktop',  # What to capture (for example, full screen)
        '-pix_fmt', 'bgr0',
        '-vcodec', 'rawvideo',  # Video codec settings
        '-tune', 'zerolatency',
        '-an',  # Disable audio
        '-sn',  # Disable Caption
        '-f', 'rawvideo', '-'
    ]

    # Running the FFmpeg process
    process = subprocess.Popen(ffmpeg_command, stdout=subprocess.PIPE, bufsize=10**8)

    while True:
        # Read Frame from FFmpeg (Resolution Example: 1920x1080)
        raw_frame = process.stdout.read(1920 * 1080 * 3)  # 1920x1080 resolution, BGR format
        if not raw_frame:
            break  # Shut down the loop when you can no longer receive frames

        # Converting frame data to a numpy array
        frame = np.frombuffer(raw_frame, np.uint8).reshape((1080, 1920, 3))

        # Add frame processing code here
        # Example: Showing a frame on the screen
        cv2.imshow('Captured Frame', frame)

        # Press the 'q' key to end
        if cv2.waitKey(1) & 0xFF == ord('q'):
            break

    # End of process and release of resources
    process.stdout.close()
    process.wait()
    cv2.destroyAllWindows()
frame_capture()


  


  What could I have done wrong ? When I directly input the FFmpeg command in the Windows command prompt(knows as 'cmd') as shown below to save the video (in .mp4 format), I can see that the screen is output normally in the saved file. It seems that FFmpeg itself is installed correctly, but I don't know what the cause is.

  


  hwnd=132554 -pix_fmt yuv420p -vf "scale=iw-mod(iw\,2):ih-mod(ih\,2)" -draw_mouse 1 -t 10 output.mp4


  


  The handle number written above was the handle of the active Chrome window on my computer.

  


  My ffmpeg version is 2024-10-10-git-0f5592cfc7-full_build-www.gyan.dev My Python version is 3.12.4
My Windows version and build are as specified below.
:Windows 11 Home, 10.0.22631

  


  Capturing the computer screen with FFmpeg. I tried it, but the output screen shows only noise.

  


• avformat : remove deprecated FF_API_GET_DUR_ESTIMATE_METHOD

  19 février, par James Almer

  avformat : remove deprecated FF_API_GET_DUR_ESTIMATE_METHOD
  Deprecated since 2024-03-06.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/avformat.h
  • [DH] libavformat/options.c
  • [DH] libavformat/version_major.h

• "Error opening input" error when running ffmpeg via shell script

  15 octobre 2024, par Roni Yaniv

  I'm on a macbook running sonoma 14.7.

  


  I have the following ffmpeg command which runs just fine by itself in the same folder of the files I need to modify :

  


  ffmpeg -i "water-stream-90fps.mp4" -vf "drawtext=text='Frame\: %{frame_num}': start_number=1: x=(w-text_w): y=(h-text_h):fontsize=(h*10/100):fontcolor=yellow,drawtext=text='%{pts\:hms}':x=0:y=0:fontsize=(h*10/100):fontcolor=yellow" "water-stream-90fps-with-markers.mp4"

  


  However, when I try to use it in a shell script by running ./add_markers.sh in the same folder, I get an error.

  


  This is the add_markers.sh script :

  


  #!/bin/bash

# Replace '/path/to/your/folder' with the actual path to your folder
folder=$(pwd)

# Replace 'ffmpeg -i input.mp4 -vf scale=640:480 output.mp4' with your desired FFmpeg command
ffmpeg_command="ffmpeg -i input.mp4 -vf \"drawtext=text='Frame\: %{frame_num}': start_number=1: x=(w-text_w): y=(h-text_h):fontsize=(h*10/100):fontcolor=yellow,drawtext=text='%{pts\:hms}':x=0:y=0:fontsize=(h*10/100):fontcolor=yellow\" output.mp4"

echo "$ffmpeg_command"

# Loop through all files in the folder and execute the FFmpeg command

for file in "$folder"/*; do
    filename=$(basename "${file%.*}") #get only the first part of the file name without path or extension

    # Replace 'input.mp4' with the current filename and 'output.mp4' with the new filename. 
    # Added double quotes to manage filenames with spaces.
    new_command="${ffmpeg_command//input.mp4/\"$filename.mp4\"}"
    new_command="${new_command//output.mp4/\"$filename-with-markers.mp4\"}"

    echo "Running $new_command"

    $new_command

done


  


  This is the error I get (for one of the files, same error for all of them) :

  


  Running ffmpeg -i "water-stream-90fps.mp4" -vf "drawtext=text='Frame\: %{frame_num}': start_number=1: x=(w-text_w): y=(h-text_h):fontsize=(h*10/100):fontcolor=yellow,drawtext=text='%{pts\:hms}':x=0:y=0:fontsize=(h*10/100):fontcolor=yellow" "water-stream-90fps-with-markers.mp4"
ffmpeg version 7.0 Copyright (c) 2000-2024 the FFmpeg developers
  built with Apple clang version 15.0.0 (clang-1500.3.9.4)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      59.  8.100 / 59.  8.100
  libavcodec     61.  3.100 / 61.  3.100
  libavformat    61.  1.100 / 61.  1.100
  libavdevice    61.  1.100 / 61.  1.100
  libavfilter    10.  1.100 / 10.  1.100
  libswscale      8.  1.100 /  8.  1.100
  libswresample   5.  1.100 /  5.  1.100
  libpostproc    58.  1.100 / 58.  1.100
[in#0 @ 0x6000015bc300] Error opening input: No such file or directory
Error opening input file "water-stream-90fps.mp4".
Error opening input files: No such file or directory


  


  I tried all kinds of things but my brain is starting to swell. Any guidance/help would be appreciated.