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• Stream RAW8 video from camera using openCV and Python [Windows]

  14 novembre 2022, par awin

  We have a camera that streams RAW8 video at 1920x1080. The GUID used is GREY. We are able to stream video from this camera using ffmpeg on Windows with the below command :

  


  ffmpeg -f dshow -pix_fmt gray -video_size 1920x1080 -i video="CAM0" -f nut - | ffplay -


  


  We are now trying to grab images from this camera using OpenCV using the below code snippet, but its unable to grab any frame (frame_grabbed is always false)

  


  import cv2
import numpy as np

# reading the video from CAM0
source = cv2.VideoCapture(1)

height = 1920
width = 1080

source.set(cv2.CAP_PROP_FRAME_WIDTH, width)
source.set(cv2.CAP_PROP_FRAME_HEIGHT, height)


image = np.zeros([height, width, 3], np.uint8)

while True:
    # Extracting the frames
    frame_grabbed , image = source.read()

    if (frame_grabbed ):
        colour1 = cv2.cvtColor(image, cv2.COLOR_BayerRG2BGR)
        cv2.imshow("Demosaiced image", colour1)
    else:
        print("No images grabbed")

#Exit on q
    key = cv2.waitKey(1)
    if key == ord("q"):
       break

# closing the window
cv2.destroyAllWindows()
source.release()



  


  Are we missing something here ?

  


  We then came across this post to pipe ffmpeg output to python (link). However, when we are passing the command as below :

  


  command = [ 'ffmpeg.exe',
            '-f', 'dshow',
            '-i', 'video="CAM0"',
            '-pix_fmt', 'gray',
            '-video_size','1920x1080'
            '-f', 'nut', '-']


  


  its throwing

  


  


  Could not find video device with name ["CAM0"] among source devices
of type video. video="CAM0" : I/O error

  


  


  I have verified that the camera is present using the below command :

  


  command = [ 'ffmpeg.exe',
            '-list_devices', 'true',
            '-f', 'dshow',
            '-i', 'dummy']


  


  This detects CAM0 as shown below :

  


  ffmpeg version 5.0.1-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 11.2.0 (Rev7, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab 
--enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
  libpostproc    56.  3.100 / 56.  3.100
[dshow @ 000001ea39e40600] "HP HD Camera" (video)
[dshow @ 000001ea39e40600]   Alternative name "@device_pnp_\\?\usb#vid_04f2&pid_b6bf&mi_00#6&1737142c&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 000001ea39e40600] "CAM0" (video)
[dshow @ 000001ea39e40600]   Alternative name "@device_pnp_\\?\usb#vid_0400&pid_0011&mi_00#7&1affbd5b&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"


  


  In short, we are able to capture video using ffmpeg commandline, but unable to grab any frame using OpenCV videocapture or ffmpeg in opencv. Any pointers ?

  


  Thanks !

  


• Docker fails to import FFMPEG or does not find it

  8 décembre 2022, par stxss

  So I'm trying to create a telegram bot using python and ffmpeg and I want to deploy it to a server through a docker image.

  


  I already looked through a lot of resources as I've been looking at the same 5 lines of code for the past three days and neither discords, stack overflow previous answers have helped me.

  


  This is my dockerfile where half of the program works (apart from the ffmpeg functionality).

  


  FROM python:3.9

RUN mkdir /app
WORKDIR /app

COPY requirements.txt ./
RUN pip3 install --no-cache-dir --user -r requirements.txt

COPY . .

ENTRYPOINT ["/usr/bin/python3", "./app.py" ]


  


  With this code I get the following error when trying to use a function that invokes ffmpeg functionality.

  


  Traceback (most recent call last):
File "/root/.local/lib/python3.9/site-packages/pyrogram/dispatcher.py", line 240, in handler_worker
await handler.callback(self.client, *args)
File "/app/./app.py", line 274, in choice_from_inline
await helpers.trim_file(trim_length, "audio", chat_id_for_join.strip())
File "/app/helpers.py", line 53, in trim_file
output = ffmpeg.output(
File "/root/.local/lib/python3.9/site-packages/ffmpeg/_run.py", line 313, in run
process = run_async(
File "/root/.local/lib/python3.9/site-packages/ffmpeg/_run.py", line 284, in run_async
return subprocess.Popen(
File "/usr/lib/python3.9/subprocess.py", line 951, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib/python3.9/subprocess.py", line 1823, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'ffmpeg'


  


  Another issue is that when changing the ENTRYPOINT (or using CMD) to ["python3", "./app.py" ] everything works well locally but as soon as I try to deploy, the deployment/docker container just doesn't work or crash because I get the error of ModuleNotFoundError: No module named 'ffmpeg'.

  


  I have already tried setting up different ENV PATH and ENV PYTHONPATH, does absolutely nothing.
I have tried to use COPY --from=jrottenberg/ffmpeg /usr/local ./ and it also doesn't work.
I have tried to explicitly use RUN apt-get install -y ffmpeg and similar commands, pip, pip3, etc.. it just doesn't work.

  


  I tried to use the copy command to access the /root/.local/lib/python3.9/site-packages/ffmpeg/_run.py but I either get a permission denied or a file does not exist error.

  


  I am also using the ffmpeg-python wrapper and am using a windows machine if that's of any importance.

  


  At this point I'm contemplating of finding another way of implementing the functionality I want without using ffmpeg.

  


  I think I added everything I had, if needed more I can provide.

  


• Compress videofiles from context menu in Windows 11 using ffmpeg

  11 janvier 2023, par Rayearth

  I'd looking for an easy way to just right click on a folder in Windows and be able to loop through video files and compress them with ffmpeg with prepared command settings.

  


  Been able to prepare the reg file to import but I think I'm missing something important here (working directory reference I think). How should I pass the working dir path inside a command like that for this mechanism to work ?

  


  Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Directory\Shell\Compress_videos]
@="Compress videos"

[HKEY_CLASSES_ROOT\Directory\Shell\Compress_videos\command]
@="cmd /c for \"%E\" in (.mp4, .mkv, .mov, .avi) do forfiles /m *\"%E\" /c \"cmd /c C:\\Windows\\System32\\ffmpeg.exe -hide_banner -y -hwaccel cuda -i @path -c:v hevc_nvenc -b:v 8000k -c:a copy @fname_compressed.mp4\""