I'd like to record the screen with ffmpeg as it seems to be the only player out there who can record a region of the screen along with the mouse cursor.
The following code was adapted from i want to display mouse pointer in my recording but it doesn't work on a Windows 10 (x64) setup (using Python 3.6).
#!/usr/bin/env python3
# ffmpeg -y -pix_fmt bgr0 -f avfoundation -r 20 -t 10 -i 1 -vf scale=w=3840:h=2160 -f rawvideo /dev/null
import sys
import cv2
import time
import subprocess
import numpy as np
w,h = 100, 100
def ffmpegGrab():
"""Generator to read frames from ffmpeg subprocess"""
#ffmpeg -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 640x480 -show_region 1 -i desktop output.mkv #CODE THAT ACTUALLY WORKS WITH FFMPEG CLI
cmd = 'D:/Downloads/ffmpeg-20200831-4a11a6f-win64-static/ffmpeg-20200831-4a11a6f-win64-static/bin/ffmpeg.exe -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 100x100 -show_region 1 -i desktop -f image2pipe, -pix_fmt bgr24 -vcodec rawvideo -an -sn'
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True)
#out, err = proc.communicate()
while True:
frame = proc.stdout.read(w*h*3)
yield np.frombuffer(frame, dtype=np.uint8).reshape((h,w,3))
# Get frame generator
gen = ffmpegGrab()
# Get start time
start = time.time()
# Read video frames from ffmpeg in loop
nFrames = 0
while True:
# Read next frame from ffmpeg
frame = next(gen)
nFrames += 1
cv2.imshow('screenshot', frame)
if cv2.waitKey(1) == ord("q"):
break
fps = nFrames/(time.time()-start)
print(f'FPS: {fps}')
cv2.destroyAllWindows()
out.release()
By using 'cmd' as stated above, I'll get the following error:
b"ffmpeg version git-2020-08-31-4a11a6f Copyright (c) 2000-2020 the FFmpeg developers\r\n built with gcc 10.2.1 (GCC) 20200805\r\n configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --enable-libsvtav1 --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf\r\n libavutil 56. 58.100 / 56. 58.100\r\n libavcodec 58.101.101 / 58.101.101\r\n libavformat 58. 51.101 / 58. 51.101\r\n libavdevice 58. 11.101 / 58. 11.101\r\n libavfilter 7. 87.100 / 7. 87.100\r\n libswscale 5. 8.100 / 5. 8.100\r\n libswresample 3. 8.100 / 3. 8.100\r\n libpostproc 55. 8.100 / 55. 8.100\r\nTrailing option(s) found in the command: may be ignored.\r\n[gdigrab @ 0000017ab857f100] Capturing whole desktop as 100x100x32 at (10,20)\r\nInput #0, gdigrab, from 'desktop':\r\n Duration: N/A, start: 1599021857.538752, bitrate: 9612 kb/s\r\n Stream #0:0: Video: bmp, bgra, 100x100, 9612 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc\r\n**At least one output file must be specified**\r\n"
Which is the contents of proc (and also of proc.communicate). The program crashes right after when trying to resize this message to an image of size 100x100.
I do not want to have an output file. I need to use Python subprocess along with Pipe in order to directly deliver those screen frames to my Python code, no IO required at all.
If I try the following:
cmd = 'D:/Downloads/ffmpeg-20200831-4a11a6f-win64-static/ffmpeg-20200831-4a11a6f-win64-static/bin/ffmpeg.exe -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 100x100 -i desktop -pix_fmt bgr24 -vcodec rawvideo -an -sn -f image2pipe'
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
Then 'frame', inside 'while True', is filled with b''.
Tried using the following libraries with no success, as I couldnt either find how to capture the mouse cursor or capture the screen at all: https://github.com/abhiTronix/vidgear, https://github.com/kkroening/ffmpeg-python
What am I missing? Thank you.
You're missing the - (or pipe: or pipe:1) for the pipe, as in:
ffmpeg.exe -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 100x100 -i desktop -pix_fmt bgr24 -vcodec rawvideo -an -sn -f image2pipe -