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• How to overlay clock with real-time in screen recording using ffmpeg for Sharex open source?

  1 September 2022, by calengineer

  I currently have ShareX and using the following command but the clock with real time is not being added and the video gets considerably cut. A 30 second video turns out to be a 4 second video.

  


  -hide_banner -f dshow -thread_queue_size 1024 -rtbufsize 256M -audio_buffer_size 80 -framerate 30 -i video="screen-capture-recorder":audio="virtual-audio-capturer" -f dshow -i audio="Microphone (HyperX QuadCast S)" -filter_complex amix=inputs=2:duration=longest -vf "drawtext=fontfile=/usr/share/fonts/dejavu/DejaVuSans-Bold.ttf: \ text='%{localtime\:%T}': fontcolor=white@0.8: x=7: y=700" -c:v libx264 -r 30 -preset ultrafast -tune zerolatency -crf 28 -pix_fmt yuv420p -movflags +faststart -c:a aac -ac 2 -b:a 128k -y "output.mp4"


  


• How can I make ffmpeg open my raw video file?

  29 August 2022, by Mandy Weiss

  I'm trying to convert a raw video-only file to some other formats but all I'm getting ffmpeg to produce is a black video.
There are no error messages displayed and this is what ffprobe shows when analyzing the file:

  



  


  ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers
  
 built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
 configuration: —prefix=/usr/local/Cellar/ffmpeg/3.2.2 —enable-shared
 —enable-pthreads —enable-gpl —enable-version3 —enable-hardcoded-tables —enable-avresample —cc=clang —host-cflags= —host-ldflags= —enable-libmp3lame —enable-libx264 —enable-libxvid —enable-opencl —disable-lzma —enable-vda libavutil 55. 34.100 / 55. 34.100 libavcodec 57. 64.101 /
 57. 64.101 libavformat 57. 56.100 / 57. 56.100 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libavresample 3. 1. 0 / 3. 1. 0 libswscale 4. 2.100 / 
 4. 2.100 libswresample 2. 3.100 / 2. 3.100 libpostproc 54. 1.100 / 54. 1.100 Input #0, avi, from '1.avi': Metadata:
 encoder : Lavf54.20.4 Duration: 00:00:57.43, start: 0.000000, bitrate: 83196 kb/s
 Stream #0:0: Video: rawvideo, pal8, 720x480, 83238 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc

  


  



  Other input files can be transcoded to a playable outfile file with the same ffmpeg convert command:

  



  


  ffmpeg -i 1.avi -vcodec h264 output.avi

  


  



  I know the input video is not corrupted because VLC plays it successfully and can even convert it to other formats, but I want to preserve the original one when trying different configurations using ffmpeg.

  



  Thanks in advance for helping!

  


• OpenCV cant open rtsp stream of hikvision cameras?

  25 August 2022, by Smadar

  I'm using hikvision camera, and tried to open the rtsp stream using OpenCV videoCapture with cv2.CAP_FFMPEG, but OpenCV failed to open it.
I open the stream from VLC and it is working fine.
The configuration parameters in the camera dashboard was changed as well. The encoding parameter was changed from H265 to H264, the resolution also has changed to a lower values (1280*720 - the lowest, also tried full HD), the bitrate was changed as well .
I tried to open the stream in two ways -
The first way:

  


  feed = cv2.VideoCapture('rtsp://user:password@IP:554/Streaming/Channels/1', cv2.CAP_FFMPEG)
print('FEED IS OPEN ? ', feed.isOpened())
if feed.isOpened():
    print('IM HERE')
    frame_status, frame = feed.read()
    print(frame_status)
    print(frame.shape[0])


  


  The second way:

  


  cap = cv2.VideoCapture()

cap.open("rtsp://user:password@IP:554/Streaming/Channels/1")
print('IM HERE', cap.isOpened())
while(True):
     # Capture frame-by-frame
    print('IM HERE')
    ret, frame = cap.read()
    print('RET: ', ret)
    print(type(frame))
    print('IM HERE')
    # Our operations on the frame come here
    #gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    print(frame.shape[0])
    # cv2.imshow('frame',ret)

    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()


  


  There is also check ping and there is a connection to the camera.

  


  I will really appreciate any help here in trying of figure this out.
Thank you all.