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• yt-dlp how to download a specific video using timestamps, and limiting the download resolution ?

  30 septembre 2023, par ignacM

  I am running a python program to download a video, this is the command I use :

  


  command = ['powershell.exe ffmpeg',
                   '-ss', str(start),
                   '-i', '$(yt-dlp',
                   '-f', 'bestvideo[ext=webm]',

                   '-g', '"%s")' % (url_base + video_identifier),
                   '-t', str(end - start),
                   '-c:v', 'libx264', '-c:a', 'copy', '%s' % output_filename]

command = ' '.join(command)
output = subprocess.check_output(command, shell=True, stderr=subprocess.STDOUT)


  


  This prints something like
powershell.exe ffmpeg -ss 10 -i $(yt-dlp -f bestvideo[ext=webm] -g "https://www.youtube.com/watch?v=Z15erfLqNKo") -t 10 -c:v libx264 -c:a copy C :\Users...\video.mp4

  


  This works perfectly fine. However, I tried to download a video that had very high resolution (4K) and I want to limit the resolution when downloading. I have found that placing [height<=1080] as so should work :

  &#xA;

  powershell.exe ffmpeg -ss 10 -i $(yt-dlp -f bestvideo[ext=webm][height<=1080] -g "https://www.youtube.com/watch?v=Z15erfLqNKo") -t 10 -c:v libx264 -c:a copy C :\Users...\video.mp4

  &#xA;

  However this does not work for me and gives me the error :&#xA;Error command "" returned non-zero exit status 1.&#xA;Output : b'The system cannot find the file specified.\r\n'

  &#xA;

  I also have noticed that only limiting the resolution does not work for me either :

  &#xA;

  powershell.exe ffmpeg -ss 10 -i $(yt-dlp -f bestvideo[height<=1080] -g "https://www.youtube.com/watch?v=Z15erfLqNKo") -t 10 -c:v libx264 -c:a copy C :\Users...\video.mp4

  &#xA;

  Actually, placing [height<=1080] after bestvideo never works, no matter what I do.

  &#xA;

  What could be the problem ? Or what command can I run to achieve both tasks (limit resolution and download specific timeframe (not whole video and cutting it)) ?

  &#xA;

• How do I send buffer to a virtual camera driver ?

  15 juin 2022, par rvega01

  I'm currently working on a project in a Windows environment where I have a Node.js application that accepts an RTSP video stream from a button click and I would like to stream the video data to a virtual camera driver and have it displayed within Microsoft Teams and Skype. The driver that I'm using and have installed (https://github.com/robot9706/VirtualCameraDriver) mentions that the filter implemented in the driver contains a property with a GUID that I can send buffer to.

  &#xA;

  I was wondering if anyone know of a javascript/node.js library, ffmpeg/gstreamer command, or any solution that comes to mind that can allow me to send video data to that GUID. I have tried outputting the RTSP stream to a videosink with g-streamer but I was unable to specify the display name for the output to be directed to.

  &#xA;

  With ffmpeg, I was able to find the driver info with DShow but I can only implement the driver as an video input and I'm unable to select the driver as an output through DShow. If there is an gstreamer/ffmpeg solution, please let me know as I'm inexperienced with video streaming and I have looked through many threads here but I'm unable to find an answer.

  &#xA;

• Anomalie #3689 : Des messages d’erreurs qui ne semblent pas avoir lieu d’être

  28 mars 2016, par b b

  Je ne sais pas si on peut "simplement" masquer ces erreurs qui n’en sont pas. On pourrait par exemple comparer les deux retours bruts du decideur et retirer les items présents dans les erreurs si ils sont aussi présents dans la liste des succès. À étudier...