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• How to stream cv2.VideoWriter frames to and RTSP server

  10 juin 2022, par chasez0r

  Environment : Docker, Ubuntu 20.04, OpenCV 3.5.4, FFmpeg 4.2.4

  


  Im currently reading the output of a cv2.VideoCapture session using the CV_FFMPEG backend and successfully writing that back out in real time to a file using cv2.VideoWriter. The reason I am doing this is to drawing bounding boxes on the input and saving it to a new output.

  


  The problem is I am doing this in a headless environment (Docker container). And I’d like to view what's being written to cv2.VideoWriter in realtime.

  


  I know there are ways to pass my display through using XQuartz for example so I could use cv2.imshow. But what I really want to do is write those frames to an RTSP Server. So not only my host can "watch" but also other hosts could watch too.

  


  After the video is released I can easily stream the video to my RTSP Server using this command.

  


  ffmpeg -re -stream_loop -1 -i output.mp4 -c copy -f rtsp rtsp://rtsp_server_host:8554/stream

  


  Is there anyway to pipe the frames as they come in to the above command ? Can cv2.VideoWriter itself write frames to an RTSP Server ?

  


  Any ideas would be much appreciated ! Thank you.

  


• Line 1 : unknown keyword ' file' ffmpeg

  6 janvier 2024, par pops64

  I am trying to run a concation of multiple files using ffmpeg. Followed directions in docs and getting

  


  Line 1: unknown keyword 'file'
[in#0 @ 000001b09b25e840] Error opening input: Invalid data found when processing input
Error opening input file mylist.txt.
Error opening input files: Invalid data found when processing input


  


  I am not sure what is going wrong. The text file appears to be in the correct format.

  


  $clips = Get-ChildItem -Path Y:\****\Test -File -Filter "*.mp4"
$regex = "(?:\w+)-(?:[i]+-)?(?\d+)-(?\d+)-(?:\w+)"
$groupedScenes = $clips | Group-Object {[regex]::Match($_.Name, $regex).Groups["scene_id"].value}
foreach($scene in $groupedScenes)
{
    $sortedScene = $scene.Group | Sort-Object {[regex]::Match($_.Name, $regex).Groups["clip_id"].value -as [int]} 
    foreach($i in $sortedScene) 
    {
        "file 'Y:\*****\Test\$i'" | Out-File mylist.txt -Encoding utf8 -Append
    }
    .\ffmpeg.exe -f concat -safe 0 -i mylist.txt -map 0 -c:v hevc_amf -quality quality -rc cqp -qp_p 26 -qp_i 26 -c:a aac -b:a 128K -y Y:\*****\Test\Procssed\$sortedScene.mp4
    Remove-Item mylist.txt
}


  


• ffmpeg Grab Single Frame From Youtube Stream

  11 septembre 2021, par Rich_F

  I'm trying to grab a single frame of a streaming video on Youtube.

  


  This is an example

  


  This is the code structure I'm trying to use :

  


  ffmpeg --verbose -i $(youtube-dl -f 96 --no-playlist 'https://www.youtube.com/watch?v=XMs6LnT5mfk') -frames:1 -pred 1 clip1.jpg


  


  Trying to use youtube-dl to grab part of a stream, doesn't seem to work, and is actually throwing an ffmpeg error at me :

  


  [youtube] Q-44KECp-xQ: Downloading webpage
[youtube] Downloading just video Q-44KECp-xQ because of --no-playlist
[youtube] Q-44KECp-xQ: Downloading m3u8 information
[youtube] Q-44KECp-xQ: Downloading MPD manifest
[download] Destination: Ryde Esplanade & Pier, Isle of Wight UK _ Railcam LIVE 2021-09-11 03_25-Q-44KECp-xQ.mp4

ERROR: ffmpeg exited with code -9


  


  How can I achieve this ? I'm open to reworking this approach, or moving to something completely different. Cheers