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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.

  


• How to Identify the Version of ffmpeg.dll in WebView2 Runtime Fixed Version

  19 février, par Po-Sen

  I am currently using the WebView2 runtime fixed version. After expanding the package, I found multiple DLL files, including ffmpeg.dll.

  


  In the file properties, the file version is displayed as 0.0.0.0, and the only version-related information I can see is the product version : git-2024-04-25-e3581fa2dd.

  


  

  


  This format is different from the numeric versioning scheme I see on the official FFmpeg website : https://ffmpeg.org/download.html#releases.

  


  

  


  I want to trace the exact FFmpeg version used in this WebView2 distribution.
Initially, I assumed e3581fa2dd was a Git commit SHA. However, after cloning the FFmpeg repository from https://git.ffmpeg.org/ffmpeg.git, I could not find this commit.

  


  Our product was recently scanned and found to contain FFmpeg version 3.4.2, which has known CVE security vulnerabilities. Therefore, we want to clarify the actual version of FFmpeg included in the WebView2 runtime.

  


  How can I determine the version of ffmpeg.dll included in WebView2 runtime fixed version ?

  


• ffmpeg fialing with "could not find coded parameters"

  21 octobre 2024, par Angelo

  running ffmpeg -i in a C# console app using Process, for certain files, the process gets stuck and runs forever

  


          var oInfo = new ProcessStartInfo("ffmpeg.exe", "-i 176d2819-f1da-44eb-b33b-94eb1448194b.mov");
        oInfo.UseShellExecute = false;
        oInfo.CreateNoWindow = true;
        oInfo.RedirectStandardOutput = true;
        oInfo.RedirectStandardError = true;

        string output = string.Empty;
        StreamReader srOutput = null;

            //run the process
            Process proc = Process.Start(oInfo);
            proc.WaitForExit();
            srOutput = proc.StandardError;
            output = srOutput.ReadToEnd();
            proc.Close();


  


  running from command line

  


  ffmpeg.exe -i 176d2819-f1da-44eb-b33b-94eb1448194b.mov, getting an error as included in the below output

  


  could not find codec parameters for stream 1 (Audio : none (apac / 0x63617061), 48000 Hz, 4 channels, 382 kb/s) : unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[aist#0:1/none @ 0000029b0e1b0040] Guessed Channel Layout : 4.0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '176d2819-f1da-44eb-b33b-94eb1448194b.mov'

  


  ffmpeg version N-117538-g9ce63e65d6-20241015 Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 14.2.0 (crosstool-NG 1.26.0.120_4d36f27)
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-libxml2 --enable-lzma --enable-fontconfig --enable-libharfbuzz --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --enable-libdvdread --enable-libdvdnav --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libaribcaption --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-libzmq --enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --enable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libvvenc --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-libs=-lgomp --extra-ldflags=-pthread --extra-ldexeflags= --cc=x86_64-w64-mingw32-gcc --cxx=x86_64-w64-mingw32-g++ --ar=x86_64-w64-mingw32-gcc-ar --ranlib=x86_64-w64-mingw32-gcc-ranlib --nm=x86_64-w64-mingw32-gcc-nm --extra-version=20241015
  libavutil      59. 43.100 / 59. 43.100
  libavcodec     61. 22.100 / 61. 22.100
  libavformat    61.  9.100 / 61.  9.100
  libavdevice    61.  4.100 / 61.  4.100
  libavfilter    10.  6.100 / 10.  6.100
  libswscale      8.  6.100 /  8.  6.100
  libswresample   5.  4.100 /  5.  4.100
  libpostproc    58.  4.100 / 58.  4.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001b447c84e40] Could not find codec parameters for stream 1 (Audio: none (apac / 0x63617061), 48000 Hz, 4 channels, 382 kb/s): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
[aist#0:1/none @ 000001b44a6bf880] Guessed Channel Layout: 4.0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '176d2819-f1da-44eb-b33b-94eb1448194b.mov':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2024-10-14T07:34:17.000000Z
    com.apple.quicktime.full-frame-rate-playback-intent: 0
    com.apple.quicktime.make: Apple
    com.apple.quicktime.model: iPhone 16 Pro Max
    com.apple.quicktime.software: 18.0.1
    com.apple.quicktime.creationdate: 2024-10-14T16:18:36+1100
    com.apple.photos.originating.signature: AQMNJRMQrKK7im+Kjhixx6TqQyYm
  Duration: 00:00:32.60, start: 0.000000, bitrate: 15064 kb/s
  Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 130 kb/s (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: none (apac / 0x63617061), 48000 Hz, 4.0, 382 kb/s
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:2[0x3](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1920x1080, 14464 kb/s, 30 fps, 30 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
      encoder         : H.264
  Stream #0:3[0x4](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Metadata
  Stream #0:4[0x5](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Metadata
  Stream #0:5[0x6](und): Data: none (mebx / 0x7862656D), 21 kb/s (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Metadata
  Stream #0:6[0x7](und): Data: none (mebx / 0x7862656D), 48 kb/s (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Metadata
  Stream #0:7[0x8](und): Data: none (mebx / 0x7862656D), 2 kb/s (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Metadata
  Stream #0:8[0x9](und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2024-10-14T07:34:17.000000Z
      handler_name    : Core Media Metadata


  


  This error does not happen on all files but only on a handful of files.